func NewQueryEngine(config Config) *QueryEngine {
var err error
qe := &QueryEngine{}
qe.engine, err = kvengine.NewEngine(config.EngineName)
if err != nil {
panic(NewTabletErrorDB(FATAL, err))
}
qe.connPool = NewConnectionPool("ConnPool", config.PoolSize, time.Duration(config.IdleTimeout*1e9))
qe.schemaInfo = NewSchemaInfo(config.QueryCacheSize, time.Duration(config.IdleTimeout*1e9))
qe.consolidator = NewConsolidator()
qe.maxResultSize = sync2.AtomicInt64(config.MaxResultSize)
qe.streamBufferSize = sync2.AtomicInt64(config.StreamBufferSize)
stats.Publish("MaxResultSize", stats.IntFunc(qe.maxResultSize.Get))
stats.Publish("StreamBufferSize", stats.IntFunc(qe.streamBufferSize.Get))
queryStats = stats.NewTimings("Queries")
QPSRates = stats.NewRates("QPS", queryStats, 15, 60*time.Second)
waitStats = stats.NewTimings("Waits")
errorStats = stats.NewCounters("Errors")
resultStats = stats.NewHistogram("Results", resultBuckets)
return qe
}
// NewResourcePool creates a new ResourcePool pool.
// capacity is the initial capacity of the pool.
// maxCap is the maximum capacity.
// 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(fmt.Errorf("Invalid/out of range capacity"))
}
rp := &ResourcePool{
resources: make(chan resourceWrapper, maxCap),
factory: factory,
capacity: sync2.AtomicInt64(capacity),
idleTimeout: sync2.AtomicDuration(idleTimeout),
}
for i := 0; i < capacity; i++ {
rp.resources <- resourceWrapper{}
}
return rp
}