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TomcatInstrumentableClassLoader (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.instrument.classloading.tomcat
Class TomcatInstrumentableClassLoader

java.lang.Object
  java.lang.ClassLoader
      java.security.SecureClassLoader
          java.net.URLClassLoader
              org.apache.catalina.loader.WebappClassLoader
                  org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader

All Implemented Interfaces:

org.apache.catalina.Lifecycle, org.apache.catalina.loader.Reloader

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public class TomcatInstrumentableClassLoader
extends org.apache.catalina.loader.WebappClassLoader

Extension of Tomcat's default class loader which adds instrumentation to loaded classes without the need of using a VM-wide agent.

To be registered using a Loader tag in Tomcat's Context definition in the server.xml file, with the Spring-provided "spring-tomcat-weaver.jar" file deployed into Tomcat's "server/lib" directory. The required configuration tag looks as follows:

 <Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader"/>

Typically used in combination with a ReflectiveLoadTimeWeaver defined in the Spring application context. The addTransformer and getThrowawayClassLoader methods mirror the corresponding methods in the LoadTimeWeaver interface, as expected by ReflectiveLoadTimeWeaver.

See the PetClinic sample application for a full example of this ClassLoader in action.

NOTE: Requires Apache Tomcat version 5.0 or higher.

Since:

2.0

Author:

Costin Leau

See Also:

addTransformer(java.lang.instrument.ClassFileTransformer), getThrowawayClassLoader(), ReflectiveLoadTimeWeaver

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Nested Class Summary

 

Nested classes/interfaces inherited from class org.apache.catalina.loader.WebappClassLoader
org.apache.catalina.loader.WebappClassLoader.PrivilegedFindResource

 

Field Summary

 

Fields inherited from class org.apache.catalina.loader.WebappClassLoader
allPermission, delegate, files, hasExternalRepositories, jarFiles, jarNames, jarPath, jarRealFiles, lastJarAccessed, lastModifiedDates, loaderDir, loaderPC, log, needConvert, notFoundResources, packageTriggers, parent, paths, permissionList, repositories, repositoryURLs, resourceEntries, resources, securityManager, sm, started, system, triggers

 

Fields inherited from interface org.apache.catalina.Lifecycle
AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, DESTROY_EVENT, INIT_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT

 

Constructor Summary
TomcatInstrumentableClassLoader()
TomcatInstrumentableClassLoader(ClassLoader classLoader)

 

Method Summary
void	addTransformer(ClassFileTransformer transformer)           Delegate for LoadTimeWeaver's addTransformer method.
protected  org.apache.catalina.loader.ResourceEntry	findResourceInternal(String name, String path)
ClassLoader	getThrowawayClassLoader()           Delegate for LoadTimeWeaver's getThrowawayClassLoader method.
String	toString()

 

Methods inherited from class org.apache.catalina.loader.WebappClassLoader

addLifecycleListener, addPermission, addPermission, addPermission, addRepository, addURL, cleanElCache, clearReferences, closeJARs, deleteDir, filter, findClass, findClassInternal, findLifecycleListeners, findLoadedClass0, findLoadedResource, findRepositories, findResource, findResourceInternal, findResources, getAntiJARLocking, getDelegate, getJarPath, getPermissions, getResource, getResourceAsStream, getResources, getURI, getURL, getURLs, isPackageSealed, loadClass, loadClass, loadedByThisOrChild, modified, nullInstance, openJARs, refreshPolicy, removeLifecycleListener, setAntiJARLocking, setDelegate, setJarPath, setParentClassLoader, setResources, setWorkDir, start, stop, validate, validateJarFile

 

Methods inherited from class java.net.URLClassLoader
definePackage, newInstance, newInstance

 

Methods inherited from class java.security.SecureClassLoader
defineClass, defineClass

 

Methods inherited from class java.lang.ClassLoader
clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getPackage, getPackages, getParent, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Constructor Detail

TomcatInstrumentableClassLoader

public TomcatInstrumentableClassLoader()

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TomcatInstrumentableClassLoader

public TomcatInstrumentableClassLoader(ClassLoader classLoader)

Method Detail

addTransformer

public void addTransformer(ClassFileTransformer transformer)

Delegate for LoadTimeWeaver's addTransformer method. Typically called through ReflectiveLoadTimeWeaver.

See Also:

LoadTimeWeaver.addTransformer(java.lang.instrument.ClassFileTransformer), ReflectiveLoadTimeWeaver

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getThrowawayClassLoader

public ClassLoader getThrowawayClassLoader()

Delegate for LoadTimeWeaver's getThrowawayClassLoader method. Typically called through ReflectiveLoadTimeWeaver.

See Also:

LoadTimeWeaver.getThrowawayClassLoader(), ReflectiveLoadTimeWeaver

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findResourceInternal

protected org.apache.catalina.loader.ResourceEntry findResourceInternal(String name,
                                                                        String path)

Overrides:

findResourceInternal in class org.apache.catalina.loader.WebappClassLoader

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toString

public String toString()

Overrides:

toString in class org.apache.catalina.loader.WebappClassLoader

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