java.fedora.server.journal.readerwriter.multifile.MultiFileFollowingJournalReader Maven / Gradle / Ivy
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/*
* -----------------------------------------------------------------------------
*
* License and Copyright: The contents of this file are subject to 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.fedora-commons.org/licenses.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The entire file consists of original code.
* Copyright © 2008 Fedora Commons, Inc.
*
Copyright © 2002-2007 The Rector and Visitors of the University of
* Virginia and Cornell University
* All rights reserved.
*
* -----------------------------------------------------------------------------
*/
package fedora.server.journal.readerwriter.multifile;
import java.util.Map;
import fedora.server.journal.JournalException;
import fedora.server.journal.ServerInterface;
import fedora.server.journal.recoverylog.JournalRecoveryLog;
/**
*
* Title: MultiFileFollowingJournalReader.java
*
*
* Description: A JournalReader implementation for "following" a leading
* server, when the leading server is using a {@link MultiFileJournalWriter},
* or the equivalent. The recovery is never complete, as the reader continues to
* poll for recently-created files, until the server shuts down.
*
*
* This class should likely be superceded by
* {@link LockingFollowingJournalReader}.
*
*
* @author [email protected]
* @version $Id: MultiFileFollowingJournalReader.java 6765 2008-03-09 20:24:44
* +0000 (Sun, 09 Mar 2008) j2blake $
* @deprecated Use {@link LockingFollowingJournalReader} instead.
*/
@Deprecated
public class MultiFileFollowingJournalReader
extends MultiFileJournalReader {
private final long pollingIntervalMillis;
/**
* Do the super-class constructor, and then find the polling interval.
*/
public MultiFileFollowingJournalReader(Map parameters,
String role,
JournalRecoveryLog recoveryLog,
ServerInterface server)
throws JournalException {
super(parameters, role, recoveryLog, server);
pollingIntervalMillis =
MultiFileJournalHelper
.parseParametersForPollingInterval(parameters);
}
/**
* Ask for a new file, using the superclass method, but if none is found,
* wait for a while and ask again. This will continue until we get a server
* shutdown signal.
*/
@Override
protected synchronized JournalInputFile openNextFile()
throws JournalException {
while (open) {
JournalInputFile nextFile = super.openNextFile();
if (nextFile != null) {
return nextFile;
}
try {
wait(pollingIntervalMillis);
} catch (InterruptedException e) {
// no special action on interrupt.
}
}
return null;
}
/**
* If the server requests a shutdown, stop waiting the next file to come in.
*/
@Override
public synchronized void shutdown() throws JournalException {
super.shutdown();
notifyAll();
}
}