Mercurial > hg > blitz_condensed
diff src/org/dancres/blitz/tools/SyncAndShutdown.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/dancres/blitz/tools/SyncAndShutdown.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,141 @@ +package org.dancres.blitz.tools; + +import java.io.IOException; + +import java.rmi.RemoteException; +import java.rmi.RMISecurityManager; + +import net.jini.discovery.*; + +import net.jini.lookup.*; +import net.jini.lookup.entry.Name; + +import net.jini.core.lookup.ServiceItem; +import net.jini.core.lookup.ServiceTemplate; + +import net.jini.core.entry.Entry; + +import net.jini.admin.Administrable; + +import net.jini.space.JavaSpace; + +import net.jini.core.transaction.TransactionException; + +import org.dancres.blitz.remote.BlitzAdmin; + +import org.dancres.jini.util.DiscoveryUtil; +import org.dancres.jini.util.ServiceLocator; + +/** + <p>SyncAndShutdown accepts a spacename as an argument and attempts to + shut it down cleanly having sync'd it's contents to disk (this second + step isn't strictly necessary but does ensure that all state is available + from the underlying databases without any dependency on the log files). + This tool will only work with a Blitz JavaSpace owing to it's dependence + upon the <code>BlitzAdmin</code> interface.</p> + + <p>Once a Blitz instance has been shutdown in this manner, one may, for + example, use <code>DumpEntries</code> to examine it's Entry content.</p> + + <p>Typical usage: + + <pre> + java -Xmx256m -Djava.security.policy=config/policy.all + -classpath /home/dan/jini/jini2_0/lib/jsk-platform.jar:/home/dan/src/jini/space/build:/home/dan/jini/jini2_0/lib/jini-ext.jar:/home/dan/jini/jini2_0/lib/sun-util.jar + org.dancres.blitz.tools.SyncAndShutdown dancres + </pre> + + <p>This tool is non-destructive so it's perfectly possible to shut a + Blitz instance down, run <code>DumpEntries</code> and then restart the + space.</p> + + <p>Note if there are active transactions, Blitz will by default refuse + to honour the request. You can force Blitz to shutdown by adding + <code>-Dforce=true</code> to the command-line(s) above.</p> + + @see org.dancres.blitz.remote.BlitzAdmin + @see org.dancres.blitz.tools.DumpEntries + */ +public class SyncAndShutdown { + private static final long MAX_DISCOVER_TIME = 15 * 1000; + + public static void main(String args[]) { + if (System.getSecurityManager() == null) + System.setSecurityManager(new RMISecurityManager()); + + boolean amForced = Boolean.getBoolean("force"); + + try { + try { + Object myProxy = null; + + if (args.length == 1) + myProxy = ServiceLocator.getService(JavaSpace.class, + args[0], + MAX_DISCOVER_TIME); + else if (args.length == 2) { + myProxy = ServiceLocator.getService(args[0], + JavaSpace.class, + args[1]); + } else { + System.err.println("Wrong number of arguments - should be <spacename> or <LUS host> <spacename>"); + System.exit(-1); + } + + if (myProxy != null) { + System.err.println("Found space: " + myProxy); + + DiscoveryUtil.dumpInterfaces(myProxy.getClass()); + + if (DiscoveryUtil.hasInterface(myProxy, + Administrable.class)) { + Administrable myAdmin = (Administrable) myProxy; + + Object myAdminProxy = myAdmin.getAdmin(); + + DiscoveryUtil.dumpInterfaces(myAdminProxy.getClass()); + + if (DiscoveryUtil.hasInterface(myAdminProxy, + BlitzAdmin.class)) { + BlitzAdmin myBlitzAdmin = + (BlitzAdmin) myAdminProxy; + + try { + System.err.println("Invoking checkpoint"); + myBlitzAdmin.requestSnapshot(); + } catch (TransactionException aTE) { + System.err.println("Failed to checkpoint"); + aTE.printStackTrace(System.err); + + if (amForced) { + System.err.println("Ignoring checkpoint " + + "failure and forcing shutdown"); + } else { + System.exit(-1); + } + } + + System.err.println("Invoking shutdown"); + myBlitzAdmin.shutdown(); + } else { + System.err.println("No BlitzAdmin interface found - can't be Blitz"); + } + } else { + System.err.println("No admin interface present - can't be Blitz"); + } + } + } catch (InterruptedException anIE) { + System.err.println("!!! Whoops service not found :( !!!"); + } + } catch (ClassNotFoundException aCNFE) { + System.err.println("ClassNotFound exception"); + aCNFE.printStackTrace(System.err); + } catch (RemoteException anRE) { + System.err.println("Remote exception"); + anRE.printStackTrace(System.err); + } catch (IOException anIOE) { + System.err.println("Failed to configure discovery"); + anIOE.printStackTrace(System.err); + } + } +}