org.rzo.netty.ahessian.rpc.callback.ServerCallbackProxy.java Source code

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Here is the source code for org.rzo.netty.ahessian.rpc.callback.ServerCallbackProxy.java

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/*******************************************************************************
 * Copyright  2015 rzorzorzo@users.sf.net
 *
 * Licensed 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package org.rzo.netty.ahessian.rpc.callback;

import io.netty.util.HashedWheelTimer;
import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

import org.rzo.netty.ahessian.Constants;
import org.rzo.netty.ahessian.rpc.client.HessianProxyFuture;
import org.rzo.netty.ahessian.rpc.message.HessianRPCCallMessage;
import org.rzo.netty.ahessian.rpc.server.HessianRPCServiceHandler;

public class ServerCallbackProxy implements InvocationHandler, Constants {
    private boolean _done = false;
    private HessianRPCServiceHandler _handler;
    private HessianRPCCallMessage _message;
    private ClientCallback _clientCallback;
    boolean _closed = false;
    private Set<String> _returnMethods;
    static private AtomicLong _idCounter = new AtomicLong();
    static private Map<Long, HessianProxyFuture> _openCallbackCalls = new ConcurrentHashMap<Long, HessianProxyFuture>();
    static private Timer _timer = new HashedWheelTimer();

    public ServerCallbackProxy(HessianRPCServiceHandler handler, HessianRPCCallMessage message,
            ClientCallback clientCallback) {
        _message = message;
        _clientCallback = clientCallback;
        _handler = handler;
        _returnMethods = new HashSet();
        if (clientCallback.getReturnMethods() != null)
            for (String method : clientCallback.getReturnMethods())
                _returnMethods.add(method);
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        return invoke(method.getName(), args);
    }

    public Object invoke(String method, Object[] args) {
        if (_closed)
            throw new RuntimeException("cannot invoke callback after call to setDone(true)");
        String methodName = method;
        if ("setDone".equals(methodName) && args.length == 1 && (args[0] instanceof Boolean)) {
            _done = ((Boolean) args[0]).booleanValue();
            return null;
        }
        if ("isDone".equals(method) && (args == null || args.length == 0)) {
            return (Boolean) _done;
        }

        if ("isValid".equals(method) && (args == null || args.length == 0)) {
            return (Boolean) _message.isValid();
        }

        if ("toString".equals(method) && (args == null || args.length == 0)) {
            return this.toString();
        }

        if ("hashCode".equals(method) && (args == null || args.length == 0)) {
            return this.hashCode();
        }

        if ("equals".equals(method) && (args.length == 1)) {
            return this.equals(args[0]);
        }

        CallbackReplyMessage reply = new CallbackReplyMessage(methodName, args, null, _message);
        reply.setCallId((Long) _message.getHeaders().get(CALL_ID_HEADER_KEY));
        reply.setGroup((Integer) _message.getHeaders().get(GROUP_HEADER_KEY));
        reply.setCallbackId(_clientCallback.getId());
        reply.setCallbackArgs(args);
        reply.setCallbackMethod(methodName);
        reply.setCallbackCallId(_idCounter.incrementAndGet());
        if (_done)
            reply.setCallbackDone(true);

        HessianProxyFuture future = null;
        if (_returnMethods.contains(methodName)) {
            future = new HessianProxyFuture();
            // System.out.println("put _openCallbackCalls "+
            // reply.getCallbackCallId() + " "+future);
            _openCallbackCalls.put(reply.getCallbackCallId(), future);
        }

        _handler.writeResult(reply);

        if (_done)
            _closed = true;

        Object result = null;
        if (_returnMethods.contains(methodName))
            result = waitForCallbackResult(reply.getCallbackCallId(), future);
        return result;
    }

    private Object waitForCallbackResult(final Long id, final HessianProxyFuture future) {
        long timeout = 10000;
        if (timeout > 0) {
            TimerTask task = new TimerTask() {

                public void run(Timeout arg0) throws Exception {
                    _openCallbackCalls.remove(id);
                    future.timedOut();
                }

            };
            future.setTimeout(_timer.newTimeout(task, timeout, TimeUnit.MILLISECONDS));
        }

        try {
            return future.getCallbackResult();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void setCallbackResult(HessianRPCCallMessage reply) {
        Long id = (Long) reply.getHeaders().get(CALLBACK_CALL_ID_HEADER_KEY);
        if (id == null) {
            return;
        }

        HessianProxyFuture future = _openCallbackCalls.get(id);
        // System.out.println("get _openCallbackCalls "+ id + " "+future);
        if (future == null)
            return;
        future.setCallbackResult(reply);
    }

}