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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
Cache.java | 75.5% | 82% | 78.4% | 79.6% |
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/*
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* Copyright (c) 2002-2003 by OpenSymphony
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* All rights reserved.
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*/
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package com.opensymphony.oscache.base;
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import com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache;
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import com.opensymphony.oscache.base.algorithm.LRUCache;
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import com.opensymphony.oscache.base.algorithm.UnlimitedCache;
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import com.opensymphony.oscache.base.events.*;
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import com.opensymphony.oscache.base.persistence.PersistenceListener;
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import com.opensymphony.oscache.util.FastCronParser;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import java.io.Serializable;
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import java.text.ParseException;
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import java.util.*;
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import javax.swing.event.EventListenerList;
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/**
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* Provides an interface to the cache itself. Creating an instance of this class
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* will create a cache that behaves according to its construction parameters.
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* The public API provides methods to manage objects in the cache and configure
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* any cache event listeners.
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*
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* @version $Revision: 1.6 $
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* @author <a href="mailto:mike@atlassian.com">Mike Cannon-Brookes</a>
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* @author <a href="mailto:tgochenour@peregrine.com">Todd Gochenour</a>
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* @author <a href="mailto:fbeauregard@pyxis-tech.com">Francois Beauregard</a>
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* @author <a href="mailto:chris@swebtec.com">Chris Miller</a>
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*/
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public class Cache implements Serializable { |
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/**
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* An event that origininated from within another event.
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*/
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public static final String NESTED_EVENT = "NESTED"; |
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private static transient final Log log = LogFactory.getLog(Cache.class); |
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/**
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* A list of all registered event listeners for this cache.
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*/
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protected EventListenerList listenerList = new EventListenerList(); |
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/**
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* The actual cache map. This is where the cached objects are held.
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*/
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private AbstractConcurrentReadCache cacheMap = null; |
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/**
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* Date of last complete cache flush.
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*/
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private Date flushDateTime = null; |
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/**
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* A set that holds keys of cache entries that are currently being built.
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* The cache checks against this map when a stale entry is requested.
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* If the requested key is in here, we know the entry is currently being
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* built by another thread and hence we can either block and wait or serve
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* the stale entry (depending on whether cache blocking is enabled or not).
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* <p>
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* We need to isolate these here since the actual CacheEntry
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* objects may not normally be held in memory at all (eg, if no
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* memory cache is configured).
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*/
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private Map updateStates = new HashMap(); |
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/**
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* Indicates whether the cache blocks requests until new content has
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* been generated or just serves stale content instead.
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*/
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private boolean blocking = false; |
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/**
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* Create a new Cache
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*
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* @param useMemoryCaching Specify if the memory caching is going to be used
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* @param unlimitedDiskCache Specify if the disk caching is unlimited
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*/
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84 | 9 |
public Cache(boolean useMemoryCaching, boolean unlimitedDiskCache) { |
85 | 9 |
this(useMemoryCaching, unlimitedDiskCache, false, null, 0); |
86 |
} |
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/**
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* Create a new Cache.
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*
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* If a valid algorithm class is specified, it will be used for this cache.
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* Otherwise if a capacity is specified, it will use LRUCache.
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* If no algorithm or capacity is specified UnlimitedCache is used.
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*
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* @see com.opensymphony.oscache.base.algorithm.LRUCache
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* @see com.opensymphony.oscache.base.algorithm.UnlimitedCache
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* @param useMemoryCaching Specify if the memory caching is going to be used
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* @param unlimitedDiskCache Specify if the disk caching is unlimited
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* @param blocking This parameter takes effect when a cache entry has
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* just expired and several simultaneous requests try to retrieve it. While
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* one request is rebuilding the content, the other requests will either
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* block and wait for the new content (<code>blocking == true</code>) or
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* instead receive a copy of the stale content so they don't have to wait
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* (<code>blocking == false</code>). the default is <code>false</code>,
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* which provides better performance but at the expense of slightly stale
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* data being served.
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* @param algorithmClass The class implementing the desired algorithm
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* @param capacity The capacity
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*/
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110 | 54 |
public Cache(boolean useMemoryCaching, boolean unlimitedDiskCache, boolean blocking, String algorithmClass, int capacity) { |
111 |
// Instantiate the algo class if valid
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112 | 54 |
if (((algorithmClass != null) && (algorithmClass.length() > 0)) && (capacity > 0)) { |
113 | 0 |
try {
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114 | 0 |
cacheMap = (AbstractConcurrentReadCache) Class.forName(algorithmClass).newInstance(); |
115 | 0 |
cacheMap.setMaxEntries(capacity); |
116 |
} catch (Exception e) {
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117 | 0 |
log.error("Invalid class name for cache algorithm class. " + e.toString());
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} |
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} |
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121 | 54 |
if (cacheMap == null) { |
122 |
// If we have a capacity, use LRU cache otherwise use unlimited Cache
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123 | 54 |
if (capacity > 0) {
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124 | 28 |
cacheMap = new LRUCache(capacity);
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} else {
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126 | 26 |
cacheMap = new UnlimitedCache();
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} |
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} |
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130 | 54 |
cacheMap.setUnlimitedDiskCache(unlimitedDiskCache); |
131 | 54 |
cacheMap.setMemoryCaching(useMemoryCaching); |
132 |
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133 | 54 |
this.blocking = blocking;
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} |
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/**
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* Allows the capacity of the cache to be altered dynamically. Note that
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* some cache implementations may choose to ignore this setting (eg the
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* {@link UnlimitedCache} ignores this call).
