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/*
* 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
*
* 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 org.apache.hadoop.hbase.client;
import static org.apache.hadoop.hbase.client.ConnectionUtils.createClosestRowAfter;
import static org.apache.hadoop.hbase.client.ConnectionUtils.isEmptyStartRow;
import static org.apache.hadoop.hbase.client.ConnectionUtils.noMoreResultsForScan;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
import org.apache.yetus.audience.InterfaceAudience;
/**
* ClientSimpleScanner implements a sync scanner behaviour. The cache is a simple list. The prefetch
* is invoked only when the application finished processing the entire cache.
*/
@InterfaceAudience.Private
public class ClientSimpleScanner extends ClientScanner {
public ClientSimpleScanner(Configuration configuration, Scan scan, Scan scanForMetrics,
TableName name, ClusterConnection connection, RpcRetryingCallerFactory rpcCallerFactory,
RpcControllerFactory rpcControllerFactory, ExecutorService pool, int scanReadRpcTimeout,
int scannerTimeout, int replicaCallTimeoutMicroSecondScan,
ConnectionConfiguration connectionConfiguration, Map requestAttributes)
throws IOException {
super(configuration, scan, scanForMetrics, name, connection, rpcCallerFactory,
rpcControllerFactory, pool, scanReadRpcTimeout, scannerTimeout,
replicaCallTimeoutMicroSecondScan, connectionConfiguration, requestAttributes);
}
@Override
protected boolean setNewStartKey() {
if (noMoreResultsForScan(scan, currentRegion)) {
return false;
}
scan.withStartRow(currentRegion.getEndKey(), true);
return true;
}
@Override
protected ScannerCallable createScannerCallable() {
if (!scan.includeStartRow() && !isEmptyStartRow(scan.getStartRow())) {
// we have not implemented locate to next row for sync client yet, so here we change the
// inclusive of start row to true.
scan.withStartRow(createClosestRowAfter(scan.getStartRow()), true);
}
return new ScannerCallable(getConnection(), getTable(), scan, this.scanMetrics,
this.rpcControllerFactory, getScanReplicaId(), requestAttributes);
}
}
