Java tutorial
/** * Copyright 2010 - 2015 JetBrains s.r.o. * * 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 jetbrains.exodus.gc; import jetbrains.exodus.core.execution.LatchJob; import jetbrains.exodus.log.Log; import org.apache.commons.logging.LogFactory; import org.jetbrains.annotations.NotNull; final class CleanWholeLogJob extends LatchJob { private static final org.apache.commons.logging.Log logging = LogFactory.getLog(CleanWholeLogJob.class); @NotNull private final GarbageCollector gc; CleanWholeLogJob(@NotNull GarbageCollector gc) { this.gc = gc; } @Override protected void execute() throws Throwable { info("CleanWholeLogJob started"); try { final Log log = gc.getLog(); long lastNumberOfFiles = Long.MAX_VALUE; long numberOfFiles; // repeat cleaning until number of files stops decreasing while ((numberOfFiles = log.getNumberOfFiles()) != 1 && numberOfFiles < lastNumberOfFiles) { lastNumberOfFiles = numberOfFiles; final long highFileAddress = log.getHighFileAddress(); long fileAddress = log.getLowAddress(); while (fileAddress != highFileAddress) { gc.cleanFile(fileAddress); fileAddress = log.getNextFileAddress(fileAddress); } gc.testDeletePendingFiles(); } } finally { release(); info("CleanWholeLogJob finished"); } } private static void info(@NotNull final String message) { if (logging.isInfoEnabled()) { logging.info(message); } } }