/*
* 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.shared.communication.core.impl;
import java.lang.reflect.Method;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.ReflectionUtils;
import com.alibaba.otter.shared.communication.core.CommunicationEndpoint;
import com.alibaba.otter.shared.communication.core.CommunicationRegistry;
import com.alibaba.otter.shared.communication.core.exception.CommunicationException;
import com.alibaba.otter.shared.communication.core.model.Event;
import com.alibaba.otter.shared.communication.core.model.heart.HeartEvent;
/**
* 默认的endpoint实现
*
* @author jianghang 2011-9-9 下午07:01:49
*/
public abstract class AbstractCommunicationEndpoint implements CommunicationEndpoint {
// 需要禁止输出详细内容的事件
private static final Logger logger = LoggerFactory.getLogger(CommunicationEndpoint.class);
private static final String DEFAULT_METHOD = "handleEvent";
/**
* 处理指定的事件
*/
public Object acceptEvent(Event event) {
if (event instanceof HeartEvent) {
return event; // 针对心跳请求，返回一个随意结果
}
try {
Object action = CommunicationRegistry.getAction(event.getType());
if (action != null) {
// 通过反射获取方法并执行
String methodName = "on" + StringUtils.capitalize(event.getType().toString());
Method method = ReflectionUtils.findMethod(action.getClass(), methodName,
new Class[] { event.getClass() });
if (method == null) {
methodName = DEFAULT_METHOD; // 尝试一下默认方法
method = ReflectionUtils.findMethod(action.getClass(), methodName, new Class[] { event.getClass() });
if (method == null) { // 再尝试一下Event参数
method = ReflectionUtils.findMethod(action.getClass(), methodName, new Class[] { Event.class });
}
}
// 方法不为空就调用指定的方法,反之调用缺省的处理函数
if (method != null) {
try {
ReflectionUtils.makeAccessible(method);
return method.invoke(action, new Object[] { event });
} catch (Throwable e) {
throw new CommunicationException("method_invoke_error:" + methodName, e);
}
} else {
throw new CommunicationException("no_method_error for["
+ StringUtils.capitalize(event.getType().toString())
+ "] in Class[" + action.getClass().getName() + "]");
}
}
throw new CommunicationException("eventType_no_action", event.getType().name());
} catch (RuntimeException e) {
logger.error("endpoint_error", e);
throw e;
} catch (Exception e) {
logger.error("endpoint_error", e);
throw new CommunicationException(e);
}
}
}