| /* |
| * 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 org.apache.jackrabbit.oak.commons.jmx.ManagementOperation.Status.failed; |
| import static org.apache.jackrabbit.oak.commons.jmx.ManagementOperation.Status.initiated; |
| import static org.apache.jackrabbit.oak.commons.jmx.ManagementOperation.done; |
| import static org.apache.jackrabbit.oak.commons.jmx.ManagementOperation.newManagementOperation; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.Executor; |
| |
| import javax.management.openmbean.CompositeData; |
| |
| import com.google.common.base.Supplier; |
| import com.google.common.base.Suppliers; |
| import org.apache.jackrabbit.oak.commons.jmx.ManagementOperation; |
| import org.jetbrains.annotations.NotNull; |
| 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"; |
| |
| @NotNull |
| private ManagementOperation<Void> gcOp = done(OP_NAME, null); |
| |
| @NotNull |
| private final Runnable runGC; |
| |
| @NotNull |
| private final Runnable cancelGC; |
| |
| @NotNull |
| private final Supplier<String> statusMessage; |
| |
| @NotNull |
| private final Executor executor; |
| |
| /** |
| * @param runGC Revision garbage collector |
| * @param cancelGC Executor for cancelling the garbage collection task |
| * @param statusMessage an informal status message describing the status of the background |
| * operation at the time of invocation. |
| * @param executor Executor for initiating the garbage collection task |
| */ |
| public RevisionGC( |
| @NotNull Runnable runGC, |
| @NotNull Runnable cancelGC, |
| @NotNull Supplier<String> statusMessage, |
| @NotNull Executor executor) { |
| this.runGC = checkNotNull(runGC); |
| this.cancelGC = checkNotNull(cancelGC); |
| this.statusMessage = checkNotNull(statusMessage); |
| this.executor = checkNotNull(executor); |
| } |
| |
| /** |
| * @param runGC Revision garbage collector |
| * @param cancelGC Executor for cancelling the garbage collection task |
| * @param executor Executor for initiating the garbage collection task |
| */ |
| public RevisionGC( |
| @NotNull Runnable runGC, |
| @NotNull Runnable cancelGC, |
| @NotNull Executor executor) { |
| this(runGC, cancelGC, Suppliers.ofInstance(""), executor); |
| } |
| |
| @NotNull |
| @Override |
| public CompositeData startRevisionGC() { |
| if (gcOp.isDone()) { |
| gcOp = newManagementOperation(OP_NAME, statusMessage, new Callable<Void>() { |
| @Override |
| public Void call() throws Exception { |
| runGC.run(); |
| return null; |
| } |
| }); |
| executor.execute(gcOp); |
| return initiated(gcOp, OP_NAME + " started").toCompositeData(); |
| } else { |
| return failed(OP_NAME + " already running").toCompositeData(); |
| } |
| } |
| |
| @NotNull |
| @Override |
| public CompositeData cancelRevisionGC() { |
| if (!gcOp.isDone()) { |
| executor.execute(newManagementOperation(OP_NAME, new Callable<Void>() { |
| @Override |
| public Void call() throws Exception { |
| gcOp.cancel(false); |
| cancelGC.run(); |
| return null; |
| } |
| })); |
| return initiated(gcOp, "Revision garbage collection cancelled").toCompositeData(); |
| } else { |
| return failed(OP_NAME + " not running").toCompositeData(); |
| } |
| } |
| |
| @NotNull |
| @Override |
| public CompositeData getRevisionGCStatus() { |
| return gcOp.getStatus().toCompositeData(); |
| } |
| } |