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*
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* @param capacity the maximum number of items to hold in the cache.
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*/
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143 | 0 |
public void setCapacity(int capacity) { |
144 | 0 |
cacheMap.setMaxEntries(capacity); |
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} |
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/**
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* Checks if the cache was flushed more recently than the CacheEntry provided.
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* Used to determine whether to refresh the particular CacheEntry.
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*
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* @param cacheEntry The cache entry which we're seeing whether to refresh
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* @return Whether or not the cache has been flushed more recently than this cache entry was updated.
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*/
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154 | 4579 |
public boolean isFlushed(CacheEntry cacheEntry) { |
155 | 4579 |
if (flushDateTime != null) { |
156 | 0 |
long lastUpdate = cacheEntry.getLastUpdate();
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158 | 0 |
return (flushDateTime.getTime() >= lastUpdate);
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} else {
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160 | 4579 |
return false; |
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} |
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} |
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/**
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* Retrieve an object from the cache specifying its key.
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*
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* @param key Key of the object in the cache.
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*
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* @return The object from cache
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*
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* @throws NeedsRefreshException Thrown when the object either
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* doesn't exist, or exists but is stale. When this exception occurs,
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* the CacheEntry corresponding to the supplied key will be locked
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* and other threads requesting this entry will potentially be blocked
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* until the caller repopulates the cache. If the caller choses not
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* to repopulate the cache, they <em>must</em> instead call
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* {@link #cancelUpdate(String)}.
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*/
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179 | 0 |
public Object getFromCache(String key) throws NeedsRefreshException { |
180 | 0 |
return getFromCache(key, CacheEntry.INDEFINITE_EXPIRY, null); |
181 |
} |
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/**
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* Retrieve an object from the cache specifying its key.
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*
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* @param key Key of the object in the cache.
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* @param refreshPeriod How long before the object needs refresh. To
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* allow the object to stay in the cache indefinitely, supply a value
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* of {@link CacheEntry#INDEFINITE_EXPIRY}.
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*
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* @return The object from cache
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*
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* @throws NeedsRefreshException Thrown when the object either
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* doesn't exist, or exists but is stale. When this exception occurs,
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* the CacheEntry corresponding to the supplied key will be locked
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* and other threads requesting this entry will potentially be blocked
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* until the caller repopulates the cache. If the caller choses not
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* to repopulate the cache, they <em>must</em> instead call
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* {@link #cancelUpdate(String)}.
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*/
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201 | 4701 |
public Object getFromCache(String key, int refreshPeriod) throws NeedsRefreshException { |
202 | 4701 |
return getFromCache(key, refreshPeriod, null); |
203 |
} |
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/**
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* Retrieve an object from the cache specifying its key.
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*
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* @param key Key of the object in the cache.
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* @param refreshPeriod How long before the object needs refresh. To
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* allow the object to stay in the cache indefinitely, supply a value
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* of {@link CacheEntry#INDEFINITE_EXPIRY}.
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* @param cronExpiry A cron expression that specifies fixed date(s)
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* and/or time(s) that this cache entry should
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* expire on.
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*
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* @return The object from cache
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*
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* @throws NeedsRefreshException Thrown when the object either
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* doesn't exist, or exists but is stale. When this exception occurs,
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* the CacheEntry corresponding to the supplied key will be locked
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* and other threads requesting this entry will potentially be blocked
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* until the caller repopulates the cache. If the caller choses not
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* to repopulate the cache, they <em>must</em> instead call
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* {@link #cancelUpdate(String)}.
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*/
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226 | 4701 |
public Object getFromCache(String key, int refreshPeriod, String cronExpiry) throws NeedsRefreshException { |
227 | 4701 |
CacheEntry cacheEntry = this.getCacheEntry(key, null, null); |
228 |
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229 | 4692 |
Object content = cacheEntry.getContent(); |
230 | 4692 |
CacheMapAccessEventType accessEventType = CacheMapAccessEventType.HIT; |
231 |
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232 | 4692 |
boolean reload = false; |
233 |
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// Check if this entry has expired or has not yet been added to the cache. If
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// so, we need to decide whether to block, serve stale content or throw a
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// NeedsRefreshException
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237 | 4692 |
if (this.isStale(cacheEntry, refreshPeriod, cronExpiry)) { |
238 | 113 |
EntryUpdateState updateState = getUpdateState(key); |
239 |
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240 | 113 |
synchronized (updateState) {
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241 | 113 |
if (updateState.isAwaitingUpdate() || updateState.isCancelled()) {
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242 |
// No one else is currently updating this entry - grab ownership
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243 | 98 |
updateState.startUpdate(); |
244 |
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245 | 98 |
if (cacheEntry.isNew()) {
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246 | 20 |
accessEventType = CacheMapAccessEventType.MISS; |
247 |
} else {
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248 | 78 |
accessEventType = CacheMapAccessEventType.STALE_HIT; |
249 |
} |
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250 | 15 |
} else if (updateState.isUpdating()) { |
251 |
// Another thread is already updating the cache. We block if this
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// is a new entry, or blocking mode is enabled. Either putInCache()
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// or cancelUpdate() can cause this thread to resume.
