Revision 80d08166 include/FedReplicaManager.h
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extern "C" void * frm_loop(void *arg); |
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class SqlDB; |
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class LogDB; |
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class LogDBRecord; |
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class FedReplicaManager : public ReplicaManager, ActionListener |
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{
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public: |
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/** |
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* @param _t timer for periofic actions (sec) |
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* @param _p purge timeout for log |
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* @param d pointer to underlying DB (LogDB) |
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* @param l log_retention length (num records) |
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*/ |
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FedReplicaManager(time_t _t, time_t _p, SqlDB * d, unsigned int l);
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FedReplicaManager(LogDB * d);
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virtual ~FedReplicaManager(); |
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/** |
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* Creates a new record in the federation log and sends the replication |
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* event to the replica threads. [MASTER] |
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* @param sql db command to replicate |
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* @return 0 on success -1 otherwise |
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* Sends the replication event to the replica threads. [MASTER] |
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*/ |
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int replicate(const std::string& sql); |
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void replicate(const std::string& sql) |
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{
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ReplicaManager::replicate(); |
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} |
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/** |
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* Updates the current index in the server and applies the command to the |
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* server. It also stores the record in the zone log [SLAVE] |
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* @param index of the record |
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* @param prev of index preceding this one |
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* @param sql command to apply to DB |
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* @return 0 on success, last_index if missing records, -1 on DB error |
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*/ |
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int apply_log_record(int index, const std::string& sql); |
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int apply_log_record(int index, int prev, const std::string& sql);
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/** |
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* Record was successfully replicated on zone, increase next index and |
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update_zones(zids); |
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get_last_index(last_index); |
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ReplicaManager::start_replica_threads(zids); |
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} |
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void delete_zone(int zone_id); |
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/** |
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* Bootstrap federated log |
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*/ |
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static int bootstrap(SqlDB *_db); |
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/** |
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* @return the id of fed. replica thread |
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*/ |
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pthread_t get_thread_id() const |
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return frm_thread; |
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}; |
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/** |
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* @return the last index of the fed log (from DB to use this method in |
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* HA followers) |
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*/ |
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unsigned int get_last_index() const |
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{
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unsigned int li; |
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get_last_index(li); |
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return li; |
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} |
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private: |
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friend void * frm_loop(void *arg); |
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*/ |
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pthread_mutex_t mutex; |
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//-------------------------------------------------------------------------- |
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// Timers |
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// - timer_period. Base timer to wake up the manager |
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// - purge_period. How often the replicated log is purged (600s) |
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// - xmlrpc_timeout. To timeout xml-rpc api calls to replicate log |
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//-------------------------------------------------------------------------- |
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time_t timer_period; |
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time_t purge_period; |
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static const time_t xmlrpc_timeout_ms; |
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// ------------------------------------------------------------------------- |
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// Synchronization variables |
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// - last_index in the replication log
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// - xmlrpc_timeout. To timeout xml-rpc api calls to replicate log
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// - zones list of zones in the federation with: |
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// - list of servers <id, xmlrpc endpoint> |
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// - next index to send to this zone |
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// ------------------------------------------------------------------------- |
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static const time_t xmlrpc_timeout_ms; |
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struct ZoneServers |
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{
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ZoneServers(int z, unsigned int l, const std::string& s): |
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zone_id(z), endpoint(s), next(l){};
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zone_id(z), endpoint(s), next(l), last(-1){};
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~ZoneServers(){};
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std::string endpoint; |
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unsigned int next; |
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int next; |
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int last; |
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}; |
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std::map<int, ZoneServers *> zones; |
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unsigned int last_index; |
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SqlDB * logdb; |
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unsigned int log_retention; |
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LogDB * logdb; |
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// ------------------------------------------------------------------------- |
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// Action Listener interface |
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void finalize_action(const ActionRequest& ar); |
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/** |
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* This function is executed periodically to purge the state log |
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*/ |
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void timer_action(const ActionRequest& ar); |
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// ------------------------------------------------------------------------- |
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// Database Implementation |
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// Store log records to replicate on federation slaves |
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// ------------------------------------------------------------------------- |
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static const char * table; |
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static const char * db_names; |
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static const char * db_bootstrap; |
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/** |
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* Gets a record from the log |
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* @param index of the record |
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* @param sql command of the record |
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* @return 0 in case of success -1 otherwise |
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*/ |
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int get_log_record(int index, std::string& sql); |
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/** |
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* Inserts a new record in the log ans updates the last_index variable |
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* (memory and db) |
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* @param index of new record |
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* @param sql of DB command to execute |
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* @return 0 on success |
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*/ |
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int insert_log_record(int index, const std::string& sql); |
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/** |
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* Reads the last index from DB for initialization |
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* @param index |
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* @return 0 on success |
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*/ |
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int get_last_index(unsigned int& index) const; |
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/** |
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* Get the nest record to replicate in a zone |
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* @param zone_id of the zone |
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* @param index of the next record to send |
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* @param sql command to replicate |
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* @return 0 on success, -1 otherwise |
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*/ |
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int get_next_record(int zone_id, int& index, std::string& sql,
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std::string& zservers); |
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int get_next_record(int zone_id, std::string& zedp, LogDBRecord& lr);
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}; |
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#endif /*FED_REPLICA_MANAGER_H_*/ |
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