001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.client; 019 020import org.apache.yetus.audience.InterfaceAudience; 021 022/** 023 * NonceGenerator interface. In general, nonce group is an ID (one per client, or region+client, or 024 * whatever) that could be used to reduce collision potential, or be used by compatible server nonce 025 * manager to optimize nonce storage and removal. See HBASE-3787. 026 */ 027@InterfaceAudience.Private 028public interface NonceGenerator { 029 030 static final String CLIENT_NONCES_ENABLED_KEY = "hbase.client.nonces.enabled"; 031 032 /** Returns the nonce group (client ID) of this client manager. */ 033 long getNonceGroup(); 034 035 /** Returns New nonce. */ 036 long newNonce(); 037}