org.directwebremoting.io.InputStreamFactory Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dwr Show documentation

DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

The newest version!

/*
 * 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.InputStream;

import org.directwebremoting.extend.SimpleInputStreamFactory;

/**
 * This class gives some lifecycle to an InputStream.
 * 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 #getInputStream()} is a signal that we really to want data
 * now 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.
 * {@link SimpleInputStreamFactory}.
 * @see SimpleInputStreamFactory
 * @author Lance Semmens [uklance at gmail dot com]
 */
public interface InputStreamFactory
{
    /**
     * Gets an input stream. This function should be called only once.
     */
    public InputStream getInputStream() throws IOException;

    /**
     * Whether or not this resource has been read from, this should be called
     * to indicate that the resources are no longer required.
     */
    public void close() throws IOException;
}