/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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.
 */

package io.undertow.conduits;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import org.xnio.IoUtils;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.AbstractStreamSinkConduit;
import org.xnio.conduits.ConduitWritableByteChannel;
import org.xnio.conduits.StreamSinkConduit;
import io.undertow.UndertowMessages;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.AttachmentKey;

Author:Stuart Douglas
/** * @author Stuart Douglas */
public final class StoredResponseStreamSinkConduit extends AbstractStreamSinkConduit<StreamSinkConduit> { public static final AttachmentKey<byte[]> RESPONSE = AttachmentKey.create(byte[].class); private ByteArrayOutputStream outputStream; private final HttpServerExchange exchange;
Construct a new instance.
Params:
  • next – the delegate conduit to set
  • exchange –
/** * Construct a new instance. * * @param next the delegate conduit to set * @param exchange */
public StoredResponseStreamSinkConduit(StreamSinkConduit next, HttpServerExchange exchange) { super(next); this.exchange = exchange; long length = exchange.getResponseContentLength(); if (length <= 0L) { outputStream = new ByteArrayOutputStream(); } else { if (length > Integer.MAX_VALUE) { throw UndertowMessages.MESSAGES.responseTooLargeToBuffer(length); } outputStream = new ByteArrayOutputStream((int) length); } } @Override public long transferFrom(StreamSourceChannel source, long count, ByteBuffer throughBuffer) throws IOException { return IoUtils.transfer(source, count, throughBuffer, new ConduitWritableByteChannel(this)); } @Override public long transferFrom(FileChannel src, long position, long count) throws IOException { return src.transferTo(position, count, new ConduitWritableByteChannel(this)); } @Override public int write(ByteBuffer src) throws IOException { int start = src.position(); int ret = super.write(src); for (int i = start; i < start + ret; ++i) { outputStream.write(src.get(i)); } return ret; } @Override public long write(ByteBuffer[] srcs, int offs, int len) throws IOException { int[] starts = new int[len]; for (int i = 0; i < len; ++i) { starts[i] = srcs[i + offs].position(); } long ret = super.write(srcs, offs, len); long rem = ret; for (int i = 0; i < len; ++i) { ByteBuffer buf = srcs[i + offs]; int pos = starts[i]; while (rem > 0 && pos <= buf.position()) { outputStream.write(buf.get(pos)); pos++; rem--; } } return ret; } @Override public int writeFinal(ByteBuffer src) throws IOException { int start = src.position(); int ret = super.writeFinal(src); for (int i = start; i < start + ret; ++i) { outputStream.write(src.get(i)); } if (!src.hasRemaining()) { exchange.putAttachment(RESPONSE, outputStream.toByteArray()); outputStream = null; } return ret; } @Override public long writeFinal(ByteBuffer[] srcs, int offs, int len) throws IOException { int[] starts = new int[len]; long toWrite = 0; for (int i = 0; i < len; ++i) { starts[i] = srcs[i + offs].position(); toWrite += srcs[i + offs].remaining(); } long ret = super.write(srcs, offs, len); long rem = ret; for (int i = 0; i < len; ++i) { ByteBuffer buf = srcs[i + offs]; int pos = starts[i]; while (rem > 0 && pos <= buf.position()) { outputStream.write(buf.get(pos)); pos++; rem--; } } if (toWrite == ret) { exchange.putAttachment(RESPONSE, outputStream.toByteArray()); outputStream = null; } return ret; } @Override public void terminateWrites() throws IOException { exchange.putAttachment(RESPONSE, outputStream.toByteArray()); outputStream = null; super.terminateWrites(); } }