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254 | 15 |
if (cacheEntry.isNew() || blocking) {
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255 | 12 |
do {
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256 | 12 |
try {
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257 | 12 |
updateState.wait(); |
258 |
} catch (InterruptedException e) {
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259 |
} |
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260 | 12 |
} while (updateState.isUpdating());
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261 |
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262 | 12 |
if (updateState.isCancelled()) {
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263 |
// The updating thread cancelled the update, let this one have a go.
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264 | 3 |
updateState.startUpdate(); |
265 |
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266 |
// We put the updateState object back into the updateStates map so
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// any remaining threads waiting on this cache entry will be notified
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// once this thread has done its thing (either updated the cache or
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// cancelled the update). Without this code they'll get left hanging...
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270 | 3 |
synchronized (updateStates) {
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271 | 3 |
updateStates.put(key, updateState); |
272 |
} |
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273 |
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274 | 3 |
if (cacheEntry.isNew()) {
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275 | 3 |
accessEventType = CacheMapAccessEventType.MISS; |
276 |
} else {
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277 | 0 |
accessEventType = CacheMapAccessEventType.STALE_HIT; |
278 |
} |
|
279 | 9 |
} else if (updateState.isComplete()) { |
280 | 9 |
reload = true;
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281 |
} else {
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282 | 0 |
log.error("Invalid update state for cache entry " + key);
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283 |
} |
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284 |
} |
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285 |
} else {
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286 | 0 |
reload = true;
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287 |
} |
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288 |
} |
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289 |
} |
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290 |
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291 |
// If reload is true then another thread must have successfully rebuilt the cache entry
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292 | 4692 |
if (reload) {
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293 | 9 |
cacheEntry = (CacheEntry) cacheMap.get(key); |
294 |
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295 | 9 |
if (cacheEntry != null) { |
296 | 9 |
content = cacheEntry.getContent(); |
297 |
} else {
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298 | 0 |
log.error("Could not reload cache entry after waiting for it to be rebuilt");
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299 |
} |
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300 |
} |
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301 |
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302 | 4692 |
dispatchCacheMapAccessEvent(accessEventType, cacheEntry, null);
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303 |
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304 |
// If we didn't end up getting a hit then we need to throw a NRE
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305 | 4692 |
if (accessEventType != CacheMapAccessEventType.HIT) {
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306 | 101 |
throw new NeedsRefreshException(content); |
307 |
} |
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308 |
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309 | 4591 |
return content;
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310 |
} |
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311 |
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312 |
/**
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313 |
* Set the listener to use for data persistence. Only one
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314 |
* <code>PersistenceListener</code> can be configured per cache.
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315 |
*
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316 |
* @param listener The implementation of a persistance listener
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317 |
*/
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318 | 28 |
public void setPersistenceListener(PersistenceListener listener) { |
319 | 28 |
cacheMap.setPersistenceListener(listener); |
320 |
} |
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321 |
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322 |
/**
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323 |
* Retrieves the currently configured <code>PersistenceListener</code>.
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324 |
*
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325 |
* @return the cache's <code>PersistenceListener</code>, or <code>null</code>
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326 |
* if no listener is configured.
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327 |
*/
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328 | 0 |
public PersistenceListener getPersistenceListener() {
|
329 | 0 |
return cacheMap.getPersistenceListener();
|
330 |
} |
|
331 |
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|
332 |
/**
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|
333 |
* Register a listener for Cache events. The listener must implement
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334 |
* one of the child interfaces of the {@link CacheEventListener} interface.
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335 |
*
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336 |
* @param listener The object that listens to events.
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337 |
*/
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338 | 72 |
public void addCacheEventListener(CacheEventListener listener, Class clazz) { |
339 | 72 |
if (CacheEventListener.class.isAssignableFrom(clazz)) { |
340 | 72 |
listenerList.add(clazz, listener); |
341 |
} else {
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342 | 0 |
log.error("The class '" + clazz.getName() + "' is not a CacheEventListener. Ignoring this listener."); |
343 |
} |
|
344 |
} |
|
345 |
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|
346 |
/**
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|
347 |
* Cancels any pending update for this cache entry. This should <em>only</em>
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|
348 |
* be called by the thread that is responsible for performing the update ie
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|
349 |
* the thread that received the original {@link NeedsRefreshException}.<p/>
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|
350 |
* If a cache entry is not updated (via {@link #putInCache} and this method is
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|
351 |
* not called to let OSCache know the update will not be forthcoming, subsequent
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352 |
* requests for this cache entry will either block indefinitely (if this is a new
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353 |
* cache entry or cache.blocking=true), or forever get served stale content. Note
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354 |
* however that there is no harm in cancelling an update on a key that either
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|
355 |
* does not exist or is not currently being updated.
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|
356 |
*
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|
357 |
* @param key The key for the cache entry in question.
