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Diffstat (limited to 'ridljar/com/sun/star/lib/uno/bridges/java_remote/ProxyFactory.java')
-rw-r--r-- | ridljar/com/sun/star/lib/uno/bridges/java_remote/ProxyFactory.java | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/ridljar/com/sun/star/lib/uno/bridges/java_remote/ProxyFactory.java b/ridljar/com/sun/star/lib/uno/bridges/java_remote/ProxyFactory.java new file mode 100644 index 000000000..1b3848983 --- /dev/null +++ b/ridljar/com/sun/star/lib/uno/bridges/java_remote/ProxyFactory.java @@ -0,0 +1,198 @@ +/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * 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.bridges.java_remote; + +import com.sun.star.bridge.XBridge; +import com.sun.star.lib.util.AsynchronousFinalizer; +import com.sun.star.uno.IQueryInterface; +import com.sun.star.uno.Type; +import com.sun.star.uno.UnoRuntime; + +import java.lang.reflect.InvocationHandler; +import java.lang.reflect.Method; +import java.lang.reflect.Proxy; + +/** + * A factory for proxies specific to the <code>java_remote_bridge</code>. + * + * <p>Eventually, this class should be united with all other proxy classes + * specific to certain bridges (for example, the JNI bridge), resulting in a + * generic proxy class.</p> + */ +final class ProxyFactory { + public ProxyFactory(RequestHandler requestHandler, XBridge bridge) { + this.requestHandler = requestHandler; + this.bridge = bridge; + } + + public Object create(String oid, Type type) { + return Proxy.newProxyInstance( + getClass().getClassLoader(), + new Class[] { com.sun.star.lib.uno.Proxy.class, + IQueryInterface.class, type.getZClass() }, + new Handler(oid, type)); + } + + public boolean isProxy(Object obj) { + if (Proxy.isProxyClass(obj.getClass())) { + InvocationHandler h = Proxy.getInvocationHandler(obj); + return h instanceof Handler && ((Handler) h).matches(this); + } else { + return false; + } + } + + public void dispose() throws InterruptedException { + asynchronousFinalizer.drain(); + } + + public static XBridge getBridge(Object obj) { + if (Proxy.isProxyClass(obj.getClass())) { + InvocationHandler h = Proxy.getInvocationHandler(obj); + if (h instanceof Handler) { + return ((Handler) h).getBridge(); + } + } + return null; + } + + static int getDebugCount() { + synchronized (debugCountLock) { + return debugCount; + } + } + + private static void incrementDebugCount() { + synchronized (debugCountLock) { + ++debugCount; + } + } + + private static void decrementDebugCount() { + synchronized (debugCountLock) { + --debugCount; + } + } + + private final class Handler implements InvocationHandler { + public Handler(String oid, Type type) { + this.oid = oid; + this.type = type; + incrementDebugCount(); + } + + public boolean matches(ProxyFactory factory) { + return ProxyFactory.this == factory; + } + + public XBridge getBridge() { + return bridge; + } + + public Object invoke(Object proxy, Method method, Object[] args) + throws Throwable + { + if (method.equals(METHOD_EQUALS) || method.equals(METHOD_IS_SAME)) { + return Boolean.valueOf(args[0] != null + && oid.equals(UnoRuntime.generateOid(args[0]))); + } else if (method.equals(METHOD_HASH_CODE)) { + return Integer.valueOf(oid.hashCode()); + } else if (method.equals(METHOD_TO_STRING)) { + return "[Proxy:" + System.identityHashCode(proxy) + "," + oid + + "," + type + "]"; + } else if (method.equals(METHOD_QUERY_INTERFACE)) { + // See the comment in java_remote_bridge.mapInterfaceTo for one + // reason why this implementation must not satisfy a request for + // a super-interface with a proxy itself: + return args[0].equals(type) ? proxy + : request("queryInterface", args); + } else if (method.equals(METHOD_GET_OID)) { + return oid; + } else { + return request(method.getName(), args); + } + } + + @Override + protected void finalize() { + decrementDebugCount(); + asynchronousFinalizer.add(new AsynchronousFinalizer.Job() { + public void run() throws Throwable { + request("release", null); + } + }); + } + + private Object request(String operation, Object[] args) throws Throwable + { + Object res = requestHandler.sendRequest(oid, type, operation, args); + // Avoid early finalization of this object, while an invoke -> + // request call is still ongoing; as finalize also calls request, + // this should fulfil the condition from The Java Language + // Specification, 3rd ed., that "if an object's finalizer can result + // in synchronization on that object, then that object must be alive + // and considered reachable whenever a lock is held on it:" + synchronized (this) { + ++dummy; + } + return res; + } + + private final String oid; + private final Type type; + @SuppressWarnings("unused") + private int dummy = 0; + } + + private static final Method METHOD_EQUALS; + private static final Method METHOD_HASH_CODE; + private static final Method METHOD_TO_STRING; + private static final Method METHOD_QUERY_INTERFACE; + private static final Method METHOD_IS_SAME; + private static final Method METHOD_GET_OID; + static { + try { + METHOD_EQUALS = Object.class.getMethod( + "equals", new Class[] { Object.class }); + METHOD_HASH_CODE = Object.class.getMethod( + "hashCode", (Class[]) null); + METHOD_TO_STRING = Object.class.getMethod( + "toString", (Class[]) null); + METHOD_QUERY_INTERFACE = IQueryInterface.class.getMethod( + "queryInterface", new Class[] { Type.class }); + METHOD_IS_SAME = IQueryInterface.class.getMethod( + "isSame", new Class[] { Object.class }); + METHOD_GET_OID = IQueryInterface.class.getMethod( + "getOid", (Class[]) null); + } catch (NoSuchMethodException e) { + throw new ExceptionInInitializerError(e); + } + } + + private static final Object debugCountLock = new Object(); + private static int debugCount = 0; + + private final RequestHandler requestHandler; + private final XBridge bridge; + private final AsynchronousFinalizer asynchronousFinalizer = + new AsynchronousFinalizer(); +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |