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/*
* Copyright (C) 2009, Google Inc.
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
* 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
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.revwalk;
import java.io.IOException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
/**
* Delays commits to be at least {@link PendingGenerator#OVER_SCAN} late.
* <p>
* This helps to "fix up" weird corner cases resulting from clock skew, by
* slowing down what we produce to the caller we get a better chance to ensure
* PendingGenerator reached back far enough in the graph to correctly mark
* commits {@link RevWalk#UNINTERESTING} if necessary.
* <p>
* This generator should appear before {@link FixUninterestingGenerator} if the
* lower level {@link #pending} isn't already fully buffered.
*/
final class DelayRevQueue extends Generator {
private static final int OVER_SCAN = PendingGenerator.OVER_SCAN;
private final Generator pending;
private final FIFORevQueue delay;
private int size;
DelayRevQueue(Generator g) {
super(g.firstParent);
pending = g;
delay = new FIFORevQueue();
}
@Override
int outputType() {
return pending.outputType();
}
@Override
RevCommit next() throws MissingObjectException,
IncorrectObjectTypeException, IOException {
while (size < OVER_SCAN) {
final RevCommit c = pending.next();
if (c == null)
break;
delay.add(c);
size++;
}
final RevCommit c = delay.next();
if (c == null)
return null;
size--;
return c;
}
}
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