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/*
* Copyright (C) 2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lib;
import java.io.IOException;
import org.eclipse.jgit.errors.MissingObjectException;
/**
* Queue to examine object sizes asynchronously.
*
* A queue may perform background lookup of object sizes and supply them
* (possibly out-of-order) to the application.
*
* @param <T>
* type of identifier supplied to the call that made the queue.
*/
public interface AsyncObjectSizeQueue<T extends ObjectId> extends
AsyncOperation {
/**
* Position this queue onto the next available result.
*
* @return true if there is a result available; false if the queue has
* finished its input iteration.
* @throws org.eclipse.jgit.errors.MissingObjectException
* the object does not exist. If the implementation is retaining
* the application's objects {@link #getCurrent()} will be the
* current object that is missing. There may be more results
* still available, so the caller should continue invoking next
* to examine another result.
* @throws java.io.IOException
* the object store cannot be accessed.
*/
boolean next() throws MissingObjectException, IOException;
/**
* <p>getCurrent.</p>
*
* @return the current object, null if the implementation lost track.
* Implementations may for performance reasons discard the caller's
* ObjectId and provider their own through {@link #getObjectId()}.
*/
T getCurrent();
/**
* Get the ObjectId of the current object. Never null.
*
* @return the ObjectId of the current object. Never null.
*/
ObjectId getObjectId();
/**
* Get the size of the current object.
*
* @return the size of the current object.
*/
long getSize();
}
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