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|
358 |
*/
|
|
359 | 84 |
public void cancelUpdate(String key) { |
360 | 84 |
EntryUpdateState state; |
361 |
|
|
362 | 84 |
if (key != null) { |
363 | 84 |
synchronized (updateStates) {
|
364 | 84 |
state = (EntryUpdateState) updateStates.remove(key); |
365 |
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|
366 | 84 |
if (state != null) { |
367 | 84 |
synchronized (state) {
|
368 | 84 |
state.cancelUpdate(); |
369 | 84 |
state.notify(); |
370 |
} |
|
371 |
} |
|
372 |
} |
|
373 |
} |
|
374 |
} |
|
375 |
|
|
376 |
/**
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|
377 |
* Flush all entries in the cache on the given date/time.
|
|
378 |
*
|
|
379 |
* @param date The date at which all cache entries will be flushed.
|
|
380 |
*/
|
|
381 | 0 |
public void flushAll(Date date) { |
382 | 0 |
flushAll(date, null);
|
383 |
} |
|
384 |
|
|
385 |
/**
|
|
386 |
* Flush all entries in the cache on the given date/time.
|
|
387 |
*
|
|
388 |
* @param date The date at which all cache entries will be flushed.
|
|
389 |
* @param origin The origin of this flush request (optional)
|
|
390 |
*/
|
|
391 | 0 |
public void flushAll(Date date, String origin) { |
392 | 0 |
flushDateTime = date; |
393 | 0 |
dispatchCachewideEvent(CachewideEventType.CACHE_FLUSHED, date, origin); |
394 |
} |
|
395 |
|
|
396 |
/**
|
|
397 |
* Flush the cache entry (if any) that corresponds to the cache key supplied.
|
|
398 |
* This call will flush the entry from the cache and remove the references to
|
|
399 |
* it from any cache groups that it is a member of. On completion of the flush,
|
|
400 |
* a <tt>CacheEntryEventType.ENTRY_FLUSHED</tt> event is fired.
|
|
401 |
*
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|
402 |
* @param key The key of the entry to flush
|
|
403 |
*/
|
|
404 | 360 |
public void flushEntry(String key) { |
405 | 360 |
flushEntry(key, null);
|
406 |
} |
|
407 |
|
|
408 |
/**
|
|
409 |
* Flush the cache entry (if any) that corresponds to the cache key supplied.
|
|
410 |
* This call will mark the cache entry as flushed so that the next access
|
|
411 |
* to it will cause a {@link NeedsRefreshException}. On completion of the
|
|
412 |
* flush, a <tt>CacheEntryEventType.ENTRY_FLUSHED</tt> event is fired.
|
|
413 |
*
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|
414 |
* @param key The key of the entry to flush
|
|
415 |
* @param origin The origin of this flush request (optional)
|
|
416 |
*/
|
|
417 | 360 |
public void flushEntry(String key, String origin) { |
418 | 360 |
flushEntry(getCacheEntry(key, null, origin), origin);
|
419 |
} |
|
420 |
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|
421 |
/**
|
|
422 |
* Flushes all objects that belong to the supplied group. On completion
|
|
423 |
* this method fires a <tt>CacheEntryEventType.GROUP_FLUSHED</tt> event.
|
|
424 |
*
|
|
425 |
* @param group The group to flush
|
|
426 |
*/
|
|
427 | 24 |
public void flushGroup(String group) { |
428 | 24 |
flushGroup(group, null);
|
429 |
} |
|
430 |
|
|
431 |
/**
|
|
432 |
* Flushes all unexpired objects that belong to the supplied group. On
|
|
433 |
* completion this method fires a <tt>CacheEntryEventType.GROUP_FLUSHED</tt>
|
|
434 |
* event.
|
|
435 |
*
|
|
436 |
* @param group The group to flush
|
|
437 |
* @param origin The origin of this flush event (optional)
|
|
438 |
*/
|
|
439 | 24 |
public void flushGroup(String group, String origin) { |
440 |
// Flush all objects in the group
|
|
441 | 24 |
Set groupEntries = cacheMap.getGroup(group); |
442 |
|
|
443 | 24 |
if (groupEntries != null) { |
444 | 23 |
Iterator itr = groupEntries.iterator(); |
445 | 23 |
String key; |
446 | 23 |
CacheEntry entry; |
447 |
|
|
448 | 23 |
while (itr.hasNext()) {
|
449 | 92 |
key = (String) itr.next(); |
450 | 92 |
entry = (CacheEntry) cacheMap.get(key); |
451 |
|
|
452 | 92 |
if ((entry != null) && !entry.needsRefresh(CacheEntry.INDEFINITE_EXPIRY)) { |
453 | 39 |
flushEntry(entry, NESTED_EVENT); |
454 |
} |
|
455 |
} |
|
456 |
} |
|
457 |
|
|
458 | 24 |
dispatchCacheGroupEvent(CacheEntryEventType.GROUP_FLUSHED, group, origin); |
459 |
} |
|
460 |
|
|
461 |
/**
|
|
462 |
* Flush all entries with keys that match a given pattern
|
|
463 |
*
|
|
464 |
* @param pattern The key must contain this given value
|
|
465 |
* @deprecated For performance and flexibility reasons it is preferable to
|
|
466 |
* store cache entries in groups and use the {@link #flushGroup(String)} method
|
|
467 |
* instead of relying on pattern flushing.
