/*
* ModeShape (http://www.modeshape.org)
*
* 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.
*/
package org.modeshape.jcr.spi.index.provider;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import javax.jcr.query.qom.Constraint;
import org.modeshape.common.annotation.Immutable;
import org.modeshape.jcr.api.index.IndexManager;
import org.modeshape.jcr.spi.index.IndexConstraints;
/**
* A {@link ManagedIndex} implementation which wraps an index instance created by a particular provider, offering
* a default implementation for some index-related operations.
*
* @author Horia Chiorean (hchiorea@redhat.com)
* @since 4.5
*/
@Immutable
public final class DefaultManagedIndex implements ManagedIndex {
private final ProvidedIndex<?> index;
private final IndexChangeAdapter adapter;
private final AtomicBoolean enabled = new AtomicBoolean(true);
private final AtomicReference<IndexManager.IndexStatus> status = new AtomicReference<>(IndexManager.IndexStatus.ENABLED);
/**
* Creates a new managed index instance which wraps an provider-specific instance and a change adapter.
*
* @param index a {@link ProvidedIndex} instance, may not be null.
* @param adapter a {@link IndexChangeAdapter} instance, may not be null.
*/
public DefaultManagedIndex( ProvidedIndex<?> index, IndexChangeAdapter adapter ) {
assert index != null;
assert adapter != null;
this.index = index;
this.adapter = adapter;
}
@Override
public long estimateTotalCount() {
return index.estimateTotalCount();
}
@Override
public long estimateCardinality( List<Constraint> andedConstraints,
Map<String, Object> variables ) {
return index.estimateCardinality(andedConstraints, variables);
}
@Override
public Results filter(IndexConstraints constraints, long cardinalityEstimate) {
return index.filter(constraints, cardinalityEstimate);
}
@Override
public IndexChangeAdapter getIndexChangeAdapter() {
return adapter;
}
@Override
public void enable( boolean enable ) {
this.enabled.set(enable);
if (enable) {
updateStatus(IndexManager.IndexStatus.DISABLED, IndexManager.IndexStatus.ENABLED);
} else {
updateStatus(IndexManager.IndexStatus.ENABLED, IndexManager.IndexStatus.DISABLED);
}
}
@Override
public boolean isEnabled() {
return this.enabled.get();
}
@Override
public void shutdown( boolean destroyed ) {
try {
index.shutdown(destroyed);
} finally {
enable(false);
}
}
@Override
public void clearAllData() {
index.clearAllData();
}
@Override
public IndexManager.IndexStatus getStatus() {
return status.get();
}
@Override
public void updateStatus(IndexManager.IndexStatus currentStatus, IndexManager.IndexStatus newStatus) {
this.status.compareAndSet(currentStatus, newStatus);
}
@Override
public boolean requiresReindexing() {
return index.requiresReindexing();
}
}