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9seconds
2022-08-04 18:39:00 +03:00
parent 008e17cdff
commit 6a19ded78e
26 changed files with 319 additions and 344 deletions
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events/event_stream.go
+1 -1
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@@ -9,7 +9,7 @@ import (
"github.com/OneOfOne/xxhash"
)
// EventStream is a default implementation of the mtglib.EventStream
// EventStream is a default implementation of the [mtglib.EventStream]
// interface.
//
// EventStream manages a set of goroutines, observers. Main
events/init.go
+20 -20
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@@ -1,19 +1,19 @@
// Events has a default implementations of EventStream for mtglib.
//
// Please see documentation for mtglib.EventStream interface to get an
// idea of such an abstraction. This package has implementations for the
// default event stream.
// Please see documentation for [mtglib.EventStream] interface to get an idea
// of such an abstraction. This package has implementations for the default
// event stream.
//
// Default event stream has a list of its own concepts. First, all it
// does is a routing of messages to known observers. It takes an event,
// defines its type and pass this message to a method of the observer.
// Default event stream has a list of its own concepts. First, all it does is a
// routing of messages to known observers. It takes an event, defines its type
// and pass this message to a method of the observer.
//
// There might be many observers, but default event stream has a
// guarantee though. It uses StreamID as a sharding key and guarantees
// that a message with the same StreamID will be devlivered to the same
// observer instance. So, each producer is guarateed to get all relevant
// messages related to the same session. It is not possible that it will
// get EventFinish if it has not seen EventStart for that session yet.
// There might be many observers, but default event stream has a guarantee
// though. It uses StreamID as a sharding key and guarantees that a message
// with the same StreamID will be devlivered to the same observer instance. So,
// each producer is guarateed to get all relevant messages related to the same
// session. It is not possible that it will get EventFinish if it has not seen
// EventStart for that session yet.
package events
import "github.com/9seconds/mtg/v2/mtglib"
@@ -21,10 +21,10 @@ import "github.com/9seconds/mtg/v2/mtglib"
// Observer is an instance that listens for the incoming events.
//
// As it is said in the package description, the default event stream
// guarantees that all events with the same StreamID are going to be
// routed to the same instance of the observer. So, there is no need
// to synchronize information about streams between many observers
// instances, they can have their local storage.
// guarantees that all events with the same StreamID are going to be routed to
// the same instance of the observer. So, there is no need to synchronize
// information about streams between many observers instances, they can have
// their local storage.
type Observer interface {
// EventStart reacts on incoming mtglib.EventStart event.
EventStart(mtglib.EventStart)
@@ -65,8 +65,8 @@ type Observer interface {
// ObserverFactory creates a new instance of the observer.
//
// Default event stream creates a small set of goroutines to manage
// incoming messages. Each message is routed to an appropriate observer
// based on a sharding key, stream id. So, it is possible that an
// instance of mtg will have many observer instances, not a single one.
// Default event stream creates a small set of goroutines to manage incoming
// messages. Each message is routed to an appropriate observer based on a
// sharding key, stream id. So, it is possible that an instance of mtg will
// have many observer instances, not a single one.
type ObserverFactory func() Observer