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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.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;
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();
}
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