/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership.  The ASF
 * licenses this file to you 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 org.apache.hadoop.yarn.server.federation.store.impl;

import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.server.federation.store.FederationStateStore;
import org.apache.hadoop.yarn.server.federation.store.metrics.FederationStateStoreClientMetrics;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterId;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterInfo;
import org.apache.hadoop.yarn.server.federation.store.records.SubClusterRegisterRequest;
import org.junit.Assert;
import org.junit.Test;

/**
 * Unit tests for SQLFederationStateStore.
 */
public class TestSQLFederationStateStore extends FederationStateStoreBaseTest {

  private static final String HSQLDB_DRIVER = "org.hsqldb.jdbc.JDBCDataSource";
  private static final String DATABASE_URL = "jdbc:hsqldb:mem:state";
  private static final String DATABASE_USERNAME = "SA";
  private static final String DATABASE_PASSWORD = "";

  @Override
  protected FederationStateStore createStateStore() {

    YarnConfiguration conf = new YarnConfiguration();

    conf.set(YarnConfiguration.FEDERATION_STATESTORE_SQL_JDBC_CLASS,
        HSQLDB_DRIVER);
    conf.set(YarnConfiguration.FEDERATION_STATESTORE_SQL_USERNAME,
        DATABASE_USERNAME);
    conf.set(YarnConfiguration.FEDERATION_STATESTORE_SQL_PASSWORD,
        DATABASE_PASSWORD);
    conf.set(YarnConfiguration.FEDERATION_STATESTORE_SQL_URL,
        DATABASE_URL + System.currentTimeMillis());
    super.setConf(conf);
    return new HSQLDBFederationStateStore();
  }

  @Test
  public void testSqlConnectionsCreatedCount() throws YarnException {
    FederationStateStore stateStore = getStateStore();
    SubClusterId subClusterId = SubClusterId.newInstance("SC");
    ApplicationId appId = ApplicationId.newInstance(1, 1);

    SubClusterInfo subClusterInfo = createSubClusterInfo(subClusterId);

    stateStore.registerSubCluster(
        SubClusterRegisterRequest.newInstance(subClusterInfo));
    Assert.assertEquals(subClusterInfo, querySubClusterInfo(subClusterId));

    addApplicationHomeSC(appId, subClusterId);
    Assert.assertEquals(subClusterId, queryApplicationHomeSC(appId));

    // Verify if connection is created only once at statestore init
    Assert.assertEquals(1,
        FederationStateStoreClientMetrics.getNumConnections());
  }
}