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// Copyright (C) 2014 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.pgm.util;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.lifecycle.LifecycleModule;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gwtorm.server.OrmException;
import com.google.gwtorm.server.SchemaFactory;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Module to bind a single {@link ReviewDb} instance per thread.
*
* <p>New instances are opened on demand, but are closed only at shutdown.
*/
class PerThreadReviewDbModule extends LifecycleModule {
private final SchemaFactory<ReviewDb> schema;
@Inject
PerThreadReviewDbModule(SchemaFactory<ReviewDb> schema) {
this.schema = schema;
}
@Override
protected void configure() {
final List<ReviewDb> dbs = Collections.synchronizedList(new ArrayList<ReviewDb>());
final ThreadLocal<ReviewDb> localDb = new ThreadLocal<>();
bind(ReviewDb.class)
.toProvider(
new Provider<ReviewDb>() {
@Override
public ReviewDb get() {
ReviewDb db = localDb.get();
if (db == null) {
try {
db = schema.open();
dbs.add(db);
localDb.set(db);
} catch (OrmException e) {
throw new ProvisionException("unable to open ReviewDb", e);
}
}
return db;
}
});
listener()
.toInstance(
new LifecycleListener() {
@Override
public void start() {
// Do nothing.
}
@Override
public void stop() {
for (ReviewDb db : dbs) {
db.close();
}
}
});
}
}
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