Migrates channel notes to LargeCache

app/src/main/java/com/vitorpamplona/amethyst/model/Channel.kt

@@ -22,9 +22,11 @@ package com.vitorpamplona.amethyst.model
 
 import androidx.compose.runtime.Stable
 import androidx.lifecycle.LiveData
+import com.vitorpamplona.amethyst.commons.data.LargeCache
 import com.vitorpamplona.amethyst.service.NostrSingleChannelDataSource
 import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.ui.components.BundledUpdate
+import com.vitorpamplona.amethyst.ui.dal.DefaultFeedOrder
 import com.vitorpamplona.amethyst.ui.note.toShortenHex
 import com.vitorpamplona.quartz.encoders.ATag
 import com.vitorpamplona.quartz.encoders.Hex
@@ -33,7 +35,6 @@ import com.vitorpamplona.quartz.encoders.toNote
 import com.vitorpamplona.quartz.events.ChannelCreateEvent
 import com.vitorpamplona.quartz.events.LiveActivitiesEvent
 import kotlinx.coroutines.Dispatchers
-import java.util.concurrent.ConcurrentHashMap
 
 @Stable
 class PublicChatChannel(idHex: String) : Channel(idHex) {
@@ -110,7 +111,7 @@ abstract class Channel(val idHex: String) {
 
     var updatedMetadataAt: Long = 0
 
-    val notes = ConcurrentHashMap<HexKey, Note>()
+    val notes = LargeCache<HexKey, Note>()
 
     open fun id() = Hex.decode(idHex)
 
@@ -145,7 +146,7 @@ abstract class Channel(val idHex: String) {
     }
 
     fun addNote(note: Note) {
-        notes[note.idHex] = note
+        notes.put(note.idHex, note)
     }
 
     fun removeNote(note: Note) {
@@ -163,18 +164,18 @@ abstract class Channel(val idHex: String) {
 
     fun pruneOldAndHiddenMessages(account: Account): Set<Note> {
         val important =
-            notes.values
-                .filter { it.author?.let { it1 -> account.isHidden(it1) } == false }
-                .sortedWith(compareBy({ it.createdAt() }, { it.idHex }))
-                .reversed()
-                .take(1000)
+            notes.filter { key, it ->
+                it.author?.let { author -> account.isHidden(author) } == false
+            }
+                .sortedWith(DefaultFeedOrder)
+                .take(500)
                 .toSet()
 
-        val toBeRemoved = notes.values.filter { it !in important }.toSet()
+        val toBeRemoved = notes.filter { key, it -> it !in important }
 
         toBeRemoved.forEach { notes.remove(it.idHex) }
 
-        return toBeRemoved
+        return toBeRemoved.toSet()
     }
 }
 

app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt

@@ -1780,9 +1780,9 @@ object LocalCache {
 
             removeFromCache(childrenToBeRemoved)
 
-            if (toBeRemoved.size > 100 || it.value.notes.size > 100) {
+            if (toBeRemoved.size > 100 || it.value.notes.size() > 100) {
                 println(
-                    "PRUNE: ${toBeRemoved.size} messages removed from ${it.value.toBestDisplayName()}. ${it.value.notes.size} kept",
+                    "PRUNE: ${toBeRemoved.size} messages removed from ${it.value.toBestDisplayName()}. ${it.value.notes.size()} kept",
                 )
             }
         }

app/src/main/java/com/vitorpamplona/amethyst/model/Note.kt

@@ -171,7 +171,8 @@ open class Note(val idHex: String) {
             event is LiveActivitiesEvent
         ) {
             (event as? ChannelMessageEvent)?.channel()
-                ?: (event as? ChannelMetadataEvent)?.channel() ?: (event as? ChannelCreateEvent)?.id
+                ?: (event as? ChannelMetadataEvent)?.channel()
+                ?: (event as? ChannelCreateEvent)?.id
                 ?: (event as? LiveActivitiesChatMessageEvent)?.activity()?.toTag()
                 ?: (event as? LiveActivitiesEvent)?.address()?.toTag()
         } else {

app/src/main/java/com/vitorpamplona/amethyst/model/ParticipantListBuilder.kt

@@ -96,7 +96,7 @@ class ParticipantListBuilder {
             it.replyTo?.forEach { addFollowsThatDirectlyParticipateOnToSet(it, followingSet, mySet) }
         }
 
-        LocalCache.getChannelIfExists(baseNote.idHex)?.notes?.values?.forEach {
+        LocalCache.getChannelIfExists(baseNote.idHex)?.notes?.forEach { key, it ->
             addFollowsThatDirectlyParticipateOnToSet(it, followingSet, mySet)
         }
 

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/ChannelFeedFilter.kt

@@ -31,10 +31,11 @@ class ChannelFeedFilter(val channel: Channel, val account: Account) : AdditiveFe
 
     // returns the last Note of each user.
     override fun feed(): List<Note> {
-        return channel.notes.values
-            .filter { account.isAcceptable(it) }
-            .sortedWith(compareBy({ it.createdAt() }, { it.idHex }))
-            .reversed()
+        return sort(
+            channel.notes.filterIntoSet { key, it ->
+                account.isAcceptable(it)
+            },
+        )
     }
 
     override fun applyFilter(collection: Set<Note>): Set<Note> {

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/ChatroomListKnownFeedFilter.kt

@@ -56,15 +56,12 @@ class ChatroomListKnownFeedFilter(val account: Account) : AdditiveFeedFilter<Not
                 .selectedChatsFollowList()
                 .mapNotNull { LocalCache.getChannelIfExists(it) }
                 .mapNotNull { it ->
-                    it.notes.values
-                        .filter { account.isAcceptable(it) && it.event != null }
-                        .sortedWith(compareBy({ it.createdAt() }, { it.idHex }))
-                        .lastOrNull()
+                    it.notes.filter { key, it -> account.isAcceptable(it) && it.event != null }
+                        .sortedWith(DefaultFeedOrder)
+                        .firstOrNull()
                 }
 
-        return (privateMessages + publicChannels)
-            .sortedWith(compareBy({ it.createdAt() }, { it.idHex }))
-            .reversed()
+        return (privateMessages + publicChannels).sortedWith(DefaultFeedOrder)
     }
 
     override fun updateListWith(

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/DiscoverLiveFeedFilter.kt

@@ -48,9 +48,8 @@ open class DiscoverLiveFeedFilter(
     }
 
     override fun feed(): List<Note> {
-        val allChannelNotes =
-            LocalCache.channels.values.mapNotNull { LocalCache.getNoteIfExists(it.idHex) }
-        val allMessageNotes = LocalCache.channels.values.map { it.notes.values }.flatten()
+        val allChannelNotes = LocalCache.channels.values.mapNotNull { LocalCache.getNoteIfExists(it.idHex) }
+        val allMessageNotes = LocalCache.channels.values.map { it.notes.filter { key, it -> it.event is LiveActivitiesEvent } }.flatten()
 
         val notes = innerApplyFilter(allChannelNotes + allMessageNotes)
 

commons/src/main/java/com/vitorpamplona/amethyst/commons/data/LargeCache.kt

@@ -32,6 +32,17 @@ class LargeCache<K, V> {
 
     fun size() = cache.size
 
+    fun isEmpty() = cache.isEmpty()
+
+    fun containsKey(key: K) = cache.containsKey(key)
+
+    fun put(
+        key: K,
+        value: V,
+    ) {
+        cache.put(key, value)
+    }
+
     fun getOrCreate(
         key: K,
         builder: (key: K) -> V,