ShardingContext.java

/*
 * 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.api;

import com.dangdang.ddframe.job.executor.ShardingContexts;
import lombok.Getter;
import lombok.ToString;

/**
 * 分片上下文.
 * 
 * @author zhangliang
 */
@Getter
@ToString
public final class ShardingContext {
    
    /**
     * 作业名称.
     */
    private final String jobName;
    
    /**
     * 作业任务ID.
     */
    private final String taskId;
    
    /**
     * 分片总数.
     */
    private final int shardingTotalCount;
    
    /**
     * 作业自定义参数.
     * 可以配置多个相同的作业, 但是用不同的参数作为不同的调度实例.
     */
    private final String jobParameter;
    
    /**
     * 分配于本作业实例的分片项.
     */
    private final int shardingItem;
    
    /**
     * 分配于本作业实例的分片参数.
     */
    private final String shardingParameter;
    
    public ShardingContext(final ShardingContexts shardingContexts, final int shardingItem) {
        jobName = shardingContexts.getJobName();
        taskId = shardingContexts.getTaskId();
        shardingTotalCount = shardingContexts.getShardingTotalCount();
        jobParameter = shardingContexts.getJobParameter();
        this.shardingItem = shardingItem;
        shardingParameter = shardingContexts.getShardingItemParameters().get(shardingItem);
    }
}