🚧 Add web of trust pinger and events

[Sone.git] / src / main / kotlin / net / pterodactylus / sone / freenet / wot / WebOfTrustPinger.kt

diff --git a/src/main/kotlin/net/pterodactylus/sone/freenet/wot/WebOfTrustPinger.kt b/src/main/kotlin/net/pterodactylus/sone/freenet/wot/WebOfTrustPinger.kt
new file mode 100644 (file)
index 0000000..e090133
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/freenet/wot/WebOfTrustPinger.kt
@@ -0,0 +1,50 @@
+/**
+ * Sone - WebOfTrustPinger.kt - Copyright © 2019 David ‘Bombe’ Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.freenet.wot
+
+import com.google.common.eventbus.*
+import net.pterodactylus.sone.core.event.*
+import net.pterodactylus.sone.freenet.plugin.*
+import java.util.concurrent.atomic.*
+
+/**
+ * [Runnable] that is scheduled via an [Executor][java.util.concurrent.Executor],
+ * checks whether the web of trust plugin can be communicated with, sends
+ * events if its status changes and reschedules itself.
+ */
+class WebOfTrustPinger(private val eventBus: EventBus, private val webOfTrustReacher: () -> Unit, private val reschedule: () -> Unit) : Runnable {
+
+       private val lastState = AtomicBoolean(false)
+
+       override fun run() {
+               try {
+                       webOfTrustReacher()
+                       if (!lastState.get()) {
+                               eventBus.post(WebOfTrustAppeared())
+                               lastState.set(true)
+                       }
+               } catch (e: PluginException) {
+                       if (lastState.get()) {
+                               eventBus.post(WebOfTrustDisappeared())
+                               lastState.set(false)
+                       }
+               }
+               reschedule()
+       }
+
+}