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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.derby;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.util.logging.Level;
import org.apache.derby.drda.NetworkServerControl;
import org.eclipse.osee.framework.derby.internal.Activator;
import org.eclipse.osee.framework.logging.OseeLog;
/**
* @author Roberto E. Escobar
*/
public class DerbyDbServer {
protected static Object keepAlive;
private NetworkServerUtil nwServer;
private static final DerbyDbServer instance = new DerbyDbServer();
private DerbyDbServer() {
this.nwServer = null;
}
public static void startServer(String host, int port) throws Exception {
instance.startServerInternal(host, port);
}
private void startServerInternal(String host, int port) throws Exception {
try {
OseeLog.log(Activator.class, Level.INFO, "Starting Derby Network Server ....");
nwServer = new NetworkServerUtil(InetAddress.getByName(host), port);
nwServer.start();
if (isConnectionAvailable()) {
nwServer.printInfo();
addShutdownHook();
// stayAlive();
} else {
OseeLog.log(Activator.class, Level.INFO, "Exiting, since unable to connect to Derby Network Server.");
OseeLog.log(Activator.class, Level.INFO,
"Please try to increase the amount of time to keep trying to connect to the Server.");
}
} catch (Exception ex) {
OseeLog.log(Activator.class, Level.SEVERE, ex);
}
}
private void stayAlive() {
keepAlive = new Object();
synchronized (keepAlive) {
try {
keepAlive.wait();
} catch (InterruptedException e) {
OseeLog.log(Activator.class, Level.SEVERE, e.getMessage(), e);
}
}
}
private void commitSuicide() {
if (keepAlive != null) {
synchronized (keepAlive) {
keepAlive.notify();
}
}
}
private void shutdown() {
OseeLog.log(Activator.class, Level.INFO, "Shutting down network server...");
nwServer.shutdown();
OseeLog.log(Activator.class, Level.INFO, "Server down.");
commitSuicide();
}
private void addShutdownHook() {
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
OseeLog.log(Activator.class, Level.INFO, "Shutting down");
shutdown();
}
});
}
private boolean isConnectionAvailable() throws InterruptedException {
boolean knowIfServerUp = false;
int numTimes = 5;
while (!knowIfServerUp && numTimes > 0) {
try {
numTimes--;
nwServer.testForConnection();
knowIfServerUp = true;
} catch (Exception e) {
OseeLog.log(Activator.class, Level.SEVERE,
"Unable to obtain a connection to network server, trying again after 3000 ms.", e);
Thread.sleep(3000);
}
}
return knowIfServerUp;
}
// public static void main(String[] args) throws Exception {
// (new DBServer( new PrintWriter(System.out, true)).startServer(args);
// }
private final class NetworkServerUtil {
private NetworkServerControl serverControl;
public NetworkServerUtil(InetAddress host, int port) {
try {
serverControl = new NetworkServerControl(host, port);
OseeLog.log(Activator.class, Level.INFO, "Derby Network Server created");
} catch (Exception e) {
OseeLog.log(Activator.class, Level.SEVERE, "Error Initializing Server Control.", e);
}
}
/**
* trace utility of server
*/
public void trace(boolean onoff) {
try {
serverControl.trace(onoff);
} catch (Exception e) {
OseeLog.log(Activator.class, Level.SEVERE, e.getMessage(), e);
}
}
/**
* Try to test for a connection Throws exception if unable to get a connection
*/
public void testForConnection() throws Exception {
serverControl.ping();
}
/**
* Shutdown the NetworkServer
*/
public void shutdown() {
try {
serverControl.shutdown();
} catch (Exception e) {
OseeLog.log(Activator.class, Level.SEVERE, e.getMessage(), e);
}
}
/**
* Start Derby Network server
*/
public void start() {
try {
serverControl.start(new PrintWriter(System.out, true));
} catch (Exception e) {
OseeLog.log(Activator.class, Level.SEVERE, e.getMessage(), e);
}
}
public void printInfo() {
try {
String sysinfo = serverControl.getSysinfo();
int start = sysinfo.indexOf("Java classpath:");
int stop = sysinfo.indexOf("OS name:");
String cpSubString = sysinfo.substring(start, stop);
cpSubString = cpSubString.replaceAll(";", ";\n\t");
String temp = sysinfo.substring(0, start) + cpSubString + sysinfo.substring(stop, sysinfo.length());
OseeLog.log(Activator.class, Level.INFO, temp);
} catch (Exception ex) {
OseeLog.log(Activator.class, Level.SEVERE, "Error getting Server Information", ex);
}
}
}
}
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