2012-12-05 22:11:48 +01:00
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/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.buffer;
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2013-03-05 09:55:24 +01:00
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import io.netty.util.internal.PlatformDependent;
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2012-12-05 22:11:48 +01:00
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import io.netty.util.internal.StringUtil;
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2013-04-03 05:08:01 +02:00
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import io.netty.util.internal.SystemPropertyUtil;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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2012-12-05 22:11:48 +01:00
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import java.nio.ByteBuffer;
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import java.util.concurrent.atomic.AtomicInteger;
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public class PooledByteBufAllocator extends AbstractByteBufAllocator {
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2013-04-03 05:08:01 +02:00
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(PooledByteBufAllocator.class);
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private static final int DEFAULT_NUM_HEAP_ARENA = Math.max(1, SystemPropertyUtil.getInt(
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"io.netty.allocator.numHeapArenas", Runtime.getRuntime().availableProcessors()));
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private static final int DEFAULT_NUM_DIRECT_ARENA = Math.max(1, SystemPropertyUtil.getInt(
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"io.netty.allocator.numDirectArenas", Runtime.getRuntime().availableProcessors()));
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private static final int DEFAULT_PAGE_SIZE;
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private static final int DEFAULT_MAX_ORDER; // 8192 << 11 = 16 MiB per chunk
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2012-12-05 22:11:48 +01:00
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private static final int MIN_PAGE_SIZE = 4096;
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private static final int MAX_CHUNK_SIZE = (int) (((long) Integer.MAX_VALUE + 1) / 2);
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2013-04-03 05:08:01 +02:00
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static {
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int defaultPageSize = SystemPropertyUtil.getInt("io.netty.allocator.pageSize", 8192);
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Throwable pageSizeFallbackCause = null;
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try {
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validateAndCalculatePageShifts(defaultPageSize);
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} catch (Throwable t) {
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pageSizeFallbackCause = t;
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defaultPageSize = 8192;
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}
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DEFAULT_PAGE_SIZE = defaultPageSize;
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int defaultMaxOrder = SystemPropertyUtil.getInt("io.netty.allocator.maxOrder", 11);
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Throwable maxOrderFallbackCause = null;
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try {
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validateAndCalculateChunkSize(DEFAULT_PAGE_SIZE, defaultMaxOrder);
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} catch (Throwable t) {
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maxOrderFallbackCause = t;
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defaultMaxOrder = 11;
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}
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DEFAULT_MAX_ORDER = defaultMaxOrder;
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if (logger.isDebugEnabled()) {
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logger.debug("io.netty.allocator.numHeapArenas: {}", DEFAULT_NUM_HEAP_ARENA);
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logger.debug("io.netty.allocator.numDirectArenas: {}", DEFAULT_NUM_DIRECT_ARENA);
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if (pageSizeFallbackCause == null) {
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logger.debug("io.netty.allocator.pageSize: {}", DEFAULT_PAGE_SIZE);
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} else {
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logger.debug("io.netty.allocator.pageSize: {}", DEFAULT_PAGE_SIZE, pageSizeFallbackCause);
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}
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if (maxOrderFallbackCause == null) {
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logger.debug("io.netty.allocator.maxOrder: {}", DEFAULT_MAX_ORDER);
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} else {
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logger.debug("io.netty.allocator.maxOrder: {}", DEFAULT_MAX_ORDER, maxOrderFallbackCause);
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}
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logger.debug("io.netty.allocator.chunkSize: {}", DEFAULT_PAGE_SIZE << DEFAULT_MAX_ORDER);
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}
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}
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2013-03-05 09:55:24 +01:00
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public static final PooledByteBufAllocator DEFAULT =
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new PooledByteBufAllocator(PlatformDependent.directBufferPreferred());
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2012-12-05 22:11:48 +01:00
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private final PoolArena<byte[]>[] heapArenas;
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private final PoolArena<ByteBuffer>[] directArenas;
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final ThreadLocal<PoolThreadCache> threadCache = new ThreadLocal<PoolThreadCache>() {
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private final AtomicInteger index = new AtomicInteger();
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@Override
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protected PoolThreadCache initialValue() {
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int idx = Math.abs(index.getAndIncrement() % heapArenas.length);
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return new PoolThreadCache(heapArenas[idx], directArenas[idx]);
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}
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};
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public PooledByteBufAllocator() {
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this(false);
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}
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2013-03-05 09:55:24 +01:00
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public PooledByteBufAllocator(boolean preferDirect) {
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this(preferDirect, DEFAULT_NUM_HEAP_ARENA, DEFAULT_NUM_DIRECT_ARENA, DEFAULT_PAGE_SIZE, DEFAULT_MAX_ORDER);
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2012-12-05 22:11:48 +01:00
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}
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public PooledByteBufAllocator(int nHeapArena, int nDirectArena, int pageSize, int maxOrder) {
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this(false, nHeapArena, nDirectArena, pageSize, maxOrder);
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}