|
|
468 |
*/
|
|
469 | 30 |
public void flushPattern(String pattern) { |
470 | 30 |
flushPattern(pattern, null);
|
471 |
} |
|
472 |
|
|
473 |
/**
|
|
474 |
* Flush all entries with keys that match a given pattern
|
|
475 |
*
|
|
476 |
* @param pattern The key must contain this given value
|
|
477 |
* @param origin The origin of this flush request
|
|
478 |
* @deprecated For performance and flexibility reasons it is preferable to
|
|
479 |
* store cache entries in groups and use the {@link #flushGroup(String, String)}
|
|
480 |
* method instead of relying on pattern flushing.
|
|
481 |
*/
|
|
482 | 30 |
public void flushPattern(String pattern, String origin) { |
483 |
// Check the pattern
|
|
484 | 30 |
if ((pattern != null) && (pattern.length() > 0)) { |
485 | 18 |
String key = null;
|
486 | 18 |
CacheEntry entry = null;
|
487 | 18 |
Iterator itr = cacheMap.keySet().iterator(); |
488 |
|
|
489 | 18 |
while (itr.hasNext()) {
|
490 | 54 |
key = (String) itr.next(); |
491 |
|
|
492 | 54 |
if (key.indexOf(pattern) >= 0) {
|
493 | 6 |
entry = (CacheEntry) cacheMap.get(key); |
494 |
|
|
495 | 6 |
if (entry != null) { |
496 | 6 |
flushEntry(entry, origin); |
497 |
} |
|
498 |
} |
|
499 |
} |
|
500 |
|
|
501 | 18 |
dispatchCachePatternEvent(CacheEntryEventType.PATTERN_FLUSHED, pattern, origin); |
502 |
} else {
|
|
503 |
// Empty pattern, nothing to do
|
|
504 |
} |
|
505 |
} |
|
506 |
|
|
507 |
/**
|
|
508 |
* Put an object in the cache specifying the key to use.
|
|
509 |
*
|
|
510 |
* @param key Key of the object in the cache.
|
|
511 |
* @param content The object to cache.
|
|
512 |
*/
|
|
513 | 6 |
public void putInCache(String key, Object content) { |
514 | 6 |
putInCache(key, content, null, null, null); |
515 |
} |
|
516 |
|
|
517 |
/**
|
|
518 |
* Put an object in the cache specifying the key and refresh policy to use.
|
|
519 |
*
|
|
520 |
* @param key Key of the object in the cache.
|
|
521 |
* @param content The object to cache.
|
|
522 |
* @param policy Object that implements refresh policy logic
|
|
523 |
*/
|
|
524 | 4556 |
public void putInCache(String key, Object content, EntryRefreshPolicy policy) { |
525 | 4556 |
putInCache(key, content, null, policy, null); |
526 |
} |
|
527 |
|
|
528 |
/**
|
|
529 |
* Put in object into the cache, specifying both the key to use and the
|
|
530 |
* cache groups the object belongs to.
|
|
531 |
*
|
|
532 |
* @param key Key of the object in the cache
|
|
533 |
* @param content The object to cache
|
|
534 |
* @param groups The cache groups to add the object to
|
|
535 |
*/
|
|
536 | 54 |
public void putInCache(String key, Object content, String[] groups) { |
537 | 54 |
putInCache(key, content, groups, null, null); |
538 |
} |
|
539 |
|
|
540 |
/**
|
|
541 |
* Put an object into the cache specifying both the key to use and the
|
|
542 |
* cache groups the object belongs to.
|
|
543 |
*
|
|
544 |
* @param key Key of the object in the cache
|
|
545 |
* @param groups The cache groups to add the object to
|
|
546 |
* @param content The object to cache
|
|
547 |
* @param policy Object that implements the refresh policy logic
|
|
548 |
*/
|
|
549 | 4616 |
public void putInCache(String key, Object content, String[] groups, EntryRefreshPolicy policy, String origin) { |
550 | 4616 |
CacheEntry cacheEntry = this.getCacheEntry(key, policy, origin);
|
551 | 4613 |
boolean isNewEntry = cacheEntry.isNew();
|
552 | 4613 |
cacheEntry.setContent(content); |
553 | 4613 |
cacheEntry.setGroups(groups); |
554 | 4613 |
cacheMap.put(key, cacheEntry); |
555 |
|
|
556 |
// Signal to any threads waiting on this update that it's now ready for them
|
|
557 |
// in the cache!
|
|
558 | 4613 |
completeUpdate(key); |
559 |
|
|
560 | 4613 |
CacheEntryEvent event = new CacheEntryEvent(this, cacheEntry, origin); |
561 |
|
|
562 | 4613 |
if (isNewEntry) {
|
563 | 162 |
dispatchCacheEntryEvent(CacheEntryEventType.ENTRY_ADDED, event); |
564 |
} else {
|
|
565 | 4451 |
dispatchCacheEntryEvent(CacheEntryEventType.ENTRY_UPDATED, event); |
566 |
} |
|
567 |
} |
|
568 |
|
|
569 |
/**
|
|
570 |
* Unregister a listener for Cache events.
