org.apache.hadoop.hbase.client.NoncedRegionServerCallable Maven / Gradle / Ivy
/*
* 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 org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ipc.HBaseRpcController;
import org.apache.yetus.audience.InterfaceAudience;
/**
* Implementations make an rpc call against a RegionService via a protobuf Service. Implement
* #rpcCall(RpcController) and then call {@link #call(int)} to trigger the rpc. The
* {@link #call(int)} eventually invokes your #rpcCall(RpcController) meanwhile saving you having to
* write a bunch of boilerplate. The {@link #call(int)} implementation is from
* {@link RpcRetryingCaller} so rpcs are retried on fail.
*
* TODO: this class is actually tied to one region, because most of the paths make use of the
* regioninfo part of location when building requests. The only reason it works for multi-region
* requests (e.g. batch) is that they happen to not use the region parts. This could be done cleaner
* (e.g. having a generic parameter and 2 derived classes, RegionCallable and actual
* RegionServerCallable with ServerName.
* @param the class that the ServerCallable handles
*/
@InterfaceAudience.Private
public abstract class NoncedRegionServerCallable extends ClientServiceCallable {
private final long nonce;
/**
* @param connection Connection to use.
* @param tableName Table name to which row belongs.
* @param row The row we want in tableName.
*/
public NoncedRegionServerCallable(Connection connection, TableName tableName, byte[] row,
HBaseRpcController rpcController, int priority) {
super(connection, tableName, row, rpcController, priority);
this.nonce = getConnection().getNonceGenerator().newNonce();
}
long getNonceGroup() {
return getConnection().getNonceGenerator().getNonceGroup();
}
long getNonce() {
return this.nonce;
}
}