fix: Remove AsyncTask in the send function (it's deprecated) (#197)

Author: eliaslecomte

android/src/main/java/com/tradle/react/UdpSenderTask.java

@@ -7,8 +7,6 @@
 
 package com.tradle.react;
 
-import android.os.AsyncTask;
-
 import java.io.IOException;
 import java.lang.ref.WeakReference;
 import java.net.DatagramPacket;
@@ -18,24 +16,32 @@
 /**
  * Specialized AsyncTask that transmits data in the background, and notifies listeners of the result.
  */
-public class UdpSenderTask extends AsyncTask<UdpSenderTask.SenderPacket, Void, Void> {
+public class UdpSenderTask implements Runnable {
     private static final String TAG = "UdpSenderTask";
 
-    private DatagramSocket mSocket;
-    private WeakReference<OnDataSentListener> mListener;
+    private final DatagramSocket mSocket;
+    private final WeakReference<OnDataSentListener> mListener;
+
+    private SocketAddress mSocketAddress;
+    private byte[] mData;
 
-    public UdpSenderTask(DatagramSocket socket, OnDataSentListener listener) {
+    public UdpSenderTask(DatagramSocket socket, OnDataSentListener listener, SocketAddress socketAddress, byte[] data) {
         this.mSocket = socket;
-        this.mListener = new WeakReference<OnDataSentListener>(listener);
+        this.mListener = new WeakReference<>(listener);
+        this.mSocketAddress = socketAddress;
+        this.mData = data;
     }
 
     @Override
-    protected Void doInBackground(SenderPacket... params) {
+    public void run() {
         OnDataSentListener listener = mListener.get();
 
         try {
-            SenderPacket packet = params[0];
-            mSocket.send(new DatagramPacket(packet.data, packet.data.length, packet.socketAddress));
+            if (mSocket == null) {
+                return;
+            }
+
+            mSocket.send(new DatagramPacket(mData, mData.length, mSocketAddress));
 
             if (listener != null) {
                 listener.onDataSent(this);
@@ -49,16 +55,6 @@ protected Void doInBackground(SenderPacket... params) {
                 listener.onDataSentRuntimeException(this, rte);
             }
         }
-
-        return null;
-    }
-
-    /**
-     * Simple class to marshall outgoing data across to this AsyncTask
-     */
-    public static class SenderPacket {
-        SocketAddress socketAddress;
-        byte[] data;
     }
 
     /**

android/src/main/java/com/tradle/react/UdpSocketClient.java

@@ -15,6 +15,9 @@
 import java.net.UnknownHostException;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
 
 import static com.tradle.react.UdpSenderTask.OnDataSentListener;
 
@@ -25,13 +28,15 @@ public final class UdpSocketClient implements UdpReceiverTask.OnDataReceivedList
     private final OnDataReceivedListener mReceiverListener;
     private final OnRuntimeExceptionListener mExceptionListener;
 
+    private ExecutorService executor = Executors.newSingleThreadExecutor();
+
     private UdpReceiverTask mReceiverTask;
 
     private final Map<UdpSenderTask, Callback> mPendingSends;
     private DatagramSocket mSocket;
     private boolean mIsMulticastSocket = false;
 
-    public UdpSocketClient(OnDataReceivedListener receiverListener,  OnRuntimeExceptionListener exceptionListener) {
+    public UdpSocketClient(OnDataReceivedListener receiverListener, OnRuntimeExceptionListener exceptionListener) {
         this.mReceiverListener = receiverListener;
         this.mExceptionListener = exceptionListener;
         this.mPendingSends = new ConcurrentHashMap<>();
@@ -125,18 +130,15 @@ public void send(String base64String, Integer port, String address, @Nullable Ca
 
         byte[] data = Base64.decode(base64String, Base64.NO_WRAP);
 
-        UdpSenderTask task = new UdpSenderTask(mSocket, this);
-        UdpSenderTask.SenderPacket packet = new UdpSenderTask.SenderPacket();
-        packet.data = data;
-        packet.socketAddress = new InetSocketAddress(InetAddress.getByName(address), port);
+        UdpSenderTask task = new UdpSenderTask(mSocket, this, new InetSocketAddress(InetAddress.getByName(address), port), data);
 
         if (callback != null) {
             synchronized (mPendingSends) {
                 mPendingSends.put(task, callback);
             }
         }
 
-        task.execute(packet);
+        executor.submit(task);
     }
 
     /**
@@ -157,6 +159,9 @@ public void close() {
             mReceiverTask.terminate();
         }
 
+        // stop pending send tasks
+        executor.shutdownNow();
+
         // close the socket
         if (mSocket != null && !mSocket.isClosed()) {
             mSocket.close();

android/src/main/java/com/tradle/react/UdpSockets.java

@@ -66,7 +66,7 @@ public void run() {
     }
 
     /**
-     * Private method to retrieve clients. Must be called from a GuardedAsyncTask for thread-safety.
+     * Private method to retrieve clients.
      */
     private UdpSocketClient findClient(final Integer cId, final Callback callback) {
         final UdpSocketClient client = mClients.get(cId);