refactor code and service separation for MOAS support

Change-Id: Id00a59a46a30d3a8c976611e637c28fe609c9842
diff --git a/apps/artemis/src/main/java/org/onosproject/artemis/impl/moas/MoasServerHandler.java b/apps/artemis/src/main/java/org/onosproject/artemis/impl/moas/MoasServerHandler.java
new file mode 100644
index 0000000..d140416
--- /dev/null
+++ b/apps/artemis/src/main/java/org/onosproject/artemis/impl/moas/MoasServerHandler.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.artemis.impl.moas;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.annotations.Beta;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import org.apache.commons.lang.exception.ExceptionUtils;
+import org.onlab.packet.IpAddress;
+import org.onosproject.artemis.impl.objects.ArtemisMessage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+
+/**
+ * MOAS Server channel handler.
+ */
+@Sharable
+@Beta
+public class MoasServerHandler extends ChannelInboundHandlerAdapter {
+
+    private static final Logger log =
+            LoggerFactory.getLogger(MoasServerHandler.class);
+
+    private MoasServerController controller;
+
+    MoasServerHandler(MoasServerController controller) {
+        this.controller = controller;
+    }
+
+    @Override
+    public void channelActive(ChannelHandlerContext ctx) throws Exception {
+        final SocketAddress address = ctx.channel().remoteAddress();
+        if (!(address instanceof InetSocketAddress)) {
+            log.warn("Invalid client connection. MOAS is identified based on IP");
+            ctx.close();
+            return;
+        }
+
+        final InetSocketAddress inetAddress = (InetSocketAddress) address;
+        final String host = inetAddress.getHostString();
+        log.info("New client connected to the Server: {}", host);
+
+        controller.deviceAgent.addMoas(IpAddress.valueOf(host), ctx);
+    }
+
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws IOException {
+        ByteBuf in = (ByteBuf) msg;
+        String strMsg = in.toString(io.netty.util.CharsetUtil.US_ASCII);
+
+        ObjectMapper mapper = new ObjectMapper();
+        ArtemisMessage actObj = mapper.readValue(strMsg, ArtemisMessage.class);
+
+        controller.packetAgent.processMoasPacket(actObj, ctx);
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+        log.error(ExceptionUtils.getFullStackTrace(cause));
+        cause.printStackTrace();
+        ctx.close();
+    }
+
+}