#652 USB Tuner Error Handling Enhancements (#653)

-Separates USB timeout event processing to a dedicated thread
-Updates USB transfer buffer processor to better detect errors and auto-restart on error (max 3 times)
-Updates Tuner to add an error state and SourceManager to not select tuners with an error state
-Updates ChannelProcessingManager to auto-shutdown channels sourced from tuners set with error state
-Improves logging of USB related errors.

src/main/java/io/github/dsheirer/module/ProcessingChain.java

@@ -1,7 +1,7 @@
 /*
  *
  *  * ******************************************************************************
- *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  * Copyright (C) 2014-2020 Dennis Sheirer
  *  *
  *  * 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
@@ -115,14 +115,12 @@ public class ProcessingChain implements Listener<ChannelEvent>
     private Broadcaster<SourceEvent> mSourceEventBroadcaster = new Broadcaster<>();
     private Broadcaster<IMessage> mMessageBroadcaster = new Broadcaster<>();
     private Broadcaster<SquelchStateEvent> mSquelchStateEventBroadcaster = new Broadcaster<>();
-
     private AtomicBoolean mRunning = new AtomicBoolean();
-
-    protected Source mSource;
     private List<Module> mModules = new ArrayList<>();
     private DecodeEventModel mDecodeEventModel;
     private AbstractChannelState mChannelState;
     private MessageActivityModel mMessageActivityModel;
+    protected Source mSource;
 
     /**
      * Creates a processing chain for managing a set of modules
@@ -208,6 +206,14 @@ public class ProcessingChain implements Listener<ChannelEvent>
         return mSource != null;
     }
 
+    /**
+     * Indicates if this chain's source is the same as the source argument
+     */
+    public boolean hasSource(Source source)
+    {
+        return mSource != null && mSource.equals(source);
+    }
+
     /**
      * Applies a sample source to this processing chain.  Processing won't
      * start until the start() method is invoked.
@@ -800,6 +806,14 @@ public class ProcessingChain implements Listener<ChannelEvent>
         }
     }
 
+    /**
+     * Adds a listener to receive source events from this processing chain
+     */
+    public void addSourceEventListener(Listener<SourceEvent> listener)
+    {
+        mSourceEventBroadcaster.addListener(listener);
+    }
+
     /**
      * Removes the listener from receiving decoded messages from all decoders.
      */