src/java.base/share/classes/java/net/CacheRequest.java

/*
 * Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.net;

import java.io.OutputStream;
import java.io.IOException;

/**
 * Represents channels for storing resources in the
 * ResponseCache. Instances of such a class provide an
 * OutputStream object which is called by protocol handlers to
 * store the resource data into the cache, and also an abort() method
 * which allows a cache store operation to be interrupted and
 * abandoned. If an IOException is encountered while reading the
 * response or writing to the cache, the current cache store operation
 * will be aborted.
 *
 * @author Yingxian Wang
 * @since 1.5
 */
public abstract class CacheRequest {

    /**
     * Constructor for subclasses to call.
     */
    public CacheRequest() {}

    /**
     * Returns an OutputStream to which the response body can be
     * written.
     *
     * @return an OutputStream to which the response body can
     *         be written
     * @throws IOException if an I/O error occurs while
     *         writing the response body
     */
    public abstract OutputStream getBody() throws IOException;

    /**
     * Aborts the attempt to cache the response. If an IOException is
     * encountered while reading the response or writing to the cache,
     * the current cache store operation will be abandoned.
     */
    public abstract void abort();
}