Java tutorial
/* * Copyright 2017 The Netty Project * * The Netty Project 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 io.netty.buffer; import io.netty.util.internal.StringUtil; import java.util.List; /** * Exposed metric for {@link PooledByteBufAllocator}. */ @SuppressWarnings("deprecation") public final class PooledByteBufAllocatorMetric implements ByteBufAllocatorMetric { private final PooledByteBufAllocator allocator; PooledByteBufAllocatorMetric(PooledByteBufAllocator allocator) { this.allocator = allocator; } /** * Return the number of heap arenas. */ public int numHeapArenas() { return allocator.numHeapArenas(); } /** * Return the number of direct arenas. */ public int numDirectArenas() { return allocator.numDirectArenas(); } /** * Return a {@link List} of all heap {@link PoolArenaMetric}s that are provided by this pool. */ public List<PoolArenaMetric> heapArenas() { return allocator.heapArenas(); } /** * Return a {@link List} of all direct {@link PoolArenaMetric}s that are provided by this pool. */ public List<PoolArenaMetric> directArenas() { return allocator.directArenas(); } /** * Return the number of thread local caches used by this {@link PooledByteBufAllocator}. */ public int numThreadLocalCaches() { return allocator.numThreadLocalCaches(); } /** * Return the size of the tiny cache. */ public int tinyCacheSize() { return allocator.tinyCacheSize(); } /** * Return the size of the small cache. */ public int smallCacheSize() { return allocator.smallCacheSize(); } /** * Return the size of the normal cache. */ public int normalCacheSize() { return allocator.normalCacheSize(); } /** * Return the chunk size for an arena. */ public int chunkSize() { return allocator.chunkSize(); } @Override public long usedHeapMemory() { return allocator.usedHeapMemory(); } @Override public long usedDirectMemory() { return allocator.usedDirectMemory(); } @Override public String toString() { StringBuilder sb = new StringBuilder(256); sb.append(StringUtil.simpleClassName(this)).append("(usedHeapMemory: ").append(usedHeapMemory()) .append("; usedDirectMemory: ").append(usedDirectMemory()).append("; numHeapArenas: ") .append(numHeapArenas()).append("; numDirectArenas: ").append(numDirectArenas()) .append("; tinyCacheSize: ").append(tinyCacheSize()).append("; smallCacheSize: ") .append(smallCacheSize()).append("; normalCacheSize: ").append(normalCacheSize()) .append("; numThreadLocalCaches: ").append(numThreadLocalCaches()).append("; chunkSize: ") .append(chunkSize()).append(')'); return sb.toString(); } }