|
|
571 |
*
|
|
572 |
* @param listener The object that currently listens to events.
|
|
573 |
*/
|
|
574 | 72 |
public void removeCacheEventListener(CacheEventListener listener, Class clazz) { |
575 | 72 |
listenerList.remove(clazz, listener); |
576 |
} |
|
577 |
|
|
578 |
/**
|
|
579 |
* Get an entry from this cache or create one if it doesn't exist.
|
|
580 |
*
|
|
581 |
* @param key The key of the cache entry
|
|
582 |
* @param policy Object that implements refresh policy logic
|
|
583 |
* @param origin The origin of request (optional)
|
|
584 |
* @return CacheEntry for the specified key.
|
|
585 |
*/
|
|
586 | 9677 |
protected CacheEntry getCacheEntry(String key, EntryRefreshPolicy policy, String origin) {
|
587 | 9677 |
CacheEntry cacheEntry = null;
|
588 |
|
|
589 |
// Verify that the key is valid
|
|
590 | 9677 |
if ((key == null) || (key.length() == 0)) { |
591 | 12 |
throw new IllegalArgumentException("getCacheEntry called with an empty or null key"); |
592 |
} |
|
593 |
|
|
594 | 9665 |
cacheEntry = (CacheEntry) cacheMap.get(key); |
595 |
|
|
596 |
// if the cache entry does not exist, create a new one
|
|
597 | 9665 |
if (cacheEntry == null) { |
598 | 195 |
if (log.isDebugEnabled()) {
|
599 | 195 |
log.debug("No cache entry exists for key='" + key + "', creating"); |
600 |
} |
|
601 |
|
|
602 | 195 |
cacheEntry = new CacheEntry(key, policy);
|
603 |
} |
|
604 |
|
|
605 | 9665 |
return cacheEntry;
|
606 |
} |
|
607 |
|
|
608 |
/**
|
|
609 |
* Indicates whether or not the cache entry is stale.
|
|
610 |
*
|
|
611 |
* @param cacheEntry The cache entry to test the freshness of.
|
|
612 |
* @param refreshPeriod The maximum allowable age of the entry, in seconds.
|
|
613 |
* @param cronExpiry A cron expression specifying absolute date(s) and/or time(s)
|
|
614 |
* that the cache entry should expire at. If the cache entry was refreshed prior to
|
|
615 |
* the most recent match for the cron expression, the entry will be considered stale.
|
|
616 |
*
|
|
617 |
* @return <code>true</code> if the entry is stale, <code>false</code> otherwise.
|
|
618 |
*/
|
|
619 | 4692 |
protected boolean isStale(CacheEntry cacheEntry, int refreshPeriod, String cronExpiry) { |
620 | 4692 |
boolean result = cacheEntry.needsRefresh(refreshPeriod) || isFlushed(cacheEntry);
|
621 |
|
|
622 | 4692 |
if ((cronExpiry != null) && (cronExpiry.length() > 0)) { |
623 | 0 |
try {
|
624 | 0 |
FastCronParser parser = new FastCronParser(cronExpiry);
|
625 | 0 |
result = result || parser.hasMoreRecentMatch(cacheEntry.getLastUpdate()); |
626 |
} catch (ParseException e) {
|
|
627 | 0 |
log.warn(e); |
628 |
} |
|
629 |
} |
|
630 |
|
|
631 | 4692 |
return result;
|
632 |
} |
|
633 |
|
|
634 |
/**
|
|
635 |
* Get the updating cache entry from the update map. If one is not found,
|
|
636 |
* create a new one (with state {@link EntryUpdateState#NOT_YET_UPDATING})
|
|
637 |
* and add it to the map.
|
|
638 |
*
|
|
639 |
* @param key The cache key for this entry
|
|
640 |
*
|
|
641 |
* @return the CacheEntry that was found (or added to) the updatingEntries
|
|
642 |
* map.
|
|
643 |
*/
|
|
644 | 113 |
protected EntryUpdateState getUpdateState(String key) {
|
645 | 113 |
EntryUpdateState updateState; |
646 |
|
|
647 | 113 |
synchronized (updateStates) {
|
648 |
// Try to find the matching state object in the updating entry map.
|
|
649 | 113 |
updateState = (EntryUpdateState) updateStates.get(key); |
650 |
|
|
651 | 113 |
if (updateState == null) { |
652 |
// It's not there so add it.
|
|
653 | 98 |
updateState = new EntryUpdateState();
|
654 | 98 |
updateStates.put(key, updateState); |
655 |
} |
|
656 |
} |
|
657 |
|
|
658 | 113 |
return updateState;
|
659 |
} |
|
660 |
|
|
661 |
/**
|
|
662 |
* Completely clears the cache.
|
|
663 |
*/
|
|
664 | 9 |
protected void clear() { |
665 | 9 |
cacheMap.clear(); |
666 |
} |
|
667 |
|
|
668 |
/**
|
|
669 |
* Removes the update state for the specified key and notifies any other
|
|
670 |
* threads that are waiting on this object. This is called automatically
|
|
671 |
* by the {@link #putInCache} method.
