io.hops.common.IDsMonitor.java Source code

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Here is the source code for io.hops.common.IDsMonitor.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.common;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;

import java.io.IOException;

public class IDsMonitor implements Runnable {

    private static final Log LOG = LogFactory.getLog(IDsMonitor.class);
    private static IDsMonitor instance = null;
    private Thread th = null;

    private int checkInterval;

    private IDsMonitor() {
    }

    public static IDsMonitor getInstance() {
        if (instance == null) {
            instance = new IDsMonitor();
        }
        return instance;
    }

    public void setConfiguration(Configuration conf) {
        IDsGeneratorFactory.getInstance().setConfiguration(
                conf.getInt(DFSConfigKeys.DFS_NAMENODE_INODEID_BATCH_SIZE,
                        DFSConfigKeys.DFS_NAMENODE_INODEID_BATCH_SIZE_DEFAULT),
                conf.getInt(DFSConfigKeys.DFS_NAMENODE_BLOCKID_BATCH_SIZE,
                        DFSConfigKeys.DFS_NAMENODE_BLOCKID_BATCH_SIZE_DEFAULT),
                conf.getInt(DFSConfigKeys.DFS_NAMENODE_QUOTA_UPDATE_ID_BATCH_SIZE,
                        DFSConfigKeys.DFS_NAMENODE_QUOTA_UPDATE_ID_BATCH_SIZ_DEFAULT),
                conf.getInt(DFSConfigKeys.DFS_NAMENODE_CACHE_DIRECTIVE_ID_BATCH_SIZE,
                        DFSConfigKeys.DFS_NAMENODE_CACHE_DIRECTIVE_ID_BATCH_SIZE_DEFAULT),
                conf.getFloat(DFSConfigKeys.DFS_NAMENODE_INODEID_UPDATE_THRESHOLD,
                        DFSConfigKeys.DFS_NAMENODE_INODEID_UPDATE_THRESHOLD_DEFAULT),
                conf.getFloat(DFSConfigKeys.DFS_NAMENODE_BLOCKID_UPDATE_THRESHOLD,
                        DFSConfigKeys.DFS_NAMENODE_BLOCKID_UPDATE_THRESHOLD_DEFAULT),
                conf.getFloat(DFSConfigKeys.DFS_NAMENODE_QUOTA_UPDATE_ID_UPDATE_THRESHOLD,
                        DFSConfigKeys.DFS_NAMENODE_QUOTA_UPDATE_ID_UPDATE_THRESHOLD_DEFAULT),
                conf.getFloat(DFSConfigKeys.DFS_NAMENODE_CACHE_DIRECTIVE_ID_UPDATE_THRESHOLD,
                        DFSConfigKeys.DFS_NAMENODE_CACHE_DIRECTIVE_ID_UPDATE_THRESHOLD_DEFAULT));

        checkInterval = conf.getInt(DFSConfigKeys.DFS_NAMENODE_IDSMONITOR_CHECK_INTERVAL_IN_MS,
                DFSConfigKeys.DFS_NAMENODE_IDSMONITOR_CHECK_INTERVAL_IN_MS_DEFAULT);
    }

    public void start() {
        getNewIds(); // Avoid race conditions between operations and the first acquisition of ids
        th = new Thread(this, "IDsMonitor");
        th.setDaemon(true);
        th.start();
    }

    @Override
    public void run() {
        while (true) {
            getNewIds();
        }
    }

    private void getNewIds() {
        try {

            IDsGeneratorFactory.getInstance().getNewIDs();

            Thread.sleep(checkInterval);
        } catch (InterruptedException ex) {
            LOG.warn("IDsMonitor interrupted: " + ex);
        } catch (IOException ex) {
            LOG.warn("IDsMonitor got exception: " + ex);
        }
    }
}