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
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index 000000000..1b3848983
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+++ 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: */