// NewTxPool creates a new TxPool. It's not operational until it's Open'd.
func NewTxPool(
name string,
txStatsPrefix string,
capacity int,
timeout time.Duration,
poolTimeout time.Duration,
idleTimeout time.Duration,
enablePublishStats bool,
qStats *QueryServiceStats) *TxPool {
txStatsName := ""
if enablePublishStats {
txStatsName = txStatsPrefix + "Transactions"
}
axp := &TxPool{
pool: NewConnPool(name, capacity, idleTimeout, enablePublishStats, qStats),
activePool: pools.NewNumbered(),
lastID: sync2.NewAtomicInt64(time.Now().UnixNano()),
timeout: sync2.NewAtomicDuration(timeout),
poolTimeout: sync2.NewAtomicDuration(poolTimeout),
ticks: timer.NewTimer(timeout / 10),
txStats: stats.NewTimings(txStatsName),
queryServiceStats: qStats,
}
// Careful: pool also exports name+"xxx" vars,
// but we know it doesn't export Timeout.
if enablePublishStats {
stats.Publish(name+"Timeout", stats.DurationFunc(axp.timeout.Get))
stats.Publish(name+"PoolTimeout", stats.DurationFunc(axp.poolTimeout.Get))
}
return axp
}
// NewTabletServer creates an instance of TabletServer. Only one instance
// of TabletServer can be created per process.
func NewTabletServer(config Config) *TabletServer {
tsv := &TabletServer{
config: config,
QueryTimeout: sync2.NewAtomicDuration(time.Duration(config.QueryTimeout * 1e9)),
BeginTimeout: sync2.NewAtomicDuration(time.Duration(config.TxPoolTimeout * 1e9)),
checkMySQLThrottler: sync2.NewSemaphore(1, 0),
streamHealthMap: make(map[int]chan<- *querypb.StreamHealthResponse),
sessionID: Rand(),
history: history.New(10),
}
tsv.qe = NewQueryEngine(tsv, config)
tsv.invalidator = NewRowcacheInvalidator(config.StatsPrefix, tsv, tsv.qe, config.EnablePublishStats)
if config.EnablePublishStats {
stats.Publish(config.StatsPrefix+"TabletState", stats.IntFunc(func() int64 {
tsv.mu.Lock()
state := tsv.state
tsv.mu.Unlock()
return state
}))
stats.Publish(config.StatsPrefix+"QueryTimeout", stats.DurationFunc(tsv.QueryTimeout.Get))
stats.Publish(config.StatsPrefix+"BeginTimeout", stats.DurationFunc(tsv.BeginTimeout.Get))
stats.Publish(config.StatsPrefix+"TabletStateName", stats.StringFunc(tsv.GetState))
}
return tsv
}
// NewResourcePool creates a new ResourcePool pool.
// capacity is the number of active resources in the pool:
// there can be up to 'capacity' of these at a given time.
// maxCap specifies the extent to which the pool can be resized
// in the future through the SetCapacity function.
// You cannot resize the pool beyond maxCap.
// If a resource is unused beyond idleTimeout, it's discarded.
// An idleTimeout of 0 means that there is no timeout.
func NewResourcePool(factory Factory, capacity, maxCap int, idleTimeout time.Duration) *ResourcePool {
if capacity <= 0 || maxCap <= 0 || capacity > maxCap {
panic(errors.New("invalid/out of range capacity"))
}
rp := &ResourcePool{
resources: make(chan resourceWrapper, maxCap),
factory: factory,
capacity: sync2.NewAtomicInt64(int64(capacity)),
idleTimeout: sync2.NewAtomicDuration(idleTimeout),
}
for i := 0; i < capacity; i++ {
rp.resources <- resourceWrapper{}
}
return rp
}