| /** |
| * 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. |
| */ |
| |
| package org.apache.activemq.transport.tcp; |
| |
| import java.io.FilterOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * An optimized buffered outputstream for Tcp |
| * |
| * |
| */ |
| |
| public class TcpBufferedOutputStream extends FilterOutputStream implements TimeStampStream { |
| private static final int BUFFER_SIZE = 8192; |
| private byte[] buffer; |
| private int bufferlen; |
| private int count; |
| private volatile long writeTimestamp = -1;//concurrent reads of this value |
| |
| |
| /** |
| * Constructor |
| * |
| * @param out |
| */ |
| public TcpBufferedOutputStream(OutputStream out) { |
| this(out, BUFFER_SIZE); |
| } |
| |
| /** |
| * Creates a new buffered output stream to write data to the specified |
| * underlying output stream with the specified buffer size. |
| * |
| * @param out the underlying output stream. |
| * @param size the buffer size. |
| * @throws IllegalArgumentException if size <= 0. |
| */ |
| public TcpBufferedOutputStream(OutputStream out, int size) { |
| super(out); |
| if (size <= 0) { |
| throw new IllegalArgumentException("Buffer size <= 0"); |
| } |
| buffer = new byte[size]; |
| bufferlen = size; |
| } |
| |
| /** |
| * write a byte on to the stream |
| * |
| * @param b - byte to write |
| * @throws IOException |
| */ |
| public void write(int b) throws IOException { |
| if ((bufferlen - count) < 1) { |
| flush(); |
| } |
| buffer[count++] = (byte)b; |
| } |
| |
| /** |
| * write a byte array to the stream |
| * |
| * @param b the byte buffer |
| * @param off the offset into the buffer |
| * @param len the length of data to write |
| * @throws IOException |
| */ |
| public void write(byte b[], int off, int len) throws IOException { |
| if (b != null) { |
| if ((bufferlen - count) < len) { |
| flush(); |
| } |
| if (buffer.length >= len) { |
| System.arraycopy(b, off, buffer, count, len); |
| count += len; |
| } else { |
| try { |
| writeTimestamp = System.currentTimeMillis(); |
| out.write(b, off, len); |
| } finally { |
| writeTimestamp = -1; |
| } |
| } |
| } |
| } |
| |
| /** |
| * flush the data to the output stream This doesn't call flush on the |
| * underlying outputstream, because Tcp is particularly efficent at doing |
| * this itself .... |
| * |
| * @throws IOException |
| */ |
| public void flush() throws IOException { |
| if (count > 0 && out != null) { |
| try { |
| writeTimestamp = System.currentTimeMillis(); |
| out.write(buffer, 0, count); |
| } finally { |
| writeTimestamp = -1; |
| } |
| count = 0; |
| } |
| } |
| |
| /** |
| * close this stream |
| * |
| * @throws IOException |
| */ |
| public void close() throws IOException { |
| super.close(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.activemq.transport.tcp.TimeStampStream#isWriting() |
| */ |
| public boolean isWriting() { |
| return writeTimestamp > 0; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.activemq.transport.tcp.TimeStampStream#getWriteTimestamp() |
| */ |
| public long getWriteTimestamp() { |
| return writeTimestamp; |
| } |
| |
| } |