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/*-
* ============LICENSE_START======================================================================
* Copyright (C) 2019 Nordix Foundation. All rights reserved.
* ===============================================================================================
* Licensed under 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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
* ============LICENSE_END========================================================================
*/
package org.onap.dcaegen2.collectors.datafile.service;
import java.nio.file.Path;
import java.time.Instant;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* A cache of all files that already has been published. Key is the local file path and the value is a time stamp, when
* the key was last used.
*/
public class PublishedFileCache {
private final Map<Path, Instant> publishedFiles = new HashMap<>();
/**
* Adds a file to the cache.
*
* @param path the name of the file to add.
* @return <code>null</code> if the file is not already in the cache.
*/
public synchronized Instant put(Path path) {
return publishedFiles.put(path, Instant.now());
}
/**
* Removes a file from the cache.
*
* @param localFileName name of the file to remove.
*/
public synchronized void remove(Path localFileName) {
publishedFiles.remove(localFileName);
}
/**
* Removes files 24 hours older than the given instant.
*
* @param now the instant will determine which files that will be purged.
*/
public synchronized void purge(Instant now) {
for (Iterator<Map.Entry<Path, Instant>> it = publishedFiles.entrySet().iterator(); it.hasNext();) {
Map.Entry<Path, Instant> pair = it.next();
if (isCachedPublishedFileOutdated(now, pair.getValue())) {
it.remove();
}
}
}
public synchronized int size() {
return publishedFiles.size();
}
private static boolean isCachedPublishedFileOutdated(Instant now, Instant then) {
final int timeToKeepInfoInSeconds = 60 * 60 * 24;
return now.getEpochSecond() - then.getEpochSecond() > timeToKeepInfoInSeconds;
}
}
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