/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
0
disables fragment buffering.
* @param charencoder charencoder to be used for encoding HTTP protocol elements.
* If null
simple type cast will be used for char to byte conversion.
*/
public SessionOutputBufferImpl(
final HttpTransportMetricsImpl metrics,
final int buffersize,
final int fragementSizeHint,
final CharsetEncoder charencoder) {
super();
Args.positive(buffersize, "Buffer size");
Args.notNull(metrics, "HTTP transport metrcis");
this.metrics = metrics;
this.buffer = new ByteArrayBuffer(buffersize);
this.fragementSizeHint = fragementSizeHint >= 0 ? fragementSizeHint : 0;
this.encoder = charencoder;
}
public SessionOutputBufferImpl(
final HttpTransportMetricsImpl metrics,
final int buffersize) {
this(metrics, buffersize, buffersize, null);
}
public void bind(final OutputStream outstream) {
this.outstream = outstream;
}
public boolean isBound() {
return this.outstream != null;
}
public int capacity() {
return this.buffer.capacity();
}
public int length() {
return this.buffer.length();
}
public int available() {
return capacity() - length();
}
private void streamWrite(final byte[] b, final int off, final int len) throws IOException {
Asserts.notNull(outstream, "Output stream");
this.outstream.write(b, off, len);
}
private void flushStream() throws IOException {
if (this.outstream != null) {
this.outstream.flush();
}
}
private void flushBuffer() throws IOException {
final int len = this.buffer.length();
if (len > 0) {
streamWrite(this.buffer.buffer(), 0, len);
this.buffer.clear();
this.metrics.incrementBytesTransferred(len);
}
}
public void flush() throws IOException {
flushBuffer();
flushStream();
}
public void write(final byte[] b, final int off, final int len) throws IOException {
if (b == null) {
return;
}
// Do not want to buffer large-ish chunks
// if the byte array is larger then MIN_CHUNK_LIMIT
// write it directly to the output stream
if (len > this.fragementSizeHint || len > this.buffer.capacity()) {
// flush the buffer
flushBuffer();
// write directly to the out stream
streamWrite(b, off, len);
this.metrics.incrementBytesTransferred(len);
} else {
// Do not let the buffer grow unnecessarily
final int freecapacity = this.buffer.capacity() - this.buffer.length();
if (len > freecapacity) {
// flush the buffer
flushBuffer();
}
// buffer
this.buffer.append(b, off, len);
}
}
public void write(final byte[] b) throws IOException {
if (b == null) {
return;
}
write(b, 0, b.length);
}
public void write(final int b) throws IOException {
if (this.fragementSizeHint > 0) {
if (this.buffer.isFull()) {
flushBuffer();
}
this.buffer.append(b);
} else {
flushBuffer();
this.outstream.write(b);
}
}
/**
* Writes characters from the specified string followed by a line delimiter
* to this session buffer.
* * This method uses CR-LF as a line delimiter. * * @param s the line. * @exception IOException if an I/O error occurs. */ public void writeLine(final String s) throws IOException { if (s == null) { return; } if (s.length() > 0) { if (this.encoder == null) { for (int i = 0; i < s.length(); i++) { write(s.charAt(i)); } } else { final CharBuffer cbuf = CharBuffer.wrap(s); writeEncoded(cbuf); } } write(CRLF); } /** * Writes characters from the specified char array followed by a line * delimiter to this session buffer. *
* This method uses CR-LF as a line delimiter. * * @param charbuffer the buffer containing chars of the line. * @exception IOException if an I/O error occurs. */ public void writeLine(final CharArrayBuffer charbuffer) throws IOException { if (charbuffer == null) { return; } if (this.encoder == null) { int off = 0; int remaining = charbuffer.length(); while (remaining > 0) { int chunk = this.buffer.capacity() - this.buffer.length(); chunk = Math.min(chunk, remaining); if (chunk > 0) { this.buffer.append(charbuffer, off, chunk); } if (this.buffer.isFull()) { flushBuffer(); } off += chunk; remaining -= chunk; } } else { final CharBuffer cbuf = CharBuffer.wrap(charbuffer.buffer(), 0, charbuffer.length()); writeEncoded(cbuf); } write(CRLF); } private void writeEncoded(final CharBuffer cbuf) throws IOException { if (!cbuf.hasRemaining()) { return; } if (this.bbuf == null) { this.bbuf = ByteBuffer.allocate(1024); } this.encoder.reset(); while (cbuf.hasRemaining()) { final CoderResult result = this.encoder.encode(cbuf, this.bbuf, true); handleEncodingResult(result); } final CoderResult result = this.encoder.flush(this.bbuf); handleEncodingResult(result); this.bbuf.clear(); } private void handleEncodingResult(final CoderResult result) throws IOException { if (result.isError()) { result.throwException(); } this.bbuf.flip(); while (this.bbuf.hasRemaining()) { write(this.bbuf.get()); } this.bbuf.compact(); } public HttpTransportMetrics getMetrics() { return this.metrics; } }