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// Copyright (C) 2012 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.googlesource.gerrit.plugins.replication;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.Table;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.eclipse.jgit.transport.RemoteRefUpdate;
import org.eclipse.jgit.transport.URIish;
public class ReplicationState {
private boolean allScheduled;
private final PushResultProcessing pushResultProcessing;
private final Lock countingLock = new ReentrantLock();
private final CountDownLatch allPushTasksFinished = new CountDownLatch(1);
private static class RefReplicationStatus {
private final String project;
private final String ref;
private int nodesToReplicateCount;
private int replicatedNodesCount;
RefReplicationStatus(String project, String ref) {
this.project = project;
this.ref = ref;
}
public boolean allDone() {
return replicatedNodesCount == nodesToReplicateCount;
}
}
private final Table<String, String, RefReplicationStatus> statusByProjectRef;
private int totalPushTasksCount;
private int finishedPushTasksCount;
public ReplicationState(PushResultProcessing processing) {
pushResultProcessing = processing;
statusByProjectRef = HashBasedTable.create();
}
public void increasePushTaskCount(String project, String ref) {
countingLock.lock();
try {
getRefStatus(project, ref).nodesToReplicateCount++;
totalPushTasksCount++;
} finally {
countingLock.unlock();
}
}
public boolean hasPushTask() {
return totalPushTasksCount != 0;
}
public void notifyRefReplicated(
String project,
String ref,
URIish uri,
RefPushResult status,
RemoteRefUpdate.Status refUpdateStatus) {
pushResultProcessing.onRefReplicatedToOneNode(project, ref, uri, status, refUpdateStatus);
RefReplicationStatus completedRefStatus = null;
boolean allPushTaksCompleted = false;
countingLock.lock();
try {
RefReplicationStatus refStatus = getRefStatus(project, ref);
refStatus.replicatedNodesCount++;
finishedPushTasksCount++;
if (allScheduled) {
if (refStatus.allDone()) {
completedRefStatus = statusByProjectRef.remove(project, ref);
}
allPushTaksCompleted = finishedPushTasksCount == totalPushTasksCount;
}
} finally {
countingLock.unlock();
}
if (completedRefStatus != null) {
doRefPushTasksCompleted(completedRefStatus);
}
if (allPushTaksCompleted) {
doAllPushTasksCompleted();
}
}
public void markAllPushTasksScheduled() {
countingLock.lock();
try {
allScheduled = true;
if (finishedPushTasksCount < totalPushTasksCount) {
return;
}
} finally {
countingLock.unlock();
}
doAllPushTasksCompleted();
}
private void doAllPushTasksCompleted() {
fireRemainingOnRefReplicatedToAllNodes();
pushResultProcessing.onAllRefsReplicatedToAllNodes(totalPushTasksCount);
allPushTasksFinished.countDown();
}
/**
* Some could be remaining if replication of a ref is completed before all tasks are scheduled.
*/
private void fireRemainingOnRefReplicatedToAllNodes() {
for (RefReplicationStatus refStatus : statusByProjectRef.values()) {
doRefPushTasksCompleted(refStatus);
}
}
private void doRefPushTasksCompleted(RefReplicationStatus refStatus) {
pushResultProcessing.onRefReplicatedToAllNodes(
refStatus.project, refStatus.ref, refStatus.nodesToReplicateCount);
}
private RefReplicationStatus getRefStatus(String project, String ref) {
if (!statusByProjectRef.contains(project, ref)) {
RefReplicationStatus refStatus = new RefReplicationStatus(project, ref);
statusByProjectRef.put(project, ref, refStatus);
return refStatus;
}
return statusByProjectRef.get(project, ref);
}
public void waitForReplication() throws InterruptedException {
allPushTasksFinished.await();
}
public void writeStdOut(String message) {
pushResultProcessing.writeStdOut(message);
}
public void writeStdErr(String message) {
pushResultProcessing.writeStdErr(message);
}
public enum RefPushResult {
/** The ref was not successfully replicated. */
FAILED,
/** The ref is not configured to be replicated. */
NOT_ATTEMPTED,
/** The ref was successfully replicated. */
SUCCEEDED;
@Override
public String toString() {
return name().toLowerCase().replace("_", "-");
}
}
}
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