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Merge pull request #7917 from vector-im/feature/bma/viewEventReplay 

View event replay
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Benoit Marty 2023-01-10 14:10:14 +01:00 committed by GitHub
parent 4f829f11d8 02c61d3fb5
commit ac482b1389
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1 changed files with 12 additions and 5 deletions
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17
vector/src/main/java/im/vector/app/core/utils/SharedEvent.kt
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@ -16,16 +16,18 @@
package im.vector.app.core.utils
import im.vector.app.core.platform.VectorViewEvents
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.MutableSharedFlow
import kotlinx.coroutines.flow.onEach
import kotlinx.coroutines.flow.transform
import java.util.concurrent.CopyOnWriteArraySet
interface SharedEvents<out T> {
interface SharedEvents<out T : VectorViewEvents> {
fun stream(consumerId: String): Flow<T>
}
class EventQueue<T>(capacity: Int) : SharedEvents<T> {
class EventQueue<T : VectorViewEvents>(capacity: Int) : SharedEvents<T> {
private val innerQueue = MutableSharedFlow<OneTimeEvent<T>>(replay = capacity)
@ -33,7 +35,12 @@ class EventQueue<T>(capacity: Int) : SharedEvents<T> {
innerQueue.tryEmit(OneTimeEvent(event))
}
override fun stream(consumerId: String): Flow<T> = innerQueue.filterNotHandledBy(consumerId)
override fun stream(consumerId: String): Flow<T> = innerQueue
.onEach {
// Ensure that buffered Events will not be sent again to new subscribers.
innerQueue.resetReplayCache()
}
.filterNotHandledBy(consumerId)
}
/**
@ -42,7 +49,7 @@ class EventQueue<T>(capacity: Int) : SharedEvents<T> {
*
* Keeps track of who has already handled its content.
*/
private class OneTimeEvent<out T>(private val content: T) {
private class OneTimeEvent<out T : VectorViewEvents>(private val content: T) {
private val handlers = CopyOnWriteArraySet<String>()
@ -53,6 +60,6 @@ private class OneTimeEvent<out T>(private val content: T) {
fun getIfNotHandled(asker: String): T? = if (handlers.add(asker)) content else null
}
private fun <T> Flow<OneTimeEvent<T>>.filterNotHandledBy(consumerId: String): Flow<T> = transform { event ->
private fun <T : VectorViewEvents> Flow<OneTimeEvent<T>>.filterNotHandledBy(consumerId: String): Flow<T> = transform { event ->
event.getIfNotHandled(consumerId)?.let { emit(it) }
}