/*
* 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.data2.transaction.coprocessor;
import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.data2.transaction.snapshot.SnapshotCodecV1;
import co.cask.cdap.data2.transaction.snapshot.SnapshotCodecV2;
import co.cask.cdap.data2.util.hbase.ConfigurationTable;
import co.cask.tephra.coprocessor.TransactionStateCache;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import java.io.IOException;
/**
* Extends the {@link TransactionStateCache} implementation for
* transaction coprocessors with a version that reads transaction configuration properties from
* {@link ConfigurationTable}. This allows the coprocessors to pick up configuration changes without requiring
* a restart.
*/
public class DefaultTransactionStateCache extends TransactionStateCache {
// CDAP versions of coprocessors must reference snapshot classes so they get included in generated jar file
// DO NOT REMOVE
private static final SnapshotCodecV1 codecV1 = null;
private static final SnapshotCodecV2 codecV2 = null;
private String tableNamespace;
private ConfigurationTable configTable;
public DefaultTransactionStateCache(String tableNamespace) {
this.tableNamespace = tableNamespace;
}
@Override
public void setConf(Configuration conf) {
super.setConf(conf);
this.configTable = new ConfigurationTable(conf);
}
@Override
protected Configuration getSnapshotConfiguration() throws IOException {
CConfiguration cConf = configTable.read(ConfigurationTable.Type.DEFAULT, tableNamespace);
Configuration txConf = HBaseConfiguration.create();
cConf.copyTxProperties(txConf);
return txConf;
}
}