From a3c540a952b5136b1de2900c8947847f70b39446 Mon Sep 17 00:00:00 2001
From: Evgeny S Maksimov <me@vragam.net>
Date: Fri, 1 Feb 2019 00:56:35 +0300
Subject: Frame decoder refactoring

---
 src/org/traccar/protocol/NavisFrameDecoder.java | 30 ++++++++++++++++---------
 src/org/traccar/protocol/NavisProtocol.java     |  5 ++---
 2 files changed, 21 insertions(+), 14 deletions(-)

(limited to 'src/org/traccar')

diff --git a/src/org/traccar/protocol/NavisFrameDecoder.java b/src/org/traccar/protocol/NavisFrameDecoder.java
index 9a3b3d45c..0146243cd 100644
--- a/src/org/traccar/protocol/NavisFrameDecoder.java
+++ b/src/org/traccar/protocol/NavisFrameDecoder.java
@@ -21,20 +21,17 @@ import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.TooLongFrameException;
 import java.nio.charset.StandardCharsets;
 import org.traccar.BaseFrameDecoder;
+import org.traccar.BasePipelineFactory;
 
 public class NavisFrameDecoder extends BaseFrameDecoder {
 
+    private int flexDataSize; // bytes
+
     private static final int NTCB_HEADER_LENGTH = 16;
     private static final int NTCB_LENGTH_OFFSET = 12;
     private static final int FLEX_HEADER_LENGTH = 2;
     private static final int MAX_FRAME_LENGTH = 65551;
 
-    private final NavisProtocolDecoder protocolDecoder;
-
-    public NavisFrameDecoder(NavisProtocolDecoder protocolDecoder) {
-        this.protocolDecoder = protocolDecoder;
-    }
-
     @Override
     protected Object decode(
             ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
@@ -53,7 +50,15 @@ public class NavisFrameDecoder extends BaseFrameDecoder {
             return buf.readRetainedSlice(1);
         }
 
-        if (protocolDecoder.getFlexDataSize() > 0) {
+        if (ctx != null) {
+            NavisProtocolDecoder protocolDecoder =
+                    BasePipelineFactory.getHandler(ctx.pipeline(), NavisProtocolDecoder.class);
+            if (protocolDecoder != null) {
+                flexDataSize = protocolDecoder.getFlexDataSize();
+            }
+        }
+
+        if (flexDataSize > 0) {
             // FLEX frame
             if (buf.readableBytes() > FLEX_HEADER_LENGTH) {
                 int length = 0;
@@ -61,14 +66,13 @@ public class NavisFrameDecoder extends BaseFrameDecoder {
                 switch (type) {
                     // FLEX 1.0
                     case "~A":
-                        length = protocolDecoder.getFlexDataSize()
-                                * buf.getByte(buf.readerIndex() + FLEX_HEADER_LENGTH) + 1 + 1;
+                        length = flexDataSize  * buf.getByte(buf.readerIndex() + FLEX_HEADER_LENGTH) + 1 + 1;
                         break;
                     case "~T":
-                        length = protocolDecoder.getFlexDataSize() + 4 + 1;
+                        length = flexDataSize + 4 + 1;
                         break;
                     case "~C":
-                        length = protocolDecoder.getFlexDataSize() + 1;
+                        length = flexDataSize + 1;
                         break;
                     // FLEX 2.0 (Extra packages)
                     case "~E":
@@ -108,4 +112,8 @@ public class NavisFrameDecoder extends BaseFrameDecoder {
         return null;
     }
 
+    public void setFlexDataSize(int flexDataSize) {
+        this.flexDataSize = flexDataSize;
+    }
+
 }
diff --git a/src/org/traccar/protocol/NavisProtocol.java b/src/org/traccar/protocol/NavisProtocol.java
index 628b78fd4..db0eba8c1 100644
--- a/src/org/traccar/protocol/NavisProtocol.java
+++ b/src/org/traccar/protocol/NavisProtocol.java
@@ -25,9 +25,8 @@ public class NavisProtocol extends BaseProtocol {
         addServer(new TrackerServer(false, getName()) {
             @Override
             protected void addProtocolHandlers(PipelineBuilder pipeline) {
-                NavisProtocolDecoder protocolDecoder = new NavisProtocolDecoder(NavisProtocol.this);
-                pipeline.addLast(new NavisFrameDecoder(protocolDecoder));
-                pipeline.addLast(protocolDecoder);
+                pipeline.addLast(new NavisFrameDecoder());
+                pipeline.addLast(new NavisProtocolDecoder(NavisProtocol.this));
             }
         });
     }
-- 
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