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/*
* Copyright (C) 2016, 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
* 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.internal.ketch;
import static org.eclipse.jgit.internal.ketch.KetchReplica.State.OFFLINE;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.lib.ObjectId;
/** A snapshot of a leader and its view of the world. */
public class LeaderSnapshot {
final List<ReplicaSnapshot> replicas = new ArrayList<>();
KetchLeader.State state;
long term;
LogIndex headIndex;
LogIndex committedIndex;
boolean idle;
LeaderSnapshot() {
}
/** @return unmodifiable view of configured replicas. */
public Collection<ReplicaSnapshot> getReplicas() {
return Collections.unmodifiableList(replicas);
}
/** @return current state of the leader. */
public KetchLeader.State getState() {
return state;
}
/**
* @return {@code true} if the leader is not running a round to reach
* consensus, and has no rounds queued.
*/
public boolean isIdle() {
return idle;
}
/**
* @return term of this leader. Valid only if {@link #getState()} is
* currently {@link KetchLeader.State#LEADER}.
*/
public long getTerm() {
return term;
}
/**
* @return end of the leader's log; null if leader hasn't started up enough
* to begin its own election.
*/
@Nullable
public LogIndex getHead() {
return headIndex;
}
/**
* @return state the leader knows is committed on a majority of participant
* replicas. Null until the leader instance has committed a log
* index within its own term.
*/
@Nullable
public LogIndex getCommitted() {
return committedIndex;
}
@Override
public String toString() {
StringBuilder s = new StringBuilder();
s.append(isIdle() ? "IDLE" : "RUNNING"); //$NON-NLS-1$ //$NON-NLS-2$
s.append(" state ").append(getState()); //$NON-NLS-1$
if (getTerm() > 0) {
s.append(" term ").append(getTerm()); //$NON-NLS-1$
}
s.append('\n');
s.append(String.format(
"%-10s %12s %12s\n", //$NON-NLS-1$
"Replica", "Accepted", "Committed")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
s.append("------------------------------------\n"); //$NON-NLS-1$
debug(s, "(leader)", getHead(), getCommitted()); //$NON-NLS-1$
s.append('\n');
for (ReplicaSnapshot r : getReplicas()) {
debug(s, r);
s.append('\n');
}
s.append('\n');
return s.toString();
}
private static void debug(StringBuilder b, ReplicaSnapshot s) {
KetchReplica replica = s.getReplica();
debug(b, replica.getName(), s.getAccepted(), s.getCommitted());
b.append(String.format(" %-8s %s", //$NON-NLS-1$
replica.getParticipation(), s.getState()));
if (s.getState() == OFFLINE) {
String err = s.getErrorMessage();
if (err != null) {
b.append(" (").append(err).append(')'); //$NON-NLS-1$
}
}
}
private static void debug(StringBuilder s, String name,
ObjectId accepted, ObjectId committed) {
s.append(String.format(
"%-10s %-12s %-12s", //$NON-NLS-1$
name, str(accepted), str(committed)));
}
static String str(ObjectId c) {
if (c instanceof LogIndex) {
return ((LogIndex) c).describeForLog();
} else if (c != null) {
return c.abbreviate(8).name();
}
return "-"; //$NON-NLS-1$
}
}
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