42c65cca3a
- Move common methods from ByteBuf to Buf - Rename ensureWritableBytes() to ensureWritable() - Rename readable() to isReadable() - Rename writable() to isWritable() - Add isReadable(int) and isWritable(int) - Add AbstractMessageBuf - Rewrite DefaultMessageBuf and QueueBackedMessageBuf - based on Josh Bloch's public domain ArrayDeque impl
160 lines
3.7 KiB
Java
160 lines
3.7 KiB
Java
/*
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* Copyright 2013 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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import java.util.AbstractQueue;
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import java.util.Collection;
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public abstract class AbstractMessageBuf<T> extends AbstractQueue<T> implements MessageBuf<T> {
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private final int maxCapacity;
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private boolean freed;
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protected AbstractMessageBuf(int maxCapacity) {
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if (maxCapacity < 0) {
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throw new IllegalArgumentException("maxCapacity: " + maxCapacity + " (expected: >= 0)");
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}
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this.maxCapacity = maxCapacity;
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}
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@Override
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public final BufType type() {
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return BufType.MESSAGE;
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}
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@Override
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public final boolean isFreed() {
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return freed;
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}
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@Override
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public final void free() {
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if (freed) {
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return;
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}
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try {
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doFree();
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} finally {
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freed = true;
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}
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}
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protected abstract void doFree();
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@Override
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public final int maxCapacity() {
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return maxCapacity;
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}
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@Override
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public final boolean isReadable() {
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return !isEmpty();
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}
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@Override
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public final boolean isReadable(int size) {
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if (size < 0) {
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throw new IllegalArgumentException("size: " + size + " (expected: >= 0)");
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}
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return size() >= size;
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}
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@Override
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public final boolean isWritable() {
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return size() < maxCapacity;
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}
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@Override
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public final boolean isWritable(int size) {
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if (size < 0) {
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throw new IllegalArgumentException("size: " + size + " (expected: >= 0)");
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}
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return size() <= maxCapacity - size;
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}
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protected final void checkUnfreed() {
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if (isFreed()) {
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throw new IllegalBufferAccessException();
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}
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}
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@Override
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public final boolean add(T t) {
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return super.add(t);
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}
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@Override
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public final T remove() {
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return super.remove();
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}
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@Override
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public final T element() {
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return super.element();
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}
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@Override
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public int drainTo(Collection<? super T> c) {
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checkUnfreed();
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int cnt = 0;
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for (;;) {
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T o = poll();
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if (o == null) {
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break;
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}
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c.add(o);
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cnt ++;
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}
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return cnt;
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}
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@Override
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public int drainTo(Collection<? super T> c, int maxElements) {
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checkUnfreed();
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int cnt = 0;
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while (cnt < maxElements) {
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T o = poll();
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if (o == null) {
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break;
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}
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c.add(o);
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cnt ++;
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}
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return cnt;
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}
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@Override
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public String toString() {
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if (isFreed()) {
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return getClass().getSimpleName() + "(freed)";
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}
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StringBuilder buf = new StringBuilder();
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buf.append(getClass().getSimpleName());
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buf.append("(size: ");
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buf.append(size());
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if (maxCapacity != Integer.MAX_VALUE) {
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buf.append('/');
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buf.append(maxCapacity);
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}
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buf.append(')');
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return buf.toString();
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}
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}
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