jstorm-core/src/main/java/com/alibaba/jstorm/batch/BatchId.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.jstorm.batch;

import java.io.Serializable;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

public class BatchId implements Serializable {
    private static final long serialVersionUID = 5720810158625748049L;
    protected final long id;

    protected BatchId(long id) {
        this.id = id;
    }

    public long getId() {
        return id;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + (int) (id ^ (id >>> 32));
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        BatchId other = (BatchId) obj;
        if (id != other.id)
            return false;
        return true;
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
    }

    private static AtomicLong staticId = new AtomicLong(0);

    public static void updateId(long id) {
        staticId.set(id);
    }

    public static BatchId mkInstance() {
        long id = staticId.incrementAndGet();

        return new BatchId(id);
    }

    public static BatchId incBatchId(BatchId old) {
        long other = old.getId();
        return new BatchId(other + 1);
    }

}