--- /dev/null
+/**
+ * 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()
+ }
+
+}