de.micromata.genome.chronos.spi.HostUtils.java Source code

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Here is the source code for de.micromata.genome.chronos.spi.HostUtils.java

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//
// Copyright (C) 2010-2016 Micromata GmbH
//
// 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.
//

/*
 Created on 08.01.2008
 */
package de.micromata.genome.chronos.spi;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.rmi.dgc.VMID;
import java.util.Date;

import org.apache.commons.lang3.StringUtils;

/**
 * Dealing with local machine information.
 * 
 * @author roger
 */
public class HostUtils {

    /**
     * The run context name.
     */
    private static ThreadLocal<String> runContextName = new ThreadLocal<String>();

    /**
     * The hostname.
     */
    private static String HOSTNAME;

    /**
     * The start time.
     */
    private static long START_TIME;

    /**
     * The Constant VM.
     */
    private static final String VM = new VMID().toString();

    static {
        START_TIME = new Date().getTime();
        try {
            HOSTNAME = InetAddress.getLocalHost().getHostName();
        } catch (final UnknownHostException ex) {
            HOSTNAME = "UnkownHost: " + new VMID().toString();
        }
    }

    public String getHostName() {
        return HOSTNAME;
    }

    /**
     * Enables settings of hostname within spring context (ref. genome logging).
     * 
     * @param hostName May <code>null</code>
     * 
     */
    public void setHostName(String hostName) {
        hostName = StringUtils.trimToNull(hostName);
        if (hostName != null) {
            HOSTNAME = hostName;
        }
    }

    public static String getThisHostName() {
        return HOSTNAME;
    }

    /**
     * This method should only be called in test code
     * 
     * @param hostname the hostname to set
     */
    public static void setThisHostName(String hostname) {
        HOSTNAME = hostname;
    }

    public static String getVm() {
        return VM;
    }

    public static long getStartTime() {
        return START_TIME;
    }

    public static String getNodeName() {
        return HOSTNAME;
    }

    /**
     * Gets the run context.
     *
     * @param thread the thread
     * @return the run context
     */
    public static String getRunContext(Thread thread) {
        String tid = "-1";
        if (thread != null) {
            tid = Long.toHexString(thread.getId());
        }
        String time = Long.toHexString(START_TIME / 1000);
        String t = time + ';' + tid;
        return t;
    }

    public static String getRunContext() {
        if (runContextName.get() != null) {
            return runContextName.get();
        }
        String t = getRunContext(Thread.currentThread());
        runContextName.set(t);
        return t;
    }
}