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107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2018, OpenNebula Project, OpenNebula Systems */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#ifndef REPLICA_REQUEST_H_
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#define REPLICA_REQUEST_H_
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#include "SyncRequest.h"
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/**
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* This class represents a log entry replication request. The replication request
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* is synchronous: once it has been replicated in a majority of followers the
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* client is notified (SqlDB::exec_wr() call) and DB updated.
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*/
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class ReplicaRequest : public SyncRequest
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{
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public:
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ReplicaRequest(unsigned int i):_index(i), _to_commit(-1), _replicas(1){};
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~ReplicaRequest(){};
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/**
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* This function updates the number of replicas of the record and decrement
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* the number of servers left to reach majority consensus. If it reaches 0,
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* the client is notified
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* @return number of replicas for this log
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*/
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int inc_replicas()
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{
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int __replicas;
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_replicas++;
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if ( _to_commit > 0 )
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{
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_to_commit--;
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}
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__replicas = _replicas;
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if ( _to_commit == 0 )
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{
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result = true;
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timeout = false;
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notify();
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}
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return __replicas;
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}
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/* ---------------------------------------------------------------------- */
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/* Class access methods */
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/* ---------------------------------------------------------------------- */
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int index()
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{
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return _index;
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}
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int replicas()
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{
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return _replicas;
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}
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int to_commit()
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{
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return _to_commit;
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}
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void to_commit(int c)
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{
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_to_commit = c;
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}
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private:
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/**
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* Index for this log entry
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*/
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unsigned int _index;
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/**
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* Remaining number of servers that need to replicate this record to commit
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* it. Initialized to ( Number_Servers - 1 ) / 2
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*/
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int _to_commit;
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/**
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* Total number of replicas for this entry
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*/
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int _replicas;
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};
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#endif /*REPLICA_REQUEST_H_*/
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