001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to you under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.hadoop.hbase.quotas.policies;
018
019import java.util.concurrent.atomic.AtomicBoolean;
020
021import org.apache.yetus.audience.InterfaceAudience;
022import org.slf4j.Logger;
023import org.slf4j.LoggerFactory;
024import org.apache.hadoop.hbase.quotas.SpaceViolationPolicy;
025import org.apache.hadoop.hbase.quotas.SpaceViolationPolicyEnforcement;
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 = LoggerFactory.getLogger(
035      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}