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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
package com.sun.star.lib.uno.environments.remote;
/**
* Manages the UNO thread pool factory.
*
* <P>The thread pool factory is a process-wide resource. It is important that
* all UNO environments within a process share the same thread pool mechanisms:
* if a synchronous UNO call is bridged out from one local UNO environment over
* one remote bridge, and recursively calls back into another local UNO
* environment over another remote bridge, the code in the second environment
* should be executed in the thread that did the original call from the first
* environment.</P>
*
* <P>There are both a Java and a native thread pool factory. A pure Java
* process will always use the Java thread pool factory. A mixed process uses
* the system property <CODE>org.openoffice.native</CODE> (to be set by the
* native code that starts the JVM) to determine which implementation
* to use.</P>
*/
public final class ThreadPoolManager {
/**
* Creates a thread pool instance.
*
* @return a new thread pool instance; will never be <CODE>null</CODE>.
*/
public static synchronized IThreadPool create() {
if (useNative) {
return new NativeThreadPool();
} else {
if (javaFactory == null) {
javaFactory = new JavaThreadPoolFactory();
}
return javaFactory.createThreadPool();
}
}
/**
* Leads to using the native thread pool factory, unless a Java thread pool
* has already been created.
*
* @return <CODE>false</CODE> if a Java thread pool has already been created.
*/
public static synchronized boolean useNative() {
useNative = javaFactory == null;
return useNative;
}
private static boolean useNative
= System.getProperty("org.openoffice.native") != null;
private static JavaThreadPoolFactory javaFactory = null;
private ThreadPoolManager() {} // do not instantiate
}
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