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/* Copyright (c) 2009 Peter Troshin
*
* JAva Bioinformatics Analysis Web Services (JABAWS) @version: 1.0
*
* This library is free software; you can redistribute it and/or modify it under the terms of the
* Apache License version 2 as published by the Apache Software Foundation
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Apache
* License for more details.
*
* A copy of the license is in apache_license.txt. It is also available here:
* @see: http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Any republication or derived work distributed in source code form
* must include this copyright and license notice.
*/
package compbio.engine;
import java.util.Queue;
import java.util.concurrent.DelayQueue;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Logger;
import compbio.engine.client.PathValidator;
public final class PulledFileCache {
private static final Logger log = Logger.getLogger(PulledFileCache.class);
private static final Queue<FilePuller> CACHE = new DelayQueue<FilePuller>();
public static FilePuller get(final String fileName) {
assert PathValidator.isAbsolutePath(fileName);
for (FilePuller fp : CACHE) {
if (fp.getFile().equals(fileName)) {
log.debug("Retrieving element from cache: " + fp);
return fp;
}
}
return null;
}
/**
* This method allows duplicates to be added. This is a responsibility of
* the called to ensure this will not happen!
*
* @param fpuller
* @return true if the same filepooler is already in cache
*/
public static boolean put(final FilePuller fpuller) {
sweep();
log.debug("Adding element to cache: " + fpuller);
if (fpuller.getDelay(TimeUnit.NANOSECONDS) < 0) {
throw new IllegalArgumentException(
"Could not cache expired FilePullers! FilePuler: "
+ fpuller);
}
return CACHE.add(fpuller);
}
private static void sweep() {
FilePuller puller = null;
do {
// All elements with delay expired gets removed from cache here
puller = CACHE.poll();
if (puller != null) {
puller.disconnect();
log.debug("Removing element from cache: " + puller);
}
} while (puller != null);
}
static int getSize() {
return CACHE.size();
}
static void clear() {
CACHE.clear();
}
static void print() {
System.out.println(CACHE);
}
}
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