// newExecutor creates an Executor and registers a callback on the
// system config.
func newExecutor(db client.DB, gossip *gossip.Gossip, clock *hlc.Clock) *Executor {
exec := &Executor{
db: db,
reCache: parser.NewRegexpCache(512),
}
gossip.RegisterSystemConfigCallback(exec.updateSystemConfig)
return exec
}
// newExecutor creates an Executor and registers a callback on the
// system config.
func newExecutor(db client.DB, gossip *gossip.Gossip, leaseMgr *LeaseManager) *Executor {
exec := &Executor{
db: db,
reCache: parser.NewRegexpCache(512),
leaseMgr: leaseMgr,
}
exec.systemConfigCond = sync.NewCond(&exec.systemConfigMu)
gossip.RegisterSystemConfigCallback(exec.updateSystemConfig)
return exec
}
// RefreshLeases starts a goroutine that refreshes the lease manager
// leases for tables received in the latest system configuration via gossip.
func (m *LeaseManager) RefreshLeases(s *stop.Stopper, db *client.DB, gossip *gossip.Gossip) {
s.RunWorker(func() {
descKeyPrefix := keys.MakeTablePrefix(uint32(DescriptorTable.ID))
gossip.RegisterSystemConfigCallback(m.updateSystemConfig)
for {
select {
case <-m.newConfig:
// Read all tables and their versions
cfg := m.getSystemConfig()
if log.V(2) {
log.Info("received a new config %v", cfg)
}
// Loop through the configuration to find all the tables.
for _, kv := range cfg.Values {
if kv.Value.Tag != roachpb.ValueType_BYTES {
continue
}
if !bytes.HasPrefix(kv.Key, descKeyPrefix) {
continue
}
// Attempt to unmarshal config into a table/database descriptor.
var descriptor Descriptor
if err := kv.Value.GetProto(&descriptor); err != nil {
log.Warningf("unable to unmarshal descriptor %v", kv.Value)
continue
}
switch union := descriptor.Union.(type) {
case *Descriptor_Table:
table := union.Table
if err := table.Validate(); err != nil {
log.Errorf("received invalid table descriptor: %v", table)
continue
}
if log.V(2) {
log.Infof("refreshing lease table: %d, version: %d", table.ID, table.Version)
}
// Try to refresh the table lease to one >= this version.
if err := m.refreshLease(db, table.ID, table.Version); err != nil {
log.Warning(err)
}
case *Descriptor_Database:
// Ignore.
}
}
case <-s.ShouldStop():
return
}
}
})
}
// NewExecutor creates an Executor and registers a callback on the
// system config.
func NewExecutor(db client.DB, gossip *gossip.Gossip) *Executor {
exec := &Executor{db: db}
gossip.RegisterSystemConfigCallback(exec.updateSystemConfig)
return exec
}
