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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
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
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();
}