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/*
 * 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 com.hazelcast.shaded.org.apache.calcite.util;

import com.hazelcast.shaded.org.apache.calcite.plan.Context;
import com.hazelcast.shaded.org.apache.calcite.plan.RelOptPlanner;

import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;

/**
 * CancelFlag is used to post and check cancellation requests.
 *
 * 

Pass it to {@link RelOptPlanner} by putting it into a {@link Context}. */ public class CancelFlag { //~ Instance fields -------------------------------------------------------- /** The flag that holds the cancel state. * Feel free to use the flag directly. */ public final AtomicBoolean atomicBoolean; public CancelFlag(AtomicBoolean atomicBoolean) { this.atomicBoolean = Objects.requireNonNull(atomicBoolean, "atomicBoolean"); } //~ Methods ---------------------------------------------------------------- /** Returns whether a cancellation has been requested. */ public boolean isCancelRequested() { return atomicBoolean.get(); } /** * Requests a cancellation. */ public void requestCancel() { atomicBoolean.compareAndSet(false, true); } /** * Clears any pending cancellation request. */ public void clearCancel() { atomicBoolean.compareAndSet(true, false); } }





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