com.pinterest.rocksplicator.controller.util.AdminClientFactory.java Source code

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Here is the source code for com.pinterest.rocksplicator.controller.util.AdminClientFactory.java

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/*
 *  Copyright 2017 Pinterest, 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 com.pinterest.rocksplicator.controller.util;

import com.pinterest.rocksdb_admin.thrift.Admin;
import com.pinterest.rocksplicator.controller.bean.HostBean;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetSocketAddress;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

/**
 * Factory class to generate clients to rocksdb_admin.
 *
 * @author Ang Xu (angxu@pinterest.com)
 */
public class AdminClientFactory {
    private static final Logger LOG = LoggerFactory.getLogger(AdminClientFactory.class);

    private final Lifecycle lifecycle;
    private final LoadingCache<InetSocketAddress, TTransport> clientPool;

    /**
     * Constructor of AdminClientFactory
     *
     * @param idleTimeout socket idle timeout in seconds
     */
    public AdminClientFactory(long idleTimeout) {
        lifecycle = new Lifecycle();
        clientPool = CacheBuilder.newBuilder().expireAfterAccess(idleTimeout, TimeUnit.SECONDS)
                .removalListener(lifecycle).build(lifecycle);
    }

    public Admin.Client getClient(InetSocketAddress addr) throws ExecutionException {
        try {
            TTransport transport = clientPool.get(addr);
            if (!transport.isOpen()) {
                clientPool.invalidate(addr);
                transport = clientPool.get(addr);
            }
            return new Admin.Client(new TBinaryProtocol(transport));
        } catch (ExecutionException ex) {
            LOG.error("Failed to get client for {}.", addr, ex);
            throw ex;
        }
    }

    public Admin.Client getClient(HostBean host) throws ExecutionException {
        return getClient(new InetSocketAddress(host.getIp(), host.getPort()));
    }

    public void shutdown() {
        clientPool.invalidateAll();
    }

    @VisibleForTesting
    LoadingCache<InetSocketAddress, TTransport> getClientPool() {
        return clientPool;
    }

    public static class Lifecycle extends CacheLoader<InetSocketAddress, TTransport>
            implements RemovalListener<InetSocketAddress, TTransport> {

        @Override
        public TTransport load(InetSocketAddress key) throws Exception {
            TSocket sock = new TSocket(key.getHostName(), key.getPort());
            sock.setConnectTimeout(5000);
            sock.open();
            return sock;
        }

        @Override
        public void onRemoval(RemovalNotification<InetSocketAddress, TTransport> notification) {
            notification.getValue().close();
        }
    }

}