Revision 2572
Added by Jing Tao over 18 years ago
| src/edu/ucsb/nceas/metacat/MetacatReplication.java | ||
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import edu.ucsb.nceas.dbadapter.AbstractDatabase; |
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import java.util.*; |
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import java.util.Date; |
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import java.io.*; |
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import java.sql.*; |
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import java.net.*; |
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public class MetacatReplication extends HttpServlet implements Runnable |
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{
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private String deltaT; |
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private long timeInterval; |
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private Date firstTime; |
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private boolean timedReplicationIsOn = false; |
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Timer replicationDaemon; |
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private static MetaCatUtil util = new MetaCatUtil(); |
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private Vector fileLocks = new Vector(); |
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private Thread lockThread = null; |
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private static final AbstractDatabase dbAdapter = MetaCatUtil.dbAdapter; |
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public static final String FORCEREPLICATEDELETE = "forcereplicatedelete"; |
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private static final String TIMEREPLICATION = "timedreplication"; |
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private static final String TIMEREPLICATIONINTERVAl = "timedreplicationinterval"; |
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private static final String FIRSTTIME = "firsttimedreplication"; |
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private static final int TIMEINTERVALLIMIT = 7200000; |
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/** |
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* Initialize the servlet by creating appropriate database connections |
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*/ |
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{
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//initialize db connections to handle any update requests |
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MetaCatUtil util = new MetaCatUtil(); |
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deltaT = util.getOption("deltaT");
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//deltaT = util.getOption("deltaT");
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//the default deltaT can be set from metacat.properties |
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//create a thread to do the delta-T check but don't execute it yet |
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replicationDaemon = new Timer(true); |
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/*java.net.URL.setURLStreamHandlerFactory( |
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new java.net.URLStreamHandlerFactory() |
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try |
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{
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timedReplicationIsOn = (new Boolean(util.getOption(TIMEREPLICATION ).trim())).booleanValue(); |
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MetaCatUtil.debugMessage("The timed replication on is"+timedReplicationIsOn, 30);
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timeInterval = (new Long(util.getOption(TIMEREPLICATIONINTERVAl).trim())).longValue(); |
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MetaCatUtil.debugMessage("The timed replication time Inerval is "+ timeInterval, 20);
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String firstTimeStr = util.getOption(FIRSTTIME); |
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MetaCatUtil.debugMessage("first replication time form property is "+firstTimeStr, 20);
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firstTime = ReplicationHandler.combinateCurrentDateAndGivenTime(firstTimeStr); |
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MetaCatUtil.debugMessage("After combine current time, the real first time is "
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+firstTime.toString()+" minisec", 20); |
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// set up time replication if it is on |
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if (timedReplicationIsOn) |
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{
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public java.net.URLStreamHandler createURLStreamHandler( |
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final String protocol) |
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{
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if ("http".equals(protocol))
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{
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try |
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{
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URLStreamHandler urlsh = new HTTPClient.http.Handler(); |
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MetaCatUtil.debugMessage("Using HttpClient Protocol Handler for http", 45);
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return urlsh; |
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} |
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catch (Exception e) |
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{
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MetaCatUtil.debugMessage( |
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"Error setting URL StreamHandler!", 30); |
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return null; |
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} |
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}//if |
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else if ("https".equals(protocol))
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{
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try |
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{
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URLStreamHandler urlsh = new HTTPClient.https.Handler(); |
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MetaCatUtil.debugMessage("Using HttpClient Protocol Handler for https", 45);
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return urlsh; |
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} |
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catch (Exception e) |
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{
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MetaCatUtil.debugMessage( |
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"Error setting URL StreamHandler!", 30); |
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return null; |
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} |
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} |
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return null; |
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}//createURLStreamHandler |
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});*/ |
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replicationDaemon.scheduleAtFixedRate(new ReplicationHandler(), firstTime, timeInterval); |
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MetacatReplication.replLog("deltaT handler started with rate=" +
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timeInterval + " mini seconds at " +firstTime.toString()); |
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} |
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} |
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catch (Exception e) |
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{
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// the timed replication in Metacat.properties file has problem |
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// so timed replication is setting to false; |
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MetaCatUtil.debugMessage("Couldn't set up timed replication "+
