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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef DRIZZLED_REPLICATION_SERVICES_H
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#define DRIZZLED_REPLICATION_SERVICES_H
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#include "drizzled/atomics.h"
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#include "drizzled/plugin/replication.h"
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/* some forward declarations needed */
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class TransactionReplicator;
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class TransactionApplier;
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* This is a class which manages transforming internal
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* transactional events into GPB messages and sending those
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* events out through registered replicators and appliers.
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class ReplicationServices
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typedef uint64_t GlobalTransactionId;
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* Types of messages that can go in the transaction
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* log file. Every time something is written into the
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* transaction log, it is preceded by a header containing
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* the type of message which follows.
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TRANSACTION= 1, /* A GPB Transaction Message */
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BLOB= 2 /* A BLOB value */
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typedef std::pair<plugin::TransactionReplicator *, plugin::TransactionApplier *> ReplicationPair;
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typedef std::vector<ReplicationPair> ReplicationStreams;
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* Method which is called after plugins have been loaded but
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* before the first client connects. It determines if the registration
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* of applier and replicator plugins is proper and pairs
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* the applier and requested replicator plugins into the replication
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* This is only necessary because we don't yet have plugin dependency
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bool evaluateRegisteredPlugins();
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* Helper method which pushes a constructed message out to the registered
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* replicator and applier plugins.
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* @param Session descriptor
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* @param Message to push out
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plugin::ReplicationReturnCode pushTransactionMessage(Session &in_session,
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message::Transaction &to_push);
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ReplicationServices();
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* Returns the singleton instance of ReplicationServices
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static inline ReplicationServices &singleton()
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static ReplicationServices replication_services;
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return replication_services;
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* Returns whether the ReplicationServices object
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* is active. In other words, does it have both
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* a replicator and an applier that are *active*?
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bool isActive() const;
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* Returns the list of replication streams
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ReplicationStreams &getReplicationStreams();
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* Attaches a replicator to our internal collection of
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* @param Pointer to a replicator to attach/register
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void attachReplicator(plugin::TransactionReplicator *in_replicator);
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* Detaches/unregisters a replicator with our internal
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* collection of replicators.
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* @param Pointer to the replicator to detach
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void detachReplicator(plugin::TransactionReplicator *in_replicator);
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* Attaches a applier to our internal collection of
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* @param Pointer to a applier to attach/register
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* @param The name of the replicator to pair with
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void attachApplier(plugin::TransactionApplier *in_applier, const std::string &requested_replicator);
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* Detaches/unregisters a applier with our internal
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* collection of appliers.
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* @param Pointer to the applier to detach
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void detachApplier(plugin::TransactionApplier *in_applier);
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* Returns the timestamp of the last Transaction which was sent to an
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uint64_t getLastAppliedTimestamp() const;
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typedef std::vector<plugin::TransactionReplicator *> Replicators;
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typedef std::vector<std::pair<std::string, plugin::TransactionApplier *> > Appliers;
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* Atomic boolean set to true if any *active* replicators
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* or appliers are actually registered.
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* The timestamp of the last time a Transaction message was successfully
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* applied (sent to an Applier)
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atomic<uint64_t> last_applied_timestamp;
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/** Our collection of registered replicator plugins */
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Replicators replicators;
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/** Our collection of registered applier plugins and their requested replicator plugin names */
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/** Our replication streams */
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ReplicationStreams replication_streams;
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* Strips underscores and lowercases supplied replicator name
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* or requested name, and appends the suffix "replicator" if missing...
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void normalizeReplicatorName(std::string &name);
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} /* namespace drizzled */
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#endif /* DRIZZLED_REPLICATION_SERVICES_H */
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#ifndef DRIZZLED_REPLICATOR_H
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#define DRIZZLED_REPLICATOR_H
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#include <drizzled/plugin_replicator.h>
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int replicator_initializer (st_plugin_int *plugin);
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int replicator_finalizer (st_plugin_int *plugin);
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/* todo, fill in this API */
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/* these are the functions called by the rest of the drizzle server
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to do whatever this plugin does. */
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bool replicator_session_init (Session *session);
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bool replicator_write_row(Session *session, Table *table);
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bool replicator_update_row(Session *session, Table *table,
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const unsigned char *before,
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const unsigned char *after);
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bool replicator_delete_row(Session *session, Table *table);
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/* The below control transactions */
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bool replicator_end_transaction(Session *session, bool autocommit, bool commit);
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bool replicator_rollback_to_savepoint(Session *session, void *save_point);
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bool replicator_savepoint_set(Session *session, void *save_point);
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bool replicator_prepare(Session *session);
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#endif /* DRIZZLED_REPLICATOR_H */