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RestrictedByteBufferCacheServletResponse.java
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RestrictedByteBufferCacheServletResponse.java
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/**
* Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.portal.kernel.servlet;
import com.liferay.portal.kernel.io.RestrictedByteArrayCacheOutputStream;
import com.liferay.portal.kernel.io.RestrictedByteArrayCacheOutputStream.FlushPreAction;
import com.liferay.portal.kernel.util.UnsyncPrintWriterPool;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.ByteBuffer;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
/**
* @author Shuyang Zhou
*/
public class RestrictedByteBufferCacheServletResponse
extends MetaInfoCacheServletResponse {
public RestrictedByteBufferCacheServletResponse(
HttpServletResponse response, int cacheCapacity) {
super(response);
_cacheCapacity = cacheCapacity;
}
public void flushCache() throws IOException {
if (_restrictedByteArrayCacheOutputStream != null) {
_restrictedByteArrayCacheOutputStream.flush();
}
}
@Override
public int getBufferSize() {
if (_restrictedByteArrayCacheOutputStream == null) {
return _cacheCapacity;
}
if (_restrictedByteArrayCacheOutputStream.isOverflowed()) {
return 0;
}
return _restrictedByteArrayCacheOutputStream.getCacheCapacity();
}
public ByteBuffer getByteBuffer() {
if (_restrictedByteArrayCacheOutputStream == null) {
return _emptyByteBuffer;
}
return _restrictedByteArrayCacheOutputStream.unsafeGetByteBuffer();
}
@Override
public ServletOutputStream getOutputStream() throws IOException {
if (calledGetWriter) {
throw new IllegalStateException(
"Unable to obtain OutputStream because Writer is already in " +
"use");
}
if (_servletOutputStream != null) {
return _servletOutputStream;
}
_restrictedByteArrayCacheOutputStream =
new RestrictedByteArrayCacheOutputStream(
super.getOutputStream(), _cacheCapacity,
new FinishResponseFlushPreAction());
_servletOutputStream = new ServletOutputStreamAdapter(
_restrictedByteArrayCacheOutputStream);
calledGetOutputStream = true;
return _servletOutputStream;
}
@Override
public PrintWriter getWriter() throws IOException {
if (calledGetOutputStream) {
throw new IllegalStateException(
"Unable to obtain Writer because OutputStream is already in " +
"use");
}
if (_printWriter != null) {
return _printWriter;
}
ServletResponse servletResponse = getResponse();
_restrictedByteArrayCacheOutputStream =
new RestrictedByteArrayCacheOutputStream(
servletResponse.getOutputStream(), _cacheCapacity,
new FinishResponseFlushPreAction());
_printWriter = UnsyncPrintWriterPool.borrow(
_restrictedByteArrayCacheOutputStream, getCharacterEncoding());
calledGetWriter = true;
return _printWriter;
}
public boolean isOverflowed() {
if (_restrictedByteArrayCacheOutputStream == null) {
return false;
}
return _restrictedByteArrayCacheOutputStream.isOverflowed();
}
@Override
public void setBufferSize(int bufferSize) {
if (isCommitted()) {
throw new IllegalStateException("Set buffer size after commit");
}
// Restricted byte buffer cache response cannot accept buffer size
// because it has an fixed size internal buffer.
}
@Override
protected void resetBuffer(boolean nullOutReferences) {
if (nullOutReferences) {
calledGetOutputStream = false;
calledGetWriter = false;
_printWriter = null;
_servletOutputStream = null;
_restrictedByteArrayCacheOutputStream = null;
}
else if (_restrictedByteArrayCacheOutputStream != null) {
_restrictedByteArrayCacheOutputStream.reset();
}
}
private static ByteBuffer _emptyByteBuffer = ByteBuffer.allocate(0);
private int _cacheCapacity;
private PrintWriter _printWriter;
private RestrictedByteArrayCacheOutputStream
_restrictedByteArrayCacheOutputStream;
private ServletOutputStream _servletOutputStream;
private class FinishResponseFlushPreAction implements FlushPreAction {
@Override
public void beforeFlush() throws IOException {
finishResponse(false);
}
}
}