|
|
672 |
*
|
|
673 |
* @param key The cache key that is no longer being updated.
|
|
674 |
*/
|
|
675 | 4613 |
protected void completeUpdate(String key) { |
676 | 4613 |
EntryUpdateState state; |
677 |
|
|
678 | 4613 |
synchronized (updateStates) {
|
679 | 4613 |
state = (EntryUpdateState) updateStates.remove(key); |
680 |
|
|
681 | 4613 |
if (state != null) { |
682 | 17 |
synchronized (state) {
|
683 | 17 |
state.completeUpdate(); |
684 | 17 |
state.notifyAll(); |
685 |
} |
|
686 |
} |
|
687 |
} |
|
688 |
} |
|
689 |
|
|
690 |
/**
|
|
691 |
* Completely removes a cache entry from the cache and its associated cache
|
|
692 |
* groups.
|
|
693 |
*
|
|
694 |
* @param key The key of the entry to remove.
|
|
695 |
*/
|
|
696 | 0 |
protected void removeEntry(String key) { |
697 | 0 |
removeEntry(key, null);
|
698 |
} |
|
699 |
|
|
700 |
/**
|
|
701 |
* Completely removes a cache entry from the cache and its associated cache
|
|
702 |
* groups.
|
|
703 |
*
|
|
704 |
* @param key The key of the entry to remove.
|
|
705 |
* @param origin The origin of this remove request.
|
|
706 |
*/
|
|
707 | 0 |
protected void removeEntry(String key, String origin) { |
708 | 0 |
CacheEntry cacheEntry = (CacheEntry) cacheMap.get(key); |
709 | 0 |
cacheMap.remove(key); |
710 |
|
|
711 | 0 |
CacheEntryEvent event = new CacheEntryEvent(this, cacheEntry, origin); |
712 | 0 |
dispatchCacheEntryEvent(CacheEntryEventType.ENTRY_REMOVED, event); |
713 |
} |
|
714 |
|
|
715 |
/**
|
|
716 |
* Dispatch a cache entry event to all registered listeners.
|
|
717 |
*
|
|
718 |
* @param eventType The type of event (used to branch on the proper method)
|
|
719 |
* @param event The event that was fired
|
|
720 |
*/
|
|
721 | 5014 |
private void dispatchCacheEntryEvent(CacheEntryEventType eventType, CacheEntryEvent event) { |
722 |
// Guaranteed to return a non-null array
|
|
723 | 5014 |
Object[] listeners = listenerList.getListenerList(); |
724 |
|
|
725 |
// Process the listeners last to first, notifying
|
|
726 |
// those that are interested in this event
|
|
727 | 5014 |
for (int i = listeners.length - 2; i >= 0; i -= 2) { |
728 | 246 |
if (listeners[i] == CacheEntryEventListener.class) { |
729 | 123 |
if (eventType.equals(CacheEntryEventType.ENTRY_ADDED)) {
|
730 | 50 |
((CacheEntryEventListener) listeners[i + 1]).cacheEntryAdded(event); |
731 | 73 |
} else if (eventType.equals(CacheEntryEventType.ENTRY_UPDATED)) { |
732 | 31 |
((CacheEntryEventListener) listeners[i + 1]).cacheEntryUpdated(event); |
733 | 42 |
} else if (eventType.equals(CacheEntryEventType.ENTRY_FLUSHED)) { |
734 | 42 |
((CacheEntryEventListener) listeners[i + 1]).cacheEntryFlushed(event); |
735 | 0 |
} else if (eventType.equals(CacheEntryEventType.ENTRY_REMOVED)) { |
736 | 0 |
((CacheEntryEventListener) listeners[i + 1]).cacheEntryRemoved(event); |
737 |
} |
|
738 |
} |
|
739 |
} |
|
740 |
} |
|
741 |
|
|
742 |
/**
|
|
743 |
* Dispatch a cache group event to all registered listeners.
|
|
744 |
*
|
|
745 |
* @param eventType The type of event (this is used to branch to the correct method handler)
|
|
746 |
* @param group The cache group that the event applies to
|
|
747 |
* @param origin The origin of this event (optional)
|
|
748 |
*/
|
|
749 | 24 |
private void dispatchCacheGroupEvent(CacheEntryEventType eventType, String group, String origin) { |
750 | 24 |
CacheGroupEvent event = new CacheGroupEvent(this, group, origin); |
751 |
|
|
752 |
// Guaranteed to return a non-null array
|
|
753 | 24 |
Object[] listeners = listenerList.getListenerList(); |
754 |
|
|
755 |
// Process the listeners last to first, notifying
|
|
756 |
// those that are interested in this event
|
|
757 | 24 |
for (int i = listeners.length - 2; i >= 0; i -= 2) { |
758 | 48 |
if (listeners[i] == CacheEntryEventListener.class) { |
759 | 24 |
if (eventType.equals(CacheEntryEventType.GROUP_FLUSHED)) {
|
760 | 24 |
((CacheEntryEventListener) listeners[i + 1]).cacheGroupFlushed(event); |
761 |
} |
|
762 |
} |
|
763 |
} |
|
764 |
} |
|
765 |
|
|
766 |
/**
|
|
767 |
* Dispatch a cache map access event to all registered listeners.
