/*
 * Copyright (C) 2015, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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 */

package org.eclipse.jgit.transport;

import java.io.OutputStream;

import org.eclipse.jgit.internal.storage.pack.PackWriter;
import org.eclipse.jgit.lib.ProgressMonitor;

/**
 * A callback to tell caller the count of objects ASAP.
 *
 * @since 4.1
 */
public interface ObjectCountCallback {
	/**
	 * Invoked when the {@link PackWriter} has counted the objects to be
	 * written to pack.
	 * <p>
	 * An {@code ObjectCountCallback} can use this information to decide
	 * whether the
	 * {@link PackWriter#writePack(ProgressMonitor, ProgressMonitor, OutputStream)}
	 * operation should be aborted.
	 * <p>
	 * This callback will be called exactly once.
	 *
	 * @param objectCount
	 *            the count of the objects.
	 * @throws WriteAbortedException
	 *             to indicate that the write operation should be aborted.
	 */
	void setObjectCount(long objectCount) throws WriteAbortedException;
}