/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/EofSensorWatcher.java $
* $Revision: 552264 $
* $Date: 2007-07-01 02:37:47 -0700 (Sun, 01 Jul 2007) $
*
* ====================================================================
*
* 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
* <http://www.apache.org/>.
*
*/
package org.apache.http.conn;
import java.io.InputStream;
import java.io.IOException;
/**
* A watcher for {@link EofSensorInputStream EofSensorInputStream}.
* Each stream will notify it's watcher at most once.
*
* @author <a href="mailto:rolandw at apache.org">Roland Weber</a>
*
*
* <!-- empty lines to avoid svn diff problems -->
* @version $Revision: 552264 $
*
* @since 4.0
*/
public interface EofSensorWatcher {
/**
* Indicates that EOF is detected.
*
* @param wrapped the underlying stream which has reached EOF
*
* @return <code>true</code> if <code>wrapped</code> should be closed,
* <code>false</code> if it should be left alone
*
* @throws IOException
* in case of an IO problem, for example if the watcher itself
* closes the underlying stream. The caller will leave the
* wrapped stream alone, as if <code>false</code> was returned.
*/
boolean eofDetected(InputStream wrapped)
throws IOException
;
/**
* Indicates that the {@link EofSensorInputStream stream} is closed.
* This method will be called only if EOF was <i>not</i> detected
* before closing. Otherwise, {@link #eofDetected eofDetected} is called.
*
* @param wrapped the underlying stream which has not reached EOF
*
* @return <code>true</code> if <code>wrapped</code> should be closed,
* <code>false</code> if it should be left alone
*
* @throws IOException
* in case of an IO problem, for example if the watcher itself
* closes the underlying stream. The caller will leave the
* wrapped stream alone, as if <code>false</code> was returned.
*/
boolean streamClosed(InputStream wrapped)
throws IOException
;
/**
* Indicates that the {@link EofSensorInputStream stream} is aborted.
* This method will be called only if EOF was <i>not</i> detected
* before aborting. Otherwise, {@link #eofDetected eofDetected} is called.
* <p/>
* This method will also be invoked when an input operation causes an
* IOException to be thrown to make sure the input stream gets shut down.
*
* @param wrapped the underlying stream which has not reached EOF
*
* @return <code>true</code> if <code>wrapped</code> should be closed,
* <code>false</code> if it should be left alone
*
* @throws IOException
* in case of an IO problem, for example if the watcher itself
* closes the underlying stream. The caller will leave the
* wrapped stream alone, as if <code>false</code> was returned.
*/
boolean streamAbort(InputStream wrapped)
throws IOException
;
} // interface EofSensorWatcher