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java.lang.Objectorg.apache.derby.impl.services.reflect.DatabaseClasses
abstract class DatabaseClasses
An abstract implementation of the ClassFactory. This package can be extended to fully implement a ClassFactory. Implementations can differ in two areas, how they load a class and how they invoke methods of the generated class.
This class manages a hash table of loaded generated classes and their GeneratedClass objects. A loaded class may be referenced multiple times -- each class has a reference count associated with it. When a load request arrives, if the class has already been loaded, its ref count is incremented. For a remove request, the ref count is decremented unless it is the last reference, in which case the class is removed. This is transparent to users.
ClassFactory
Field Summary | |
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private UpdateLoader |
applicationLoader
|
private ClassInspector |
classInspector
|
private JavaFactory |
javaFactory
|
Constructor Summary | |
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DatabaseClasses()
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Method Summary | |
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void |
boot(boolean create,
java.util.Properties startParams)
Boot this module with the given properties. |
ByteArray |
buildSpecificFactory(java.lang.String className,
java.lang.String factoryName)
|
ClassInspector |
getClassInspector()
Return a ClassInspector object |
int |
getClassLoaderVersion()
Return the in-memory "version" of the class manager. |
boolean |
isApplicationClass(java.lang.Class theClass)
Was the passed in class loaded by a ClassManager. |
java.lang.Class |
loadApplicationClass(java.io.ObjectStreamClass classDescriptor)
Load an application class, or a class that is potentially an application class. |
java.lang.Class |
loadApplicationClass(java.lang.String className)
Load an application class, or a class that is potentially an application class. |
(package private) abstract java.lang.Class |
loadClassNotInDatabaseJar(java.lang.String className)
|
GeneratedClass |
loadGeneratedClass(java.lang.String fullyQualifiedName,
ByteArray classDump)
Here we load the newly added class now, rather than waiting for the findGeneratedClass(). |
(package private) abstract LoadedGeneratedClass |
loadGeneratedClassFromData(java.lang.String fullyQualifiedName,
ByteArray classDump)
|
void |
notifyModifyClasspath(java.lang.String classpath)
Notify the class manager that the classpath has been modified. |
void |
notifyModifyJar(boolean reload)
Notify the class manager that a jar file has been modified. |
void |
stop()
Stop the module. |
private static void |
WriteClassFile(java.lang.String fullyQualifiedName,
ByteArray bytecode,
java.lang.Throwable t)
|
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private ClassInspector classInspector
private JavaFactory javaFactory
private UpdateLoader applicationLoader
Constructor Detail |
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DatabaseClasses()
Method Detail |
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public void boot(boolean create, java.util.Properties startParams) throws StandardException
ModuleControl
An implementation's boot method can throw StandardException. If it is thrown the module is not registered by the monitor and therefore cannot be found through a findModule(). In this case the module's stop() method is not called, thus throwing this exception must free up any resources.
When create is true the contents of the properties object
will be written to the service.properties of the persistent
service. Thus any code that requires an entry in service.properties
must explicitly place the value in this properties set
using the put method.
Typically the properties object contains one or more default
properties sets, which are not written out to service.properties.
These default sets are how callers modify the create process. In a
JDBC connection database create the first set of defaults is a properties
object that contains the attributes that were set on the jdbc:derby: URL.
This attributes properties set has the second default properties set as
its default. This set (which could be null) contains the properties
that the user set on their DriverManager.getConnection() call, and are thus
not owned by Derby code, and thus must not be modified by Derby
code.
When create is false the properties object contains all the properties set in the service.properties file plus a limited number of attributes from the JDBC URL attributes or connection properties set. This avoids properties set by the user compromising the boot process. An example of a property passed in from the JDBC world is the bootPassword for encrypted databases.
Code should not hold onto the passed in properties reference after boot time as its contents may change underneath it. At least after the complete boot is completed, the links to all the default sets will be removed.
boot
in interface ModuleControl
StandardException
- Module cannot be started.Monitor
,
ModuleFactory
public void stop()
ModuleControl
stop
in interface ModuleControl
Monitor
,
ModuleFactory
public final GeneratedClass loadGeneratedClass(java.lang.String fullyQualifiedName, ByteArray classDump) throws StandardException
loadGeneratedClass
in interface ClassFactory
StandardException
- Class format is bad.ClassFactory.loadGeneratedClass(java.lang.String, org.apache.derby.iapi.util.ByteArray)
private static void WriteClassFile(java.lang.String fullyQualifiedName, ByteArray bytecode, java.lang.Throwable t)
public ClassInspector getClassInspector()
ClassFactory
getClassInspector
in interface ClassFactory
public final java.lang.Class loadApplicationClass(java.lang.String className) throws java.lang.ClassNotFoundException
ClassFactory
loadApplicationClass
in interface ClassFactory
java.lang.ClassNotFoundException
- Class cannot be found, or
a SecurityException or LinkageException was thrown loading the class.abstract java.lang.Class loadClassNotInDatabaseJar(java.lang.String className) throws java.lang.ClassNotFoundException
java.lang.ClassNotFoundException
public final java.lang.Class loadApplicationClass(java.io.ObjectStreamClass classDescriptor) throws java.lang.ClassNotFoundException
ClassFactory
loadApplicationClass
in interface ClassFactory
java.lang.ClassNotFoundException
- Class cannot be found, or
a SecurityException or LinkageException was thrown loading the class.public boolean isApplicationClass(java.lang.Class theClass)
ClassFactory
isApplicationClass
in interface ClassFactory
public void notifyModifyJar(boolean reload) throws StandardException
ClassFactory
notifyModifyJar
in interface ClassFactory
reload
- Restart any attached class loader
StandardException
- thrown on errorpublic void notifyModifyClasspath(java.lang.String classpath) throws StandardException
notifyModifyClasspath
in interface ClassFactory
StandardException
- thrown on errorpublic int getClassLoaderVersion()
ClassFactory
getClassLoaderVersion
in interface ClassFactory
public ByteArray buildSpecificFactory(java.lang.String className, java.lang.String factoryName) throws StandardException
StandardException
abstract LoadedGeneratedClass loadGeneratedClassFromData(java.lang.String fullyQualifiedName, ByteArray classDump)
|
Built on Thu 2012-03-29 21:53:33+0000, from revision ??? | ||||||||
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