/*
 * Copyright 1999-2015 dangdang.com.
 * <p>
 * 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.
 * </p>
 */

package com.dangdang.ddframe.job.event;

import com.dangdang.ddframe.env.LocalHostService;
import lombok.Getter;
import lombok.RequiredArgsConstructor;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.UUID;

/**
 * 作业执行事件.
 *
 * @author zhangliang
 */
@RequiredArgsConstructor
@Getter
public class JobExecutionEvent implements JobEvent {
    
    private static LocalHostService localHostService = new LocalHostService();
    
    private final String id = UUID.randomUUID().toString();
    
    private final String hostname = localHostService.getHostName();
    
    private final String jobName;
    
    private final ExecutionSource source;
    
    private final int shardingItem;
    
    private final Date startTime = new Date();
    
    private Date completeTime;
    
    private boolean success;
    
    private Throwable failureCause;
    
    /**
     * 作业执行成功.
     */
    public void executionSuccess() {
        completeTime = new Date();
        success = true;
    }
    
    /**
     * 作业执行失败.
     * 
     * @param failureCause 失败原因
     */
    public void executionFailure(final Throwable failureCause) {
        completeTime = new Date();
        this.failureCause = failureCause;
    }
    
    /**
     * 获取失败原因.
     * @return 失败原因
     */
    public String getFailureCause() {
        if (null == failureCause) {
            return "";
        }
        StringWriter result = new StringWriter();
        try (PrintWriter writer = new PrintWriter(result)) {
            failureCause.printStackTrace(writer);
        }
        return result.toString();
    }
    
    /**
     * 执行来源.
     */
    public enum ExecutionSource {
        NORMAL_TRIGGER, MISFIRE, FAILOVER
    }
}

@@ -1413,16 +1413,25 @@
 private 
+volatile 
 Date com

refactor event for concurrency