io.hops.ha.common.TransactionState.java Source code

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Here is the source code for io.hops.ha.common.TransactionState.java

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/*
 * Copyright (C) 2015 hops.io.
 *
 * 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 io.hops.ha.common;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;

public abstract class TransactionState {

    //TODO: Should we persist this id when the RT crashes and the NM starts 
    //sending HBs to the new RT?
    protected static AtomicInteger pendingEventId = new AtomicInteger(0);

    public enum TransactionType {

        RM, APP, NODE
    }

    private static final Log LOG = LogFactory.getLog(TransactionState.class);
    private int counter = 1;
    protected int rpcID;

    public TransactionState(int rpcID) {
        this.rpcID = rpcID;
    }

    public synchronized void incCounter(Enum type) {
        counter++;
        LOG.debug("counter inc for rpc: " + this.rpcID + " count " + counter + " type: " + type + " classe:"
                + type.getClass());
    }

    public synchronized void decCounter(Enum type) throws IOException {
        counter--;
        LOG.debug("counter dec for rpc: " + this.rpcID + " count " + counter + " type: " + type + " classe:"
                + type.getClass());
        if (counter == 0) {
            commit();
        }
    }

    public synchronized void decCounter(String type) throws IOException {
        counter--;
        LOG.debug("counter dec for rpc: " + this.rpcID + " count " + counter + " type: " + type);
        if (counter == 0) {
            commit();
        }
    }

    public int getId() {
        return rpcID;
    }

    abstract void commit() throws IOException;
}