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/*
 * ====================================================================
 * 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
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 * .
 *
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package org.apache.http.io;

import java.io.IOException;

import org.apache.http.util.CharArrayBuffer;

/**
 * Session output buffer for blocking connections. This interface is similar to
 * OutputStream class, but it also provides methods for writing lines of text.
 * 

* Implementing classes are also expected to manage intermediate data buffering * for optimal output performance. * * @since 4.0 */ public interface SessionOutputBuffer { /** * Writes {@code len} bytes from the specified byte array * starting at offset {@code off} to this session buffer. *

* If {@code off} is negative, or {@code len} is negative, or * {@code off+len} is greater than the length of the array * {@code b}, then an {@code IndexOutOfBoundsException} is thrown. * * @param b the data. * @param off the start offset in the data. * @param len the number of bytes to write. * @throws IOException if an I/O error occurs. */ void write(byte[] b, int off, int len) throws IOException; /** * Writes {@code b.length} bytes from the specified byte array * to this session buffer. * * @param b the data. * @throws IOException if an I/O error occurs. */ void write(byte[] b) throws IOException; /** * Writes the specified byte to this session buffer. * * @param b the {@code byte}. * @throws IOException if an I/O error occurs. */ void write(int b) throws IOException; /** * Writes characters from the specified string followed by a line delimiter * to this session buffer. *

* The choice of a char encoding and line delimiter sequence is up to the * specific implementations of this interface. * * @param s the line. * @throws IOException if an I/O error occurs. */ void writeLine(String s) throws IOException; /** * Writes characters from the specified char array followed by a line * delimiter to this session buffer. *

* The choice of a char encoding and line delimiter sequence is up to the * specific implementations of this interface. * * @param buffer the buffer containing chars of the line. * @throws IOException if an I/O error occurs. */ void writeLine(CharArrayBuffer buffer) throws IOException; /** * Flushes this session buffer and forces any buffered output bytes * to be written out. The general contract of {@code flush} is * that calling it is an indication that, if any bytes previously * written have been buffered by the implementation of the output * stream, such bytes should immediately be written to their * intended destination. * * @throws IOException if an I/O error occurs. */ void flush() throws IOException; /** * Returns {@link HttpTransportMetrics} for this session buffer. * * @return transport metrics. */ HttpTransportMetrics getMetrics(); }





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