TransactionManagerProvider.java

/*
 * Copyright © 2014 Cask Data, Inc.
 *
 * 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 co.cask.cdap.data.runtime;

import co.cask.tephra.TransactionManager;
import co.cask.tephra.metrics.TxMetricsCollector;
import co.cask.tephra.persist.TransactionStateStorage;
import com.google.inject.Inject;
import com.google.inject.Provider;
import org.apache.hadoop.conf.Configuration;

/**
 * Google Guice Provider for {@link TransactionManager} instances.  Each call to {@link #get()} will
 * return a new {@link TransactionManager} instance.
 */
public class TransactionManagerProvider implements Provider<TransactionManager> {
  private final Configuration conf;
  private final Provider<TransactionStateStorage> storageProvider;
  private final TxMetricsCollector txMetricsCollector;

  @Inject
  public TransactionManagerProvider(Configuration config, Provider<TransactionStateStorage> storageProvider,
                                            TxMetricsCollector txMetricsCollector) {
    this.conf = config;
    this.storageProvider = storageProvider;
    this.txMetricsCollector = txMetricsCollector;
  }

  @Override
  public TransactionManager get() {
    return new TransactionManager(conf, storageProvider.get(), txMetricsCollector);
  }
}