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" in Metacat replication servlet init because " + |
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e.getMessage(), 20); |
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MetacatReplication.replErrorLog("Couldn't set up timed replication "+
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" in Metacat replication servlet init because " + |
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e.getMessage()); |
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timedReplicationIsOn = false; |
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} |
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} |
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public void destroy() |
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{
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replicationDaemon.cancel(); |
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// System.out.println("Replication daemon cancelled.");
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} |
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public void doGet (HttpServletRequest request, HttpServletResponse response) |
| ... | ... | |
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//stop the replication server |
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replicationDaemon.cancel(); |
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replicationDaemon = new Timer(true); |
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timedReplicationIsOn = false; |
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MetaCatUtil.setOption(TIMEREPLICATION, (new Boolean(timedReplicationIsOn)).toString()); |
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out.println("Replication Handler Stopped");
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MetacatReplication.replLog("deltaT handler stopped");
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} else if ( action.equals("start") ) {
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String firstTimeStr = ""; |
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//start the replication server |
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int rate;
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if ( params.containsKey("rate") ) {
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rate = new Integer(
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new String(((String[])params.get("rate"))[0])).intValue();
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if(rate < 30) {
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out.println("Replication deltaT rate cannot be less than 30!");
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if ( params.containsKey("rate") ) {
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timeInterval = new Long(
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new String(((String[])params.get("rate"))[0])).longValue();
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if(timeInterval < TIMEINTERVALLIMIT) {
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out.println("Replication deltaT rate cannot be less than "+
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TIMEINTERVALLIMIT + " millisecs and system automatically setup the rate to "+TIMEINTERVALLIMIT);
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//deltaT<30 is a timing mess! |
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rate = 1000;
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timeInterval = TIMEINTERVALLIMIT;
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} |
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} else {
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rate = 1000;
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timeInterval = TIMEINTERVALLIMIT ;
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} |
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out.println("New rate is: " + rate + " seconds.");
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MetaCatUtil.debugMessage("New rate is: " + timeInterval + " mini seconds.", 30);
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if ( params.containsKey("firsttime"))
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{
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firstTimeStr = ((String[])params.get("firsttime"))[0];
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try |
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{
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firstTime = ReplicationHandler.combinateCurrentDateAndGivenTime(firstTimeStr); |
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MetaCatUtil.debugMessage("The first time setting is "+firstTime.toString(), 30);
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} |
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catch (Exception e) |
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{
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throw new ServletException(e.getMessage()); |
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} |
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MetaCatUtil.debugMessage("After combine current time, the real first time is "
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+firstTime.toString()+" minisec", 20); |
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} |
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else |
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{
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MetacatReplication.replErrorLog("You should specify the first time " +
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"to start a time replication"); |
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MetaCatUtil.debugMessage("You should specify the first time " +
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"to start a time replication", 30); |
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return; |
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} |
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timedReplicationIsOn = true; |
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// save settings to property file |
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MetaCatUtil.setOption(TIMEREPLICATION, (new Boolean(timedReplicationIsOn)).toString()); |
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// note we couldn't use firstTime object because it has date info |
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// we only need time info such as 10:00 PM |
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MetaCatUtil.setOption(FIRSTTIME, firstTimeStr); |
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MetaCatUtil.setOption(TIMEREPLICATIONINTERVAl, (new Long(timeInterval)).toString()); |
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replicationDaemon.cancel(); |
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replicationDaemon = new Timer(true); |
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replicationDaemon.scheduleAtFixedRate(new ReplicationHandler(out), 0,
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rate * 1000);
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replicationDaemon.scheduleAtFixedRate(new ReplicationHandler(), firstTime,
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timeInterval);
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out.println("Replication Handler Started");
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MetacatReplication.replLog("deltaT handler started with rate=" +
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rate + " seconds");
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timeInterval + " milliseconds at " +firstTime.toString());
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} else if ( action.equals("getall") ) {
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//updates this server exactly once |
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replicationDaemon.schedule(new ReplicationHandler(out), 0);
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replicationDaemon.schedule(new ReplicationHandler(), 0); |
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response.setContentType("text/html");
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out.println("<html><body>\"Get All\" Done</body></html>");
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|
Also available in: Unified diff
Persistant timed replication parameter.