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public PooledByteBufAllocator(
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boolean directByDefault, int nHeapArena, int nDirectArena, int pageSize, int maxOrder) {
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2012-12-19 09:35:32 +01:00
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super(directByDefault);
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final int chunkSize = validateAndCalculateChunkSize(pageSize, maxOrder);
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2012-12-05 22:11:48 +01:00
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if (nHeapArena <= 0) {
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throw new IllegalArgumentException("nHeapArena: " + nHeapArena + " (expected: 1+)");
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}
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if (nDirectArena <= 0) {
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throw new IllegalArgumentException("nDirectArea: " + nDirectArena + " (expected: 1+)");
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}
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int pageShifts = validateAndCalculatePageShifts(pageSize);
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heapArenas = newArenaArray(nHeapArena);
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for (int i = 0; i < heapArenas.length; i ++) {
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heapArenas[i] = new PoolArena.HeapArena(this, pageSize, maxOrder, pageShifts, chunkSize);
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}
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directArenas = newArenaArray(nDirectArena);
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for (int i = 0; i < directArenas.length; i ++) {
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directArenas[i] = new PoolArena.DirectArena(this, pageSize, maxOrder, pageShifts, chunkSize);
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}
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}
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@SuppressWarnings("unchecked")
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private static <T> PoolArena<T>[] newArenaArray(int size) {
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return new PoolArena[size];
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}
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private static int validateAndCalculatePageShifts(int pageSize) {
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if (pageSize < MIN_PAGE_SIZE) {
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throw new IllegalArgumentException("pageSize: " + pageSize + " (expected: 4096+)");
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}
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// Ensure pageSize is power of 2.
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boolean found1 = false;
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int pageShifts = 0;
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for (int i = pageSize; i != 0 ; i >>= 1) {
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if ((i & 1) != 0) {
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if (!found1) {
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found1 = true;
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} else {
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throw new IllegalArgumentException("pageSize: " + pageSize + " (expected: power of 2");
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}
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} else {
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if (!found1) {
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pageShifts ++;
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}
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}
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}
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return pageShifts;
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}
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private static int validateAndCalculateChunkSize(int pageSize, int maxOrder) {
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if (maxOrder > 14) {
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throw new IllegalArgumentException("maxOrder: " + maxOrder + " (expected: 0-14)");
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}
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// Ensure the resulting chunkSize does not overflow.
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int chunkSize = pageSize;
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for (int i = maxOrder; i > 0; i --) {
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if (chunkSize > MAX_CHUNK_SIZE / 2) {
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throw new IllegalArgumentException(String.format(
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"pageSize (%d) << maxOrder (%d) must not exceed %d", pageSize, maxOrder, MAX_CHUNK_SIZE));
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}
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chunkSize <<= 1;
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}
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return chunkSize;
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}
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@Override
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protected ByteBuf newHeapBuffer(int initialCapacity, int maxCapacity) {
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PoolThreadCache cache = threadCache.get();
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return cache.heapArena.allocate(cache, initialCapacity, maxCapacity);
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}
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@Override
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protected ByteBuf newDirectBuffer(int initialCapacity, int maxCapacity) {
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PoolThreadCache cache = threadCache.get();
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return cache.directArena.allocate(cache, initialCapacity, maxCapacity);
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}
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public String toString() {
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StringBuilder buf = new StringBuilder();
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buf.append(heapArenas.length);
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2012-12-19 09:35:32 +01:00
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buf.append(" heap arena(s):");
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2012-12-05 22:11:48 +01:00
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buf.append(StringUtil.NEWLINE);
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for (PoolArena<byte[]> a: heapArenas) {
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buf.append(a);
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}
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2012-12-19 09:35:32 +01:00
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buf.append(directArenas.length);
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buf.append(" direct arena(s):");
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buf.append(StringUtil.NEWLINE);
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for (PoolArena<ByteBuffer> a: directArenas) {
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buf.append(a);
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}
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2012-12-05 22:11:48 +01:00
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return buf.toString();
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}
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}
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