Integrate OpenFlowJava into OpenFlowPlugin build

[openflowplugin.git] / samples / simple-client / src / main / java / org / opendaylight / openflowjava / protocol / impl / clients / SimpleClientFramer.java

diff --git a/samples/simple-client/src/main/java/org/opendaylight/openflowjava/protocol/impl/clients/SimpleClientFramer.java b/samples/simple-client/src/main/java/org/opendaylight/openflowjava/protocol/impl/clients/SimpleClientFramer.java
new file mode 100644 (file)
index 0000000..02c9cd9
--- /dev/null
+++ b/samples/simple-client/src/main/java/org/opendaylight/openflowjava/protocol/impl/clients/SimpleClientFramer.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+
+package org.opendaylight.openflowjava.protocol.impl.clients;
+
+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;
+
+/**
+ * Class for decoding incoming messages into message frames.
+ *
+ * @author michal.polkorab
+ */
+public class SimpleClientFramer 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 LOG = LoggerFactory.getLogger(SimpleClientFramer.class);
+
+    /**
+     * Constructor of class.
+     */
+    public SimpleClientFramer() {
+        LOG.trace("Creating OFFrameDecoder");
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+        LOG.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) {
+            LOG.debug("skipping bb - too few data for header: {}", bb.readableBytes());
+            return;
+        }
+
+        int length = bb.getUnsignedShort(bb.readerIndex() + LENGTH_INDEX_IN_HEADER);
+        if (bb.readableBytes() < length) {
+            LOG.debug("skipping bb - too few data for msg: {} < {}", bb.readableBytes(), length);
+            return;
+        }
+        LOG.debug("OF Protocol message received, type:{}", bb.getByte(bb.readerIndex() + 1));
+
+        ByteBuf messageBuffer = bb.slice(bb.readerIndex(), length);
+        list.add(messageBuffer);
+        messageBuffer.retain();
+        bb.skipBytes(length);
+    }
+
+}