/*
* Copyright 2005 Joe Walker
*
* Licensed 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.directwebremoting.io;
import java.io.IOException;
import java.io.OutputStream;
/**
* This class gives some lifecycle to an OutputStream.
* There may be times (particularly with downloading files to browsers) when it
* is not clear if the data will ever be read.
* A call to {@link #load(OutputStream)} is a signal that we really to want data
* <strong>now</strong> and that if any processing is needed, if should be done.
* A call to {@link #close()} is a signal that whether or not getInputStream was
* called, the data is no longer required.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public interface OutputStreamLoader
{
/**
* Write all the data to the given output stream.
*/
public void load(OutputStream out) throws IOException;
/**
* This method indicates that whether or not this resource has been read,
* it is not longer required.
* Must be called by whatever calls {@link #load(OutputStream)} when it has
* finished reading from the stream, or when it has decided that it never
* will call {@link #load(OutputStream)}.
*/
public void close() throws IOException;
}