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Viewing changes to plugin/transaction_log/module.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:
plugin/transaction_log/module.cc
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 * for managing write buffers
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 */
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static uint32_t sysvar_transaction_log_num_write_buffers= 8;
 
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/**
 
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 * Transaction Log plugin system variable - The name of the replicator plugin
 
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 * to pair the transaction log's applier with.  Defaults to "default"
 
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 */
 
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static char *sysvar_transaction_log_use_replicator= NULL;
 
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static const char DEFAULT_USE_REPLICATOR[]= "default";
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/** DATA_DICTIONARY views */
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static TransactionLogTool *transaction_log_tool;
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      return 1;
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    }
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    context.add(transaction_log_applier);
 
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    ReplicationServices &replication_services= ReplicationServices::singleton();
 
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    string replicator_name(sysvar_transaction_log_use_replicator);
 
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    replication_services.attachApplier(transaction_log_applier, replicator_name);
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    /* Setup DATA_DICTIONARY views */
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                          NULL, /* update func*/
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                          DEFAULT_LOG_FILE_PATH /* default */);
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static DRIZZLE_SYSVAR_STR(use_replicator,
 
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                          sysvar_transaction_log_use_replicator,
 
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                          PLUGIN_VAR_READONLY,
 
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                          N_("Name of the replicator plugin to use (default='default_replicator')"),
 
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                          NULL, /* check func */
 
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                          NULL, /* update func*/
 
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                          DEFAULT_USE_REPLICATOR /* default */);
 
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static DRIZZLE_SYSVAR_BOOL(enable_checksum,
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                           sysvar_transaction_log_checksum_enabled,
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                           PLUGIN_VAR_NOCMDARG,
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  DRIZZLE_SYSVAR(enable_checksum),
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  DRIZZLE_SYSVAR(sync_method),
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  DRIZZLE_SYSVAR(num_write_buffers),
 
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  DRIZZLE_SYSVAR(use_replicator),
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  NULL
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};
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