/*
* Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.yangtools.yang.model.repo.util;
import com.google.common.annotations.Beta;
import com.google.common.base.FinalizablePhantomReference;
import com.google.common.base.FinalizableReferenceQueue;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.Futures;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.opendaylight.yangtools.yang.model.repo.api.MissingSchemaSourceException;
import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceException;
import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceRepresentation;
import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
import org.opendaylight.yangtools.yang.model.repo.spi.PotentialSchemaSource.Costs;
import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceRegistration;
import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceRegistry;
@Beta
public class InMemorySchemaSourceCache<T extends SchemaSourceRepresentation> extends AbstractSchemaSourceCache<T> implements AutoCloseable {
private final List<FinalizablePhantomReference<T>> regs = Collections.synchronizedList(new ArrayList<>());
private final FinalizableReferenceQueue queue = new FinalizableReferenceQueue();
private final Cache<SourceIdentifier, T> cache;
protected InMemorySchemaSourceCache(final SchemaSourceRegistry consumer, final Class<T> representation, final CacheBuilder<Object, Object> builder) {
super(consumer, representation, Costs.IMMEDIATE);
cache = builder.build();
}
public static <R extends SchemaSourceRepresentation> InMemorySchemaSourceCache<R> createSoftCache(final SchemaSourceRegistry consumer, final Class<R> representation) {
return new InMemorySchemaSourceCache<>(consumer, representation, CacheBuilder.newBuilder().softValues());
}
public static <R extends SchemaSourceRepresentation> InMemorySchemaSourceCache<R> createSoftCache(
final SchemaSourceRegistry consumer, final Class<R> representation, final long lifetime, final TimeUnit units) {
return new InMemorySchemaSourceCache<>(consumer, representation, CacheBuilder.newBuilder().softValues()
.expireAfterAccess(lifetime, units));
}
@Override
public CheckedFuture<? extends T, SchemaSourceException> getSource(final SourceIdentifier sourceIdentifier) {
final T present = cache.getIfPresent(sourceIdentifier);
if (present != null) {
return Futures.immediateCheckedFuture(present);
}
return Futures.immediateFailedCheckedFuture(new MissingSchemaSourceException("Source not found", sourceIdentifier));
}
@Override
protected void offer(final T source) {
final T present = cache.getIfPresent(source.getIdentifier());
if (present == null) {
cache.put(source.getIdentifier(), source);
final SchemaSourceRegistration<T> reg = register(source.getIdentifier());
final FinalizablePhantomReference<T> ref = new FinalizablePhantomReference<T>(source, queue) {
@Override
public void finalizeReferent() {
reg.close();
regs.remove(this);
}
};
regs.add(ref);
}
}
@Override
public void close() {
while (!regs.isEmpty()) {
final FinalizablePhantomReference<?> ref = regs.get(0);
ref.finalizeReferent();
}
cache.invalidateAll();
queue.close();
}
}