145 lines
4.8 KiB
Java
145 lines
4.8 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.util.net;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.concurrent.LinkedBlockingDeque;
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import org.apache.tomcat.util.buf.ByteBufferHolder;
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/**
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* Provides an expandable set of buffers for writes. Non-blocking writes can be
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* of any size and may not be able to be written immediately or wholly contained
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* in the buffer used to perform the writes to the next layer. This class
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* provides a buffering capability to allow such writes to return immediately
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* and also allows for the user provided buffers to be re-used / recycled as
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* required.
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*/
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public class WriteBuffer {
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private final int bufferSize;
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private final LinkedBlockingDeque<ByteBufferHolder> buffers = new LinkedBlockingDeque<>();
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public WriteBuffer(int bufferSize) {
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this.bufferSize = bufferSize;
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}
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void add(byte[] buf, int offset, int length) {
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ByteBufferHolder holder = getByteBufferHolder(length);
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holder.getBuf().put(buf, offset, length);
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}
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public void add(ByteBuffer from) {
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ByteBufferHolder holder = getByteBufferHolder(from.remaining());
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holder.getBuf().put(from);
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}
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private ByteBufferHolder getByteBufferHolder(int capacity) {
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ByteBufferHolder holder = buffers.peekLast();
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if (holder == null || holder.isFlipped() || holder.getBuf().remaining() < capacity) {
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ByteBuffer buffer = ByteBuffer.allocate(Math.max(bufferSize, capacity));
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holder = new ByteBufferHolder(buffer, false);
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buffers.add(holder);
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}
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return holder;
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}
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public boolean isEmpty() {
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return buffers.isEmpty();
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}
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/**
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* Create an array of ByteBuffers from the current WriteBuffer, prefixing
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* that array with the provided ByteBuffers.
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*
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* @param prefixes The additional ByteBuffers to add to the start of the
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* array
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*
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* @return an array of ByteBuffers from the current WriteBuffer prefixed by
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* the provided ByteBuffers
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*/
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ByteBuffer[] toArray(ByteBuffer... prefixes) {
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List<ByteBuffer> result = new ArrayList<>();
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for (ByteBuffer prefix : prefixes) {
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if (prefix.hasRemaining()) {
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result.add(prefix);
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}
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}
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for (ByteBufferHolder buffer : buffers) {
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buffer.flip();
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result.add(buffer.getBuf());
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}
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buffers.clear();
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return result.toArray(new ByteBuffer[result.size()]);
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}
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boolean write(SocketWrapperBase<?> socketWrapper, boolean blocking) throws IOException {
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Iterator<ByteBufferHolder> bufIter = buffers.iterator();
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boolean dataLeft = false;
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while (!dataLeft && bufIter.hasNext()) {
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ByteBufferHolder buffer = bufIter.next();
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buffer.flip();
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if (blocking) {
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socketWrapper.writeBlocking(buffer.getBuf());
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} else {
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socketWrapper.writeNonBlockingInternal(buffer.getBuf());
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}
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if (buffer.getBuf().remaining() == 0) {
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bufIter.remove();
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} else {
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dataLeft = true;
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}
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}
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return dataLeft;
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}
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public boolean write(Sink sink, boolean blocking) throws IOException {
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Iterator<ByteBufferHolder> bufIter = buffers.iterator();
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boolean dataLeft = false;
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while (!dataLeft && bufIter.hasNext()) {
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ByteBufferHolder buffer = bufIter.next();
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buffer.flip();
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dataLeft = sink.writeFromBuffer(buffer.getBuf(), blocking);
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if (!dataLeft) {
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bufIter.remove();
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}
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}
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return dataLeft;
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}
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/**
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* Interface implemented by clients of the WriteBuffer to enable data to be
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* written back out from the buffer.
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*/
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public interface Sink {
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boolean writeFromBuffer(ByteBuffer buffer, boolean block) throws IOException;
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}
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}
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