Add a vote tracker to the app that can be used as a basis for maintai…

…ning votes. (#23)

freedomOfComputing/src/main/java/nl/tudelft/trustchain/foc/MainActivityFOC.kt

@@ -35,6 +35,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import nl.tudelft.ipv8.android.IPv8Android
 import nl.tudelft.trustchain.foc.community.FOCCommunity
+import nl.tudelft.trustchain.foc.community.FOCVoteTracker
 import nl.tudelft.trustchain.foc.databinding.ActivityMainFocBinding
 import nl.tudelft.trustchain.foc.util.ExtensionUtils.Companion.APK_DOT_EXTENSION
 import nl.tudelft.trustchain.foc.util.ExtensionUtils.Companion.TORRENT_DOT_EXTENSION
@@ -63,7 +64,7 @@ open class MainActivityFOC : AppCompatActivity() {
     private var bufferSize = 1024 * 5
     private val s = SessionManager()
     private var torrentAmount = 0
-
+    private val voteTracker: FOCVoteTracker = FOCVoteTracker()
     private var appGossiper: AppGossiper? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -106,6 +107,8 @@ open class MainActivityFOC : AppCompatActivity() {
         } catch (e: Exception) {
             printToast(e.toString())
         }
+
+        voteTracker.loadState()
     }
 
     // TODO: Remove hacky fix.
@@ -155,6 +158,7 @@ open class MainActivityFOC : AppCompatActivity() {
     override fun onPause() {
         super.onPause()
         appGossiper?.pause()
+        voteTracker.storeState()
     }
 
     private fun showAllFiles() {

freedomOfComputing/src/main/java/nl/tudelft/trustchain/foc/community/FOCVote.kt

@@ -0,0 +1,19 @@
+package nl.tudelft.trustchain.foc.community
+
+import nl.tudelft.ipv8.messaging.Deserializable
+
+data class FOCVote(val memberId: String) : nl.tudelft.ipv8.messaging.Serializable {
+    override fun serialize(): ByteArray {
+        return memberId.toByteArray()
+    }
+
+    companion object Deserializer : Deserializable<FOCMessage> {
+        override fun deserialize(
+            buffer: ByteArray,
+            offset: Int
+        ): Pair<FOCMessage, Int> {
+            val toReturn = buffer.toString(Charsets.UTF_8)
+            return Pair(FOCMessage(toReturn), buffer.size)
+        }
+    }
+}

freedomOfComputing/src/main/java/nl/tudelft/trustchain/foc/community/FOCVoteTracker.kt

@@ -0,0 +1,23 @@
+package nl.tudelft.trustchain.foc.community
+
+import android.util.Log
+
+class FOCVoteTracker {
+    // Stores the votes for all apks
+    private val voteMap: MutableMap<String, Set<FOCVote>> = mutableMapOf()
+        get() = field
+
+    /**
+     * Gets called on pause (or shutdown) of the app to persist state
+     */
+    fun storeState() {
+        Log.w("vote-tracker", "storestate")
+    }
+
+    /**
+     * Gets called on start up to load the state from disk
+     */
+    fun loadState() {
+        Log.w("vote-tracker", "load state")
+    }
+}