|
|
768 |
*
|
|
769 |
* @param eventType The type of event
|
|
770 |
* @param entry The entry that was affected.
|
|
771 |
* @param origin The origin of this event (optional)
|
|
772 |
*/
|
|
773 | 4692 |
private void dispatchCacheMapAccessEvent(CacheMapAccessEventType eventType, CacheEntry entry, String origin) { |
774 | 4692 |
CacheMapAccessEvent event = new CacheMapAccessEvent(eventType, entry, origin);
|
775 |
|
|
776 |
// Guaranteed to return a non-null array
|
|
777 | 4692 |
Object[] listeners = listenerList.getListenerList(); |
778 |
|
|
779 |
// Process the listeners last to first, notifying
|
|
780 |
// those that are interested in this event
|
|
781 | 4692 |
for (int i = listeners.length - 2; i >= 0; i -= 2) { |
782 | 270 |
if (listeners[i] == CacheMapAccessEventListener.class) { |
783 | 135 |
((CacheMapAccessEventListener) listeners[i + 1]).accessed(event); |
784 |
} |
|
785 |
} |
|
786 |
} |
|
787 |
|
|
788 |
/**
|
|
789 |
* Dispatch a cache pattern event to all registered listeners.
|
|
790 |
*
|
|
791 |
* @param eventType The type of event (this is used to branch to the correct method handler)
|
|
792 |
* @param pattern The cache pattern that the event applies to
|
|
793 |
* @param origin The origin of this event (optional)
|
|
794 |
*/
|
|
795 | 18 |
private void dispatchCachePatternEvent(CacheEntryEventType eventType, String pattern, String origin) { |
796 | 18 |
CachePatternEvent event = new CachePatternEvent(this, pattern, origin); |
797 |
|
|
798 |
// Guaranteed to return a non-null array
|
|
799 | 18 |
Object[] listeners = listenerList.getListenerList(); |
800 |
|
|
801 |
// Process the listeners last to first, notifying
|
|
802 |
// those that are interested in this event
|
|
803 | 18 |
for (int i = listeners.length - 2; i >= 0; i -= 2) { |
804 | 24 |
if (listeners[i] == CacheEntryEventListener.class) { |
805 | 12 |
if (eventType.equals(CacheEntryEventType.PATTERN_FLUSHED)) {
|
806 | 12 |
((CacheEntryEventListener) listeners[i + 1]).cachePatternFlushed(event); |
807 |
} |
|
808 |
} |
|
809 |
} |
|
810 |
} |
|
811 |
|
|
812 |
/**
|
|
813 |
* Dispatches a cache-wide event to all registered listeners.
|
|
814 |
*
|
|
815 |
* @param eventType The type of event (this is used to branch to the correct method handler)
|
|
816 |
* @param origin The origin of this event (optional)
|
|
817 |
*/
|
|
818 | 0 |
private void dispatchCachewideEvent(CachewideEventType eventType, Date date, String origin) { |
819 | 0 |
CachewideEvent event = new CachewideEvent(this, date, origin); |
820 |
|
|
821 |
// Guaranteed to return a non-null array
|
|
822 | 0 |
Object[] listeners = listenerList.getListenerList(); |
823 |
|
|
824 |
// Process the listeners last to first, notifying
|
|
825 |
// those that are interested in this event
|
|
826 | 0 |
for (int i = listeners.length - 2; i >= 0; i -= 2) { |
827 | 0 |
if (listeners[i] == CacheEntryEventListener.class) { |
828 | 0 |
if (eventType.equals(CachewideEventType.CACHE_FLUSHED)) {
|
829 | 0 |
((CacheEntryEventListener) listeners[i + 1]).cacheFlushed(event); |
830 |
} |
|
831 |
} |
|
832 |
} |
|
833 |
} |
|
834 |
|
|
835 |
/**
|
|
836 |
* Flush a cache entry. On completion of the flush, a
|
|
837 |
* <tt>CacheEntryEventType.ENTRY_FLUSHED</tt> event is fired.
|
|
838 |
*
|
|
839 |
* @param entry The entry to flush
|
|
840 |
* @param origin The origin of this flush event (optional)
|
|
841 |
*/
|
|
842 | 405 |
private void flushEntry(CacheEntry entry, String origin) { |
843 | 405 |
String key = entry.getKey(); |
844 |
|
|
845 |
// Flush the object itself
|
|
846 | 405 |
entry.flush(); |
847 |
|
|
848 | 405 |
if (!entry.isNew()) {
|
849 |
// Update the entry's state in the map
|
|
850 | 401 |
cacheMap.put(key, entry); |
851 |
|
|
852 |
// Trigger an ENTRY_FLUSHED event
|
|
853 | 401 |
CacheEntryEvent event = new CacheEntryEvent(this, entry, origin); |
854 | 401 |
dispatchCacheEntryEvent(CacheEntryEventType.ENTRY_FLUSHED, event); |
855 |
} else {
|
|
856 |
// The entry did not exist in the cache anyway, nothing to flush
|
|
857 |
// TODO: Do we need an event for this?
|
|
858 |
} |
|
859 |
} |
|
860 |
} |
|
861 |
|
|