com.sun.jini.thread

Class GetThreadPoolAction

java.lang.Object

com.sun.jini.thread.GetThreadPoolAction

All Implemented Interfaces:

PrivilegedAction

public final class GetThreadPoolAction
extends Object
implements PrivilegedAction

Provides security-checked access to internal thread pools as a java.security.PrivilegedAction, to be used conveniently with an AccessController.doPrivileged or Security.doPrivileged. There are two internal thread pools: one of threads in the system thread group, for executing tasks to be guarded by the security policy for the system thread group, and one of threads in a non-system thread group, for executing tasks with user code that should not be restricted by that policy. If there is a security manager, the run method will check the ThreadPoolPermission for the requested thread pool. If used with a doPrivileged (the typical case), then only the protection domain of the immediate caller of the doPrivileged needs the permission. The thread pools execute an action in a thread without the security context in which the execute method was invoked, without any subject, and with the system class loader as the context class loader. Actions are expected to complete with the same context class loader and other thread-specific state (such as priority) that they were started with.

Author:

Sun Microsystems, Inc.

Field Summary

Fields

Modifier and Type	Field and Description
private static Permission	getSystemThreadPoolPermission
private static Permission	getUserThreadPoolPermission
private static ThreadPool	systemThreadPool pool of threads for executing tasks in system thread group
private boolean	user
private static ThreadPool	userThreadPool pool of threads for executing tasks with user code

Constructor Summary

Constructors

Constructor and Description
GetThreadPoolAction(boolean user) Creates an action that will obtain an internal thread pool.

Method Summary

Methods

Modifier and Type	Method and Description
Object	run()

Methods inherited from class java.lang.Object

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

Field Detail

systemThreadPool

private static final ThreadPool systemThreadPool

pool of threads for executing tasks in system thread group

userThreadPool

private static final ThreadPool userThreadPool

pool of threads for executing tasks with user code

getSystemThreadPoolPermission

private static final Permission getSystemThreadPoolPermission

getUserThreadPoolPermission

private static final Permission getUserThreadPoolPermission

user

private final boolean user

Constructor Detail

GetThreadPoolAction

public GetThreadPoolAction(boolean user)

Creates an action that will obtain an internal thread pool. When run, this action verifies that the current access control context has permission to access the thread group used by the indicated pool.

Parameters:

user - if true, will obtain the non-system thread group pool for executing user code; if false, will obtain the system thread group pool

Method Detail

run

public Object run()

Specified by:

run in interface PrivilegedAction