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org.jbpm.workflow.delegation.impl
Class DbClassLoader  

java.lang.Object
  java.lang.ClassLoader
      org.jbpm.workflow.delegation.impl.DbClassLoader

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public class DbClassLoader

extends java.lang.ClassLoader

is used to load classes like Assigner's, Interaction's, Decision's from the database.

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Nested Class Summary

 

Nested classes inherited from class java.lang.ClassLoader

 

Field Summary
private static java.util.Map	classLoaderCache
private static org.apache.log4j.Logger	log
private  java.lang.Long	processDefinitionId
private static java.lang.String	queryFindClassFile

 

Fields inherited from class java.lang.ClassLoader

 

Constructor Summary
private	DbClassLoader(java.lang.Long processDefinitionId)

 

Method Summary
protected  java.lang.Class	findClass(java.lang.String name)           Called for every class name that is needed but has not yet been defined by this classloader or one of its parents.
static DbClassLoader	getInstance(java.lang.Long processDefinitionId)
java.lang.Class	loadClass(java.lang.String name)           Load a class using this ClassLoader or its parent, without resolving it.

 

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

queryFindClassFile

private static final java.lang.String queryFindClassFile

See Also:

Constant Field Values

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log

private static org.apache.log4j.Logger log

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classLoaderCache

private static java.util.Map classLoaderCache

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processDefinitionId

private java.lang.Long processDefinitionId

Constructor Detail

DbClassLoader

private DbClassLoader(java.lang.Long processDefinitionId)

Method Detail

getInstance

public static DbClassLoader getInstance(java.lang.Long processDefinitionId)

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findClass

protected java.lang.Class findClass(java.lang.String name)
                             throws java.lang.ClassNotFoundException

Description copied from class: java.lang.ClassLoader

Called for every class name that is needed but has not yet been defined by this classloader or one of its parents. It is called by loadClass() after both findLoadedClass() and parent.loadClass() couldn't provide the requested class.

The default implementation throws a ClassNotFoundException. Subclasses should override this method. An implementation of this method in a subclass should get the class bytes of the class (if it can find them), if the package of the requested class doesn't exist it should define the package and finally it should call define the actual class. It does not have to resolve the class. It should look something like the following:

 // Get the bytes that describe the requested class
 byte[] classBytes = classLoaderSpecificWayToFindClassBytes(name);
 // Get the package name
 int lastDot = name.lastIndexOf('.');
 if (lastDot != -1)
   {
     String packageName = name.substring(0, lastDot);
     // Look if the package already exists
     if (getPackage(packageName) == null)
       {
         // define the package
         definePackage(packageName, ...);
       }
   }
 // Define and return the class
  return defineClass(name, classBytes, 0, classBytes.length);
 

loadClass() makes sure that the Class returned by findClass() will later be returned by findLoadedClass() when the same class name is requested.

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loadClass

public java.lang.Class loadClass(java.lang.String name)
                          throws java.lang.ClassNotFoundException

Description copied from class: java.lang.ClassLoader

Load a class using this ClassLoader or its parent, without resolving it. Calls loadClass(name, false).

Subclasses should not override this method but should override findClass() which is called by this method.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> jbpm >> workflow >> delegation >> [ impl overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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