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// Copyright (C) 2013 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.google.gerrit.lucene;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.collect.Lists;
import com.google.gerrit.server.index.ChangeIndex;
import com.google.gerrit.server.index.IndexCollection;
import com.google.gerrit.server.index.SiteIndexer;
import com.google.gerrit.server.project.ProjectCache;
import com.google.inject.Inject;
import com.google.inject.assistedinject.Assisted;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.List;
public class OnlineReindexer {
private static final Logger log = LoggerFactory
.getLogger(OnlineReindexer.class);
public interface Factory {
OnlineReindexer create(int version);
}
private final IndexCollection indexes;
private final SiteIndexer batchIndexer;
private final ProjectCache projectCache;
private final int version;
@Inject
OnlineReindexer(
IndexCollection indexes,
SiteIndexer batchIndexer,
ProjectCache projectCache,
@Assisted int version) {
this.indexes = indexes;
this.batchIndexer = batchIndexer;
this.projectCache = projectCache;
this.version = version;
}
public void start() {
Thread t = new Thread() {
@Override
public void run() {
reindex();
}
};
t.setName(String.format("Reindex v%d-v%d",
version(indexes.getSearchIndex()), version));
t.start();
}
private static int version(ChangeIndex i) {
return i.getSchema().getVersion();
}
private void reindex() {
ChangeIndex index = checkNotNull(indexes.getWriteIndex(version),
"not an active write schema version: %s", version);
log.info("Starting online reindex from schema version {} to {}",
version(indexes.getSearchIndex()), version(index));
SiteIndexer.Result result =
batchIndexer.indexAll(index, projectCache.all());
if (!result.success()) {
log.error("Online reindex of schema version {} failed", version(index));
return;
}
indexes.setSearchIndex(index);
log.info("Reindex complete, using schema version {}", version(index));
try {
index.markReady(true);
} catch (IOException e) {
log.warn("Error activating new schema version {}", version(index));
}
List<ChangeIndex> toRemove = Lists.newArrayListWithExpectedSize(1);
for (ChangeIndex i : indexes.getWriteIndexes()) {
if (version(i) != version(index)) {
toRemove.add(i);
}
}
for (ChangeIndex i : toRemove) {
try {
i.markReady(false);
indexes.removeWriteIndex(version(i));
} catch (IOException e) {
log.warn("Error deactivating old schema version {}", version(i));
}
}
}
}