INTEGRATION: CWS sb8 (1.1.2); FILE ADDED

2003/10/06 08:34:18 sb 1.1.2.1: #112127# Replacement for ThreadPoolFactory.

jurt/com/sun/star/lib/uno/environments/remote/ThreadPoolManager.java

+/*************************************************************************
+ *
+ *  $RCSfile: ThreadPoolManager.java,v $
+ *
+ *  $Revision: 1.2 $
+ *
+ *  last change: $Author: vg $ $Date: 2003-10-09 10:11:07 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (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.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2002 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+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
+}