/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.jackrabbit.oak.spi.state;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.lang.System.nanoTime;
import static org.apache.jackrabbit.oak.management.ManagementOperation.done;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import javax.annotation.Nonnull;
import javax.management.openmbean.CompositeData;
import org.apache.jackrabbit.oak.management.ManagementOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Default implementation of {@link RevisionGCMBean} based on a {@code Runnable}.
*/
public class RevisionGC implements RevisionGCMBean {
private static final Logger log = LoggerFactory.getLogger(RevisionGC.class);
public static final String OP_NAME = "Revision garbage collection";
private final Runnable gc;
private final Executor executor;
private ManagementOperation gcOp = done(OP_NAME, 0);
/**
* @param gc Revision garbage collector
* @param executor executor for running the garbage collection task
*/
public RevisionGC(
@Nonnull Runnable gc,
@Nonnull Executor executor) {
this.gc = checkNotNull(gc);
this.executor = checkNotNull(executor);
}
@Nonnull
@Override
public CompositeData startRevisionGC() {
if (gcOp.isDone()) {
gcOp = new ManagementOperation(OP_NAME, new Callable<Long>() {
@Override
public Long call() throws Exception {
long t0 = nanoTime();
gc.run();
return nanoTime() - t0;
}
});
executor.execute(gcOp);
}
return getRevisionGCStatus();
}
@Nonnull
@Override
public CompositeData getRevisionGCStatus() {
return gcOp.getStatus().toCompositeData();
}
}