| /* |
| * Copyright 2015-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.openflow.controller.impl; