io.hops.leaderElection.experiments.LightWeightNameNode.java Source code

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Here is the source code for io.hops.leaderElection.experiments.LightWeightNameNode.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.leaderElection.experiments;

import io.hops.leaderElection.LeaderElection;
import io.hops.leader_election.node.SortedActiveNodeList;
import io.hops.metadata.election.entity.LeDescriptorFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Light weight NameNode class used for testing the Leader
 * Election Protocol
 */
public class LightWeightNameNode {

    private static final Log LOG = LogFactory.getLog(LightWeightNameNode.class);
    protected LeaderElection leaderElection;

    public LightWeightNameNode(LeDescriptorFactory ldf, final long time_period, final int max_missed_hb_threshold,
            final long time_period_increment, final String http_address, final String rpc_address)
            throws IOException, CloneNotSupportedException {
        leaderElection = new LeaderElection(ldf, time_period, max_missed_hb_threshold, time_period_increment,
                http_address, rpc_address);
        leaderElection.start();
        LOG.debug("NameNode has started");
    }

    public long getLeCurrentId() {
        return leaderElection.getCurrentId();
    }

    public boolean isLeader() {
        return leaderElection.isLeader();
    }

    public void stop() {
        if (!leaderElection.isStopped()) {
            try {
                leaderElection.stopElectionThread();
            } catch (InterruptedException e) {
                LOG.warn("LeaderElection stopped", e);
            }
        }
    }

    public LeaderElection getLeaderElectionInstance() {
        return leaderElection;
    }

    public InetSocketAddress getNameNodeAddress() {
        Pattern p = Pattern.compile("^\\s*(.*?):(\\d+)\\s*$");
        Matcher m = p.matcher(leaderElection.getRpcAddress());
        if (m.matches()) {
            String host = m.group(1);
            int port = Integer.parseInt(m.group(2));
            return new InetSocketAddress(host, port);
        } else {
            return null;
        }
    }

    public SortedActiveNodeList getActiveNameNodes() {
        return leaderElection.getActiveNamenodes();
    }

    public long getLeTimePeriod() {
        return leaderElection.getCurrentTimePeriod();
    }
}