co.cask.tephra.inmemory.InMemoryTransactionService.java Source code

Introduction

Here is the source code for co.cask.tephra.inmemory.InMemoryTransactionService.java

Source

/*
 * Copyright  2012-2014 Cask Data, Inc.
 *
 * 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 co.cask.tephra.inmemory;

import co.cask.tephra.TransactionManager;
import co.cask.tephra.TxConstants;
import com.google.common.util.concurrent.AbstractService;
import com.google.inject.Inject;
import com.google.inject.Provider;
import org.apache.hadoop.conf.Configuration;
import org.apache.twill.common.Cancellable;
import org.apache.twill.discovery.Discoverable;
import org.apache.twill.discovery.DiscoveryService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetSocketAddress;

/**
 * Transaction server that manages transaction data for the Reactor.
 * <p>
 *   Transaction server is HA, one can start multiple instances, only one of which is active and will register itself in
 *   discovery service.
 * </p>
 */
public class InMemoryTransactionService extends AbstractService {
    private static final Logger LOG = LoggerFactory.getLogger(InMemoryTransactionService.class);

    private final DiscoveryService discoveryService;
    private final String serviceName;
    protected final Provider<TransactionManager> txManagerProvider;
    private Cancellable cancelDiscovery;
    protected TransactionManager txManager;

    // thrift server config
    protected final String address;
    protected final int port;
    protected final int threads;
    protected final int ioThreads;
    protected final int maxReadBufferBytes;

    @Inject
    public InMemoryTransactionService(Configuration conf, DiscoveryService discoveryService,
            Provider<TransactionManager> txManagerProvider) {

        this.discoveryService = discoveryService;
        this.txManagerProvider = txManagerProvider;
        this.serviceName = conf.get(TxConstants.Service.CFG_DATA_TX_DISCOVERY_SERVICE_NAME,
                TxConstants.Service.DEFAULT_DATA_TX_DISCOVERY_SERVICE_NAME);

        address = conf.get(TxConstants.Service.CFG_DATA_TX_BIND_ADDRESS,
                TxConstants.Service.DEFAULT_DATA_TX_BIND_ADDRESS);
        port = conf.getInt(TxConstants.Service.CFG_DATA_TX_BIND_PORT,
                TxConstants.Service.DEFAULT_DATA_TX_BIND_PORT);

        // Retrieve the number of threads for the service
        threads = conf.getInt(TxConstants.Service.CFG_DATA_TX_SERVER_THREADS,
                TxConstants.Service.DEFAULT_DATA_TX_SERVER_THREADS);
        ioThreads = conf.getInt(TxConstants.Service.CFG_DATA_TX_SERVER_IO_THREADS,
                TxConstants.Service.DEFAULT_DATA_TX_SERVER_IO_THREADS);

        maxReadBufferBytes = conf.getInt(TxConstants.Service.CFG_DATA_TX_THRIFT_MAX_READ_BUFFER,
                TxConstants.Service.DEFAULT_DATA_TX_THRIFT_MAX_READ_BUFFER);

        LOG.info("Configuring TransactionService" + ", address: " + address + ", port: " + port + ", threads: "
                + threads + ", io threads: " + ioThreads + ", max read buffer (bytes): " + maxReadBufferBytes);
    }

    protected void undoRegister() {
        if (cancelDiscovery != null) {
            cancelDiscovery.cancel();
        }
    }

    protected void doRegister() {
        cancelDiscovery = discoveryService.register(new Discoverable() {
            @Override
            public String getName() {
                return serviceName;
            }

            @Override
            public InetSocketAddress getSocketAddress() {
                return getAddress();
            }
        });
    }

    protected InetSocketAddress getAddress() {
        return new InetSocketAddress(1);
    }

    @Override
    protected void doStart() {
        try {
            txManager = txManagerProvider.get();
            txManager.startAndWait();
            doRegister();
            LOG.info("Transaction Thrift service started successfully on " + getAddress());
            notifyStarted();
        } catch (Throwable t) {
            LOG.info("Transaction Thrift service didn't start on " + getAddress());
            notifyFailed(t);
        }
    }

    @Override
    protected void doStop() {
        undoRegister();
        txManager.stopAndWait();
        notifyStopped();
    }

}