donaldp 02/04/27 21:50:32
Added: aut/src/java/org/apache/aut/jprocess DemuxPolicy.java
PolicyRedirector.java
Log:
Add in a Policy redirector so that you can
bind per-thread Policy
Revision Changes Path
1.1
jakarta-ant-myrmidon/aut/src/java/org/apache/aut/jprocess/DemuxPolicy.java
Index: DemuxPolicy.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.aut.jprocess;
import java.security.CodeSource;
import java.security.PermissionCollection;
import java.security.Policy;
/**
* This is a Policy object that delegates to a Policy objects
* associated with the current thread.
*
* @author <a href="mailto:[EMAIL PROTECTED]">Peter Donald</a>
* @version $Revision: 1.1 $ $Date: 2002/04/28 04:50:32 $
*/
public class DemuxPolicy
extends Policy
{
/**
* The Policy associated with each thread.
*/
private final InheritableThreadLocal m_policies =
new InheritableThreadLocal();
/**
* The default Policy to fall back on if no Policy
* object bound.
*/
private final Policy m_defaultPolicy;
/**
* Create a Policy object that delegates to per-thread
* Policy objects.
*
* @param defaultPolicy the default Policy object
*/
public DemuxPolicy( final Policy defaultPolicy )
{
m_defaultPolicy = defaultPolicy;
}
/**
* Bind the specified Policy object to the current thread.
*
* @param policy the Policy object to bind
*/
public Policy bindPolicy( final Policy policy )
{
final Policy oldPolicy = (Policy)m_policies.get();
m_policies.set( policy );
return oldPolicy;
}
public PermissionCollection getPermissions( final CodeSource codesource )
{
return getCurrentPolicy().getPermissions( codesource );
}
public void refresh()
{
getCurrentPolicy().refresh();
}
/**
* Retrieve Policy currently in operation.
*
* @return the current policy
*/
private Policy getCurrentPolicy()
{
final Policy policy = (Policy)m_policies.get();
if( null == policy )
{
return m_defaultPolicy;
}
else
{
return policy;
}
}
}
1.1
jakarta-ant-myrmidon/aut/src/java/org/apache/aut/jprocess/PolicyRedirector.java
Index: PolicyRedirector.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.aut.jprocess;
import java.io.IOException;
import java.security.Policy;
/**
* This is a utility class that makes it easy to install redirecting
* Policy objects. The Policy object will redirect to the Policy object
* that is associated with the current thread. A Policy becomes
* associated with the current thread when a user calls the
* [EMAIL PROTECTED] #bindPolicy} method or by inheriting the parent threads
Policy
* when thread is initially created. The default Policy will redirect
* to the default Policy.
*
* @author <a href="mailto:[EMAIL PROTECTED]">Peter Donald</a>
* @version $Revision: 1.1 $ $Date: 2002/04/28 04:50:32 $
*/
public final class PolicyRedirector
{
private static final String NOT_INSTALLED_ERR =
"PolicyRedirector not installed";
/**
* Cached version of original System Policy.
* (Or at least the Policy that were installed in JVM
* when this class is loaded and resovled).
*/
private static final Policy c_systemPolicy = Policy.getPolicy();
private static DemuxPolicy c_policy;
/**
* Private constructor to block instantiation.
*/
private PolicyRedirector()
{
}
/**
* Install the Redirector.
*
* @return true if installed, false if already installed
*/
public synchronized static boolean install()
throws IOException
{
if( c_policy == Policy.getPolicy() )
{
//Already installed so lets ignore
return false;
}
c_policy = new DemuxPolicy( c_systemPolicy );
Policy.setPolicy( c_policy );
return true;
}
/**
* Uninstall the redirector.
*
* @return true if uninstalled, false if already uninstalled
*/
public synchronized static boolean uninstall()
throws IOException
{
if( c_policy != Policy.getPolicy() )
{
//Already uninstalled so lets ignore
return false;
}
c_policy = null;
Policy.setPolicy( c_systemPolicy );
return true;
}
/**
* Bind the specified Policy object to this thread.
*
* @param policy the Policy to bind
* @throws SecurityException if don't have permission to bind
* @throws IllegalStateException if redirector not installed
*/
public static Policy bindPolicy( final Policy policy )
throws SecurityException, IllegalStateException
{
if( null == policy )
{
throw new NullPointerException( "policy" );
}
if( null == c_policy )
{
throw new IllegalStateException( NOT_INSTALLED_ERR );
}
final SecurityManager manager = System.getSecurityManager();
if( null != manager )
{
final RuntimePermission permission =
new RuntimePermission( "PolicyRedirector.setPolicy" );
manager.checkPermission( permission );
}
return c_policy.bindPolicy( policy );
}
}
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