alluxio.client.ClientContext.java Source code

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Here is the source code for alluxio.client.ClientContext.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.client;

import alluxio.Configuration;
import alluxio.PropertyKey;
import alluxio.metrics.MetricsSystem;

import com.google.common.base.Preconditions;

import java.net.InetSocketAddress;

import javax.annotation.concurrent.NotThreadSafe;

/**
 * A shared context in each client JVM. It provides common functionality such as the Alluxio
 * configuration and master address.
 */
@NotThreadSafe
public final class ClientContext {
    private static InetSocketAddress sMasterAddress;

    static {
        init();
    }

    /**
     * Initializes the client context singleton, bringing all non-Alluxio configuration state in sync
     * with the current Alluxio configuration.
     *
     * This method is useful for updating parts of {@link ClientContext} which depend on
     * {@link Configuration} when {@link Configuration} is changed, e.g. the master hostname or port.
     * This method requires that configuration has been initialized.
     */
    public static void init() {
        String masterHostname = Preconditions.checkNotNull(Configuration.get(PropertyKey.MASTER_HOSTNAME));
        int masterPort = Configuration.getInt(PropertyKey.MASTER_RPC_PORT);
        sMasterAddress = new InetSocketAddress(masterHostname, masterPort);

        MetricsSystem.startSinks();
    }

    /**
     * @return the master address
     */
    public static InetSocketAddress getMasterAddress() {
        return sMasterAddress;
    }

    private ClientContext() {
    } // prevent instantiation
}