Renamed packages to org.opendaylight.openflowjava.protocol.impl.*

[openflowjava.git] / openflow-protocol-impl / src / main / java / org / opendaylight / openflowjava / protocol / impl / core / OFFrameDecoder.java

diff --git a/openflow-protocol-impl/src/main/java/org/opendaylight/openflowjava/protocol/impl/core/OFFrameDecoder.java b/openflow-protocol-impl/src/main/java/org/opendaylight/openflowjava/protocol/impl/core/OFFrameDecoder.java
new file mode 100644 (file)
index 0000000..650fe3b
--- /dev/null
+++ b/openflow-protocol-impl/src/main/java/org/opendaylight/openflowjava/protocol/impl/core/OFFrameDecoder.java
@@ -0,0 +1,74 @@
+/* Copyright (C)2013 Pantheon Technologies, s.r.o. All rights reserved. */
+
+package org.opendaylight.openflowjava.protocol.impl.core;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ByteToMessageDecoder;
+
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.opendaylight.openflowjava.protocol.impl.core.TcpHandler.COMPONENT_NAMES;
+
+/**
+ * Class for decoding incoming messages into message frames.
+ *
+ * @author michal.polkorab
+ */
+public class OFFrameDecoder extends ByteToMessageDecoder {
+
+    /** Length of OpenFlow 1.3 header */
+    public static final byte LENGTH_OF_HEADER = 8;
+    private static final byte LENGTH_INDEX_IN_HEADER = 2;
+    private static final Logger LOGGER = LoggerFactory.getLogger(OFFrameDecoder.class);
+
+    /**
+     * Constructor of class.
+     */
+    public OFFrameDecoder() {
+        LOGGER.info("Creating OFFrameDecoder");
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+        LOGGER.warn("Unexpected exception from downstream.", cause);
+        ctx.close();
+    }
+
+    @Override
+    protected void decode(ChannelHandlerContext chc, ByteBuf bb, List<Object> list) throws Exception {
+        if (bb.readableBytes() < LENGTH_OF_HEADER) {
+            LOGGER.debug("skipping bb - too few data for header");
+            return;
+        }
+
+        int length = bb.getUnsignedShort(LENGTH_INDEX_IN_HEADER);
+        if (bb.readableBytes() < length) {
+            LOGGER.debug("skipping bb - too few data for msg");
+            return;
+        }
+
+        LOGGER.info("OF Protocol message received");
+
+        enableOFVersionDetector(chc);
+
+        List<String> componentList = chc.pipeline().names();
+        LOGGER.debug(componentList.toString());
+
+        ByteBuf messageBuffer = bb.slice(bb.readerIndex(), length);
+        list.add(messageBuffer);
+        messageBuffer.retain();
+        bb.skipBytes(length);
+    }
+
+    private static void enableOFVersionDetector(ChannelHandlerContext ctx) {
+        if (ctx.pipeline().get(COMPONENT_NAMES.OF_VERSION_DETECTOR.name()) == null) {
+            LOGGER.info("Adding OFVD");
+            ctx.pipeline().addLast(COMPONENT_NAMES.OF_VERSION_DETECTOR.name(), new OFVersionDetector());
+        } else {
+            LOGGER.debug("OFVD already in pipeline");
+        }
+    }
+}