001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.quotas.policies;
019
020import java.util.concurrent.atomic.AtomicBoolean;
021import org.apache.hadoop.hbase.quotas.SpaceViolationPolicy;
022import org.apache.hadoop.hbase.quotas.SpaceViolationPolicyEnforcement;
023import org.apache.yetus.audience.InterfaceAudience;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 * A {@link SpaceViolationPolicyEnforcement} implementation which disables all updates and
029 * compactions. The enforcement counterpart to {@link SpaceViolationPolicy#NO_WRITES_COMPACTIONS}.
030 */
031@InterfaceAudience.Private
032public class NoWritesCompactionsViolationPolicyEnforcement
033  extends NoWritesViolationPolicyEnforcement {
034  private static final Logger LOG =
035    LoggerFactory.getLogger(NoWritesCompactionsViolationPolicyEnforcement.class);
036
037  private AtomicBoolean disableCompactions = new AtomicBoolean(false);
038
039  @Override
040  public synchronized void enable() {
041    boolean ret = disableCompactions.compareAndSet(false, true);
042    if (!ret && LOG.isTraceEnabled()) {
043      LOG.trace("Compactions were already disabled upon enabling the policy");
044    }
045  }
046
047  @Override
048  public synchronized void disable() {
049    boolean ret = disableCompactions.compareAndSet(true, false);
050    if (!ret && LOG.isTraceEnabled()) {
051      LOG.trace("Compactions were already enabled upon disabling the policy");
052    }
053  }
054
055  @Override
056  public String getPolicyName() {
057    return SpaceViolationPolicy.NO_WRITES_COMPACTIONS.name();
058  }
059
060  @Override
061  public boolean areCompactionsDisabled() {
062    return disableCompactions.get();
063  }
064}