MultiGroupRequestCallBack.java

/*
 * (C) 2007-2012 Alibaba Group Holding Limited.
 * 
 * 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 com.taobao.gecko.service.callback;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;

import com.taobao.gecko.core.command.RequestCommand;
import com.taobao.gecko.core.command.ResponseCommand;
import com.taobao.gecko.service.Connection;
import com.taobao.gecko.service.MultiGroupCallBackListener;
import com.taobao.gecko.service.impl.DefaultConnection;


/**
 * 
 * ���͸�������������ص�
 * 
 * @author boyan
 * 
 * @since 1.0, 2009-12-16 ����11:30:57
 */

public class MultiGroupRequestCallBack extends AbstractRequestCallBack {
    private final ConcurrentHashMap<String/* group */, ResponseCommand/* Ӧ�� */> responseCommandMap;
    private final MultiGroupCallBackListener listener;
    private final AtomicBoolean responsed;
    private final Object[] args; // �ͻ�����ĸ��Ӳ���


    public MultiGroupRequestCallBack(final MultiGroupCallBackListener listener, final CountDownLatch countDownLatch,
            final long timeout, final long timestamp,
            final ConcurrentHashMap<String/* group */, ResponseCommand/* Ӧ�� */> responseCommandMap,
            final AtomicBoolean responsed, final Object... args) {
        super(countDownLatch, timeout, timestamp);
        this.listener = listener;
        this.responseCommandMap = responseCommandMap;
        this.responsed = responsed;
        this.args = args;
    }


    @Override
    public void setException0(final Exception e, final Connection conn, final RequestCommand requestCommand) {
        final String group = this.getGroupFromConnection(conn, requestCommand);
        if (group != null) {
            if (this.responseCommandMap.putIfAbsent(group,
                createComunicationErrorResponseCommand(conn, e, requestCommand, conn.getRemoteSocketAddress())) == null) {
                this.countDownLatch();
            }
        }
        this.tryNotifyListener();
    }


    private String getGroupFromConnection(final Connection conn, final RequestCommand requestCommand) {
        String group = null;
        if (conn != null) {
            group = ((DefaultConnection) conn).removeOpaqueToGroupMapping(requestCommand.getOpaque());
        }
        return group;
    }


    @Override
    public void complete() {
        this.responsed.set(true);
    }


    @Override
    public boolean isComplete() {
        return this.responsed.get();
    }


    @Override
    public void onResponse0(String group, final ResponseCommand responseCommand, final Connection connection) {
        final DefaultConnection defaultConnection = (DefaultConnection) connection;
        if (defaultConnection != null) {
            // ɾ��opaque��group��ӳ��
            final String reqGroup = defaultConnection.removeOpaqueToGroupMapping(responseCommand.getOpaque());
            if (reqGroup != null) {
                group = reqGroup;
            }
        }
        if (group != null) {
            if (this.responseCommandMap.putIfAbsent(group, responseCommand) == null) {
                this.countDownLatch();
            }
            this.tryNotifyListener();
        }
        else {
            // ������˵��Ӧ�ó����������������Ԥ����һ������Ҫȷ���Ƴ�callBack
            if (defaultConnection != null) {
                defaultConnection.removeRequestCallBack(responseCommand.getOpaque());
            }
        }
    }


    private void tryNotifyListener() {
        if (this.tryComplete()) {
            if (this.listener != null) {
                if (this.listener.getExecutor() != null) {
                    this.listener.getExecutor().execute(new Runnable() {
                        public void run() {
                            MultiGroupRequestCallBack.this.listener.onResponse(
                                MultiGroupRequestCallBack.this.responseCommandMap, MultiGroupRequestCallBack.this.args);
                        }
                    });
                }
                else {
                    this.listener.onResponse(this.responseCommandMap, this.args);
                }
            }
        }
    }


    public Map<String, ResponseCommand> getResponseCommandMap() {
        return this.responseCommandMap;
    }

}