org.apache.hudi.org.apache.hadoop.hbase.client.PerClientRandomNonceGenerator 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 java.util.Arrays;
import java.util.Random;
import org.apache.hadoop.hbase.HConstants;
import org.apache.yetus.audience.InterfaceAudience;
/**
* NonceGenerator implementation that uses client ID hash + random int as nonce group, and random
* numbers as nonces.
*/
@InterfaceAudience.Private
public final class PerClientRandomNonceGenerator implements NonceGenerator {
private static final PerClientRandomNonceGenerator INST = new PerClientRandomNonceGenerator();
private final Random rdm = new Random();
private final long clientId;
private PerClientRandomNonceGenerator() {
byte[] clientIdBase = ClientIdGenerator.generateClientId();
this.clientId = (((long) Arrays.hashCode(clientIdBase)) << 32) + rdm.nextInt();
}
@Override
public long getNonceGroup() {
return this.clientId;
}
@Override
public long newNonce() {
long result = HConstants.NO_NONCE;
do {
result = rdm.nextLong();
} while (result == HConstants.NO_NONCE);
return result;
}
/**
* Get the singleton nonce generator.
*/
public static PerClientRandomNonceGenerator get() {
return INST;
}
}