fix Thread.sleep for Android - this fixes #6644

java/src/main/java/org/whispersystems/signalservice/api/util/SignalThread.java

@@ -0,0 +1,24 @@
+/**
+ * Copyright (C) 2014-2016 Open Whisper Systems
+ *
+ * Licensed according to the LICENSE file in this repository.
+ */
+
+package org.whispersystems.signalservice.api.util;
+
+import org.whispersystems.signalservice.internal.util.Util;
+
+public class SignalThread {
+
+    private static boolean active = false;
+
+    public static synchronized void onTrigger() {
+        active = true;
+        SignalThread.class.notifyAll();
+    }
+
+    public static synchronized void sleep(long millis) {
+        Util.wait(SignalThread.class, active ? 0 : millis);
+    }
+
+}

java/src/main/java/org/whispersystems/signalservice/internal/websocket/WebSocketConnection.java

@@ -6,6 +6,7 @@
 import org.whispersystems.libsignal.util.Pair;
 import org.whispersystems.signalservice.api.push.TrustStore;
 import org.whispersystems.signalservice.api.util.CredentialsProvider;
+import org.whispersystems.signalservice.api.util.SignalThread;
 import org.whispersystems.signalservice.api.websocket.ConnectivityListener;
 import org.whispersystems.signalservice.internal.util.BlacklistingTrustManager;
 import org.whispersystems.signalservice.internal.util.Util;
@@ -42,7 +43,7 @@
 public class WebSocketConnection extends WebSocketListener {
 
   private static final String TAG                       = WebSocketConnection.class.getSimpleName();
-  private static final int    KEEPALIVE_TIMEOUT_SECONDS = 55;
+  private static final int    KEEPALIVE_TIMEOUT_SECONDS = 60;
 
   private final LinkedList<WebSocketRequestMessage>              incomingRequests = new LinkedList<>();
   private final Map<Long, SettableFuture<Pair<Integer, String>>> outgoingRequests = new HashMap<>();
@@ -297,7 +298,7 @@ private class KeepAliveSender extends Thread {
     public void run() {
       while (!stop.get()) {
         try {
-          Thread.sleep(TimeUnit.SECONDS.toMillis(KEEPALIVE_TIMEOUT_SECONDS));
+          SignalThread.sleep(TimeUnit.SECONDS.toMillis(KEEPALIVE_TIMEOUT_SECONDS));
 
           Log.w(TAG, "Sending keep alive...");
           sendKeepAlive();