/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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.
 *
 * Original Work: MIT License, Copyright (c) [2015-2018] all contributors
 * https://github.com/marianobarrios/tls-channel
 */

package com.mongodb.internal.connection.tlschannel;

import org.bson.ByteBuf;

import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.LongAccumulator;
import java.util.concurrent.atomic.LongAdder;
import java.util.function.LongBinaryOperator;

A decorating BufferAllocator that keeps statistics.
/** * A decorating {@link BufferAllocator} that keeps statistics. */
public class TrackingAllocator implements BufferAllocator { private BufferAllocator impl; private LongAdder bytesAllocatedAdder = new LongAdder(); private LongAdder bytesDeallocatedAdder = new LongAdder(); private AtomicLong currentAllocationSize = new AtomicLong(); private LongAccumulator maxAllocationSizeAcc = new LongAccumulator(new LongBinaryOperator() { @Override public long applyAsLong(final long a, final long b) { return Math.max(a, b); } }, 0); private LongAdder buffersAllocatedAdder = new LongAdder(); private LongAdder buffersDeallocatedAdder = new LongAdder(); public TrackingAllocator(final BufferAllocator impl) { this.impl = impl; } public ByteBuf allocate(final int size) { bytesAllocatedAdder.add(size); currentAllocationSize.addAndGet(size); buffersAllocatedAdder.increment(); return impl.allocate(size); } public void free(final ByteBuf buffer) { int size = buffer.capacity(); bytesDeallocatedAdder.add(size); maxAllocationSizeAcc.accumulate(currentAllocationSize.longValue()); currentAllocationSize.addAndGet(-size); buffersDeallocatedAdder.increment(); impl.free(buffer); } public long bytesAllocated() { return bytesAllocatedAdder.longValue(); } public long bytesDeallocated() { return bytesDeallocatedAdder.longValue(); } public long currentAllocation() { return currentAllocationSize.longValue(); } public long maxAllocation() { return maxAllocationSizeAcc.longValue(); } public long buffersAllocated() { return buffersAllocatedAdder.longValue(); } public long buffersDeallocated() { return buffersDeallocatedAdder.longValue(); } }