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java.lang.Objectorg.apache.jdo.impl.fostore.RequestHandler
org.apache.jdo.impl.fostore.GetExtentHandler
Process GetExtent requests.
Nested Class Summary | |
(package private) static interface |
RequestHandler.HandlerFactory
Means by which subclasses are created. |
Field Summary | |
protected FOStoreServerConnection |
con
Connection on which the Request arrived. |
static RequestHandler.HandlerFactory |
factory
|
protected int |
length
Length of the data in the Request. |
(package private) static org.apache.commons.logging.Log |
logger
Logger |
protected Reply |
reply
Subclasses use this Reply instance to send data back to their corresponding client-side request. |
Constructor Summary | |
private |
GetExtentHandler(Reply reply,
int length,
FOStoreServerConnection con)
|
Method Summary | |
(package private) java.util.HashSet |
getDBExtents(CLID clid,
boolean subclasses,
FOStoreDatabase db)
Get a set of CLIDs of extents for the given clid. |
protected boolean |
getOkToFinish()
The RollbackHandler should override this and return false, so that finishers are not run when we are rolling back. |
(package private) RequestFinisher |
handleRequest()
The desired extent's class can be specified either by CLID (i.e., the class's CLID was already loaded from store to the client) or classname and FSUID (in case the CLID wasn't known). |
(package private) static void |
handleRequests(FOStoreServerConnection con)
Handles all requests that can be read at this time from the given connection. |
protected void |
setOkToCommit(boolean okToCommit)
The CommitHandler should override this and save the given value, then use it to determine whether or not to commit. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
public static final RequestHandler.HandlerFactory factory
protected final Reply reply
protected final int length
protected final FOStoreServerConnection con
static final org.apache.commons.logging.Log logger
Constructor Detail |
private GetExtentHandler(Reply reply, int length, FOStoreServerConnection con)
Method Detail |
RequestFinisher handleRequest() throws java.io.IOException, FOStoreDatabaseException
handleRequest
in class RequestHandler
java.io.IOException
FOStoreDatabaseException
RequestHandler.handleRequest()
,
GetExtentRequest.doRequestBody()
java.util.HashSet getDBExtents(CLID clid, boolean subclasses, FOStoreDatabase db) throws FOStoreDatabaseException
clid
- The CLID of the class whose extent is wanted.subclasses
- If true, then include extents for all subclasses of
the class corresponding to CLID.db
- Database in which to find extents.
FOStoreDatabaseException
- if a database error occurs.protected boolean getOkToFinish()
protected void setOkToCommit(boolean okToCommit)
static void handleRequests(FOStoreServerConnection con)
The data it generates for the client is documented; see ReplyHandler.processReplies(java.io.DataInput, org.apache.jdo.impl.fostore.Message)
.
If after all requests are thusly handled, none have indicated that the second round of handling, called finishing, is not to be done, then performs this second round. The finishers that are invoked are precisely those which were returned from each request's handleRequest invocation, and the finishers have their finish() methods invoked in the same order in which the requests were originally invoked.
Finally, writes the number of replies (at the beginning of the reply data, in a spot that was set aside for this purpose), and sends replies back to the client.
This method is very paranoid about error checking, which clutters it up some, but is necessary to ensure that the server keeps running.
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