damus

commit 89bb293acd2480e1f670ed2625452e0ed8773e6c
parent f9c330aebf9167158cc6938e7ba85410b185d972
Author: Bryan Montz <bryanmontz@me.com>
Date:   Sun,  5 Mar 2023 07:28:51 -0600

Prune EventCache when iOS fires memory warning

Closes: #736

Diffstat:
M
damus/Util/EventCache.swift
 | 
18
++++++++++++++----

1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/damus/Util/EventCache.swift b/damus/Util/EventCache.swift
@@ -5,17 +5,23 @@
 //  Created by William Casarin on 2023-02-21.
 //
 
+import Combine
 import Foundation
+import UIKit
 
 class EventCache {
-    private var events: [String: NostrEvent]
-    private var replies: ReplyMap = ReplyMap()
+    private var events: [String: NostrEvent] = [:]
+    private var replies = ReplyMap()
+    private var cancellable: AnyCancellable?
     
     //private var thread_latest: [String: Int64]
     
     init() {
-        self.events = [:]
-        self.replies = ReplyMap()
+        cancellable = NotificationCenter.default.publisher(
+            for: UIApplication.didReceiveMemoryWarningNotification
+        ).sink { [weak self] _ in
+            self?.prune()
+        }
     }
     
     func parent_events(event: NostrEvent) -> [NostrEvent] {
@@ -79,4 +85,8 @@ class EventCache {
         events[ev.id] = ev
     }
     
+    private func prune() {
+        events = [:]
+        replies.replies = [:]
+    }
 }