/*
* Copyright (C) 2010-2101 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.alibaba.otter.node.common.communication;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.math.RandomUtils;
import org.springframework.beans.factory.DisposableBean;
import com.alibaba.otter.node.common.config.ConfigClientService;
import com.alibaba.otter.shared.common.model.config.node.Node;
import com.alibaba.otter.shared.communication.core.CommunicationClient;
import com.alibaba.otter.shared.communication.core.exception.CommunicationException;
import com.alibaba.otter.shared.communication.core.impl.DefaultCommunicationClientImpl;
import com.alibaba.otter.shared.communication.core.model.Callback;
import com.alibaba.otter.shared.communication.core.model.Event;
/**
* 封装了基于communication通讯的工具
*
* @author jianghang 2011-10-18 下午02:18:04
* @version 4.0.0
*/
public class NodeCommmunicationClient implements DisposableBean {
private CommunicationClient delegate;
private ConfigClientService configClientService;
private List<String> managerAddress;
private volatile int index = 0;
/**
* 指定对应的Node节点，进行event调用
*/
public Object call(Long nid, final Event event) {
return delegate.call(convertToAddress(nid), event);
}
/**
* 指定对应的Node节点，进行event调用
*
* <pre>
* 注意：该方法为异步调用
* </pre>
*/
public void call(Long nid, Event event, final Callback callback) {
delegate.call(convertToAddress(nid), event, callback);
}
/**
* 指定manager，进行event调用
*/
public Object callManager(final Event event) {
CommunicationException ex = null;
Object object = null;
for (int i = index; i < index + managerAddress.size(); i++) { // 循环一次manager的所有地址
String address = managerAddress.get(i % managerAddress.size());
try {
object = delegate.call(address, event);
index = i; // 更新一下上一次成功的地址
return object;
} catch (CommunicationException e) {
// retry next address;
ex = e;
}
}
throw ex; // 走到这一步，说明肯定有出错了
}
/**
* 指定manager，进行event调用
*
* <pre>
* 注意：该方法为异步调用
* </pre>
*/
public void callManager(final Event event, final Callback callback) {
if (delegate instanceof DefaultCommunicationClientImpl) {
((DefaultCommunicationClientImpl) delegate).submit(new Runnable() {
public void run() {
Object obj = callManager(event);
callback.call(obj);
}
});
}
}
private String convertToAddress(Long nid) {
Node node = configClientService.findNode(nid);
return node.getIp() + ":" + node.getPort();
}
public void destroy() throws Exception {
}
// ================== setter / getter =====================
public void setDelegate(CommunicationClient delegate) {
this.delegate = delegate;
}
public void setManagerAddress(String managerAddress) {
String server = StringUtils.replace(managerAddress, ";", ",");
String[] servers = StringUtils.split(server, ',');
this.managerAddress = Arrays.asList(servers);
this.index = RandomUtils.nextInt(this.managerAddress.size()); // 随机选择一台机器
}
public void setConfigClientService(ConfigClientService configClientService) {
this.configClientService = configClientService;
}
public String getManagerAddress() {
return StringUtils.join(managerAddress, ",");
}
}