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/*
 * Copyright 2016 The gRPC Authors
 *
 * 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 io.grpc.internal;

import java.util.HashSet;
import javax.annotation.concurrent.NotThreadSafe;

/**
 * Aggregates the in-use state of a set of objects.
 */
@NotThreadSafe
public abstract class InUseStateAggregator {

  private final HashSet inUseObjects = new HashSet<>();

  /**
   * Update the in-use state of an object. Initially no object is in use.
   *
   * 

This may call into {@link #handleInUse} or {@link #handleNotInUse} when appropriate. */ public final void updateObjectInUse(T object, boolean inUse) { int origSize = inUseObjects.size(); if (inUse) { inUseObjects.add(object); if (origSize == 0) { handleInUse(); } } else { boolean removed = inUseObjects.remove(object); if (removed && origSize == 1) { handleNotInUse(); } } } public final boolean isInUse() { return !inUseObjects.isEmpty(); } /** * Called when the aggregated in-use state has changed to true, which means at least one object is * in use. */ protected abstract void handleInUse(); /** * Called when the aggregated in-use state has changed to false, which means no object is in use. */ protected abstract void handleNotInUse(); }





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