#6 DMR Decoder (#947)

* #6 DMR decoder feature - work in progress

* #6 DMR Decoder.

* #6 DMR Decoder.  Code review updates.

Co-authored-by: Zhenyu Mao <maozhenyu@foxmail.com>
Co-authored-by: Denny <denny@denny-desktop>

src/main/java/io/github/dsheirer/message/MessageHistory.java

@@ -0,0 +1,72 @@
+/*
+ * *****************************************************************************
+ *  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
+ * 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 io.github.dsheirer.message;
+
+import com.google.common.eventbus.Subscribe;
+import io.github.dsheirer.module.HistoryModule;
+import io.github.dsheirer.sample.Listener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Decode event history module.  Maintains a history of decode events and constrains the total history size.
+ */
+public class MessageHistory extends HistoryModule<IMessage> implements IMessageListener
+{
+    private final static Logger mLog = LoggerFactory.getLogger(MessageHistory.class);
+
+    /**
+     * Constructs an instance
+     */
+    public MessageHistory(int historySize)
+    {
+        super(historySize);
+    }
+
+    /**
+     * Implements the IDecodeEventListener interface - delegates to receive(event) method.
+     */
+    @Override
+    public Listener<IMessage> getMessageListener()
+    {
+        return this;
+    }
+
+    /**
+     * Process a request for message history and post the response to the module event bus
+     */
+    @Subscribe
+    public void process(MessageHistoryRequest request)
+    {
+        getInterModuleEventBus().post(new MessageHistoryResponse(getItems()));
+    }
+
+    /**
+     * Processes a request to preload message history
+     */
+    @Subscribe
+    public void process(MessageHistoryPreloadData preloadData)
+    {
+        for(IMessage message: preloadData.getData())
+        {
+            receive(message);
+        }
+    }
+}

src/main/java/io/github/dsheirer/message/MessageHistoryPreloadData.java

@@ -0,0 +1,39 @@
+/*
+ * *****************************************************************************
+ *  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
+ * 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 io.github.dsheirer.message;
+
+import io.github.dsheirer.controller.channel.event.PreloadDataContent;
+
+import java.util.List;
+
+/**
+ * Message history to preload into the message history module.
+ */
+public class MessageHistoryPreloadData extends PreloadDataContent<List<IMessage>>
+{
+    /**
+     * Constructs an instance
+     * @param messages from the history
+     */
+    public MessageHistoryPreloadData(List<IMessage> messages)
+    {
+        super(messages);
+    }
+}

src/main/java/io/github/dsheirer/message/MessageHistoryRequest.java

@@ -0,0 +1,29 @@
+/*
+ * *****************************************************************************
+ *  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
+ * 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 io.github.dsheirer.message;
+
+import io.github.dsheirer.module.ModuleEventBusMessage;
+
+/**
+ * Request for message history from the message history module.
+ */
+public class MessageHistoryRequest extends ModuleEventBusMessage
+{
+}

src/main/java/io/github/dsheirer/message/MessageHistoryResponse.java

@@ -0,0 +1,49 @@
+/*
+ * *****************************************************************************
+ *  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
+ * 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 io.github.dsheirer.message;
+
+import io.github.dsheirer.module.ModuleEventBusMessage;
+
+import java.util.List;
+
+/**
+ * Response to message history request.
+ */
+public class MessageHistoryResponse extends ModuleEventBusMessage
+{
+    private List<IMessage> mMessages;
+
+    /**
+     * Constructs an instance
+     * @param messages from the history
+     */
+    public MessageHistoryResponse(List<IMessage> messages)
+    {
+        mMessages = messages;
+    }
+
+    /**
+     * Message history
+     */
+    public List<IMessage> getMessages()
+    {
+        return mMessages;
+    }
+}

src/main/java/io/github/dsheirer/message/MessageProviderModule.java

@@ -55,12 +55,6 @@ public class MessageProviderModule extends Module implements IMessageProvider
 
     }
 
-    @Override
-    public void dispose()
-    {
-
-    }
-
     public void receive(IMessage message)
     {
         if(mMessageListener != null)

src/main/java/io/github/dsheirer/message/SyncLossMessage.java

@@ -30,6 +30,22 @@ public class SyncLossMessage extends Message
 {
     private int mBitsProcessed;
     private Protocol mProtocol;
+    private int mTimeslot = 0;
+
+    /**
+     * Constructs a sync loss message.
+     *
+     * @param timestamp of the message
+     * @param bitsProcessed without a sync pattern detection of message decode
+     * @param timeslot that lost the sync
+     */
+    public SyncLossMessage(long timestamp, int bitsProcessed, Protocol protocol, int timeslot)
+    {
+        super(timestamp);
+        mBitsProcessed = bitsProcessed;
+        mProtocol = protocol;
+        mTimeslot = timeslot;
+    }
 
     /**
      * Constructs a sync loss message.
@@ -39,13 +55,21 @@ public class SyncLossMessage extends Message
      */
     public SyncLossMessage(long timestamp, int bitsProcessed, Protocol protocol)
     {
-        super(timestamp);
-        mBitsProcessed = bitsProcessed;
-        mProtocol = protocol;
+        this(timestamp, bitsProcessed, protocol, 0);
     }
 
     /**
-     * Indicates the number of bits that were processed without a sync dectection or message decode
+     * Timeslot that lost the sync
+     * @return timeslot or a default of 0
+     */
+    @Override
+    public int getTimeslot()
+    {
+        return mTimeslot;
+    }
+
+    /**
+     * Indicates the number of bits that were processed without a sync detection or message decode
      */
     public int getBitsProcessed()
     {