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Viewing changes to drizzled/plugin/transaction_replicator.cc

This patch adds the following functionality:

* Removes the need to manually enable replicators in order
  for an applier to work.
* Removes the enabled/disabled setting of both transaction
  applier plugins and transaction replicator plugins
* Pairs a replicator with an applier into a "ReplicationStream"
  and removes all checks for "enabled" replicators and appliers
* Allows modules that implement a TransactionApplier (such as
  the transaction_log module) to specify which replicator to
  use via a configuration variable.  For instance, the transaction
  log module now has --transaction-log-use-replicator=[default|filtered..]
  instead of the user having to do --default-replicator-enable and such
* Adds a new data dictionary table for REPLICATION_STREAMS, which
  allows querying of activated replication-to-applier streams
  managed by drizzled::ReplicationServices

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Lines of Context:
drizzled/plugin/transaction_replicator.cc
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bool plugin::TransactionReplicator::addPlugin(plugin::TransactionReplicator *replicator)
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{
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  ReplicationServices &replication_services= ReplicationServices::singleton();
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  /** @TODO ReplicationServices should indicate error in some way here */
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  replication_services.attachReplicator(replicator);
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  return false;
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}