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/**
* ============LICENSE_START=======================================================
* org.onap.aaf
* ================================================================================
* Copyright © 2018 European Software Marketing Ltd.
* ================================================================================
* 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.aaf.cadi.sidecar.fproxy.cache;
import java.lang.ref.SoftReference;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;
import org.onap.aaf.cadi.sidecar.fproxy.data.CredentialCacheData;
public class InMemoryCredentialCache implements CredentialCache {
private final ConcurrentHashMap<String, SoftReference<CredentialCacheData>> cache = new ConcurrentHashMap<>();
private final DelayQueue<DelayedCacheObject> cleaningUpQueue = new DelayQueue<>();
public InMemoryCredentialCache() {
Thread cleanerThread = new Thread(() -> {
while (!Thread.currentThread().isInterrupted()) {
try {
DelayedCacheObject delayedCacheObject = cleaningUpQueue.take();
cache.remove(delayedCacheObject.getKey(), delayedCacheObject.getReference());
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
});
cleanerThread.setDaemon(true);
cleanerThread.start();
}
@Override
public void add(String key, CredentialCacheData value, long periodInMillis) {
if (key == null) {
return;
}
if (value == null) {
cache.remove(key);
} else {
long expiryTime = System.currentTimeMillis() + periodInMillis;
SoftReference<CredentialCacheData> reference = new SoftReference<>(value);
cache.put(key, reference);
cleaningUpQueue.put(new DelayedCacheObject(key, reference, expiryTime));
}
}
@Override
public void remove(String key) {
cache.remove(key);
}
@Override
public CredentialCacheData get(String key) {
return Optional.ofNullable(cache.get(key)).map(SoftReference::get).orElse(null);
}
@Override
public void clear() {
cache.clear();
}
@Override
public long size() {
return cache.size();
}
private static class DelayedCacheObject implements Delayed {
private final String key;
private final SoftReference<CredentialCacheData> reference;
private final long expiryTime;
public DelayedCacheObject(String key, SoftReference<CredentialCacheData> reference, long expiryTime) {
super();
this.key = key;
this.reference = reference;
this.expiryTime = expiryTime;
}
@Override
public long getDelay(TimeUnit unit) {
return unit.convert(expiryTime - System.currentTimeMillis(), TimeUnit.MILLISECONDS);
}
@Override
public int compareTo(Delayed o) {
return Long.compare(expiryTime, ((DelayedCacheObject) o).expiryTime);
}
public String getKey() {
return key;
}
public SoftReference<CredentialCacheData> getReference() {
return reference;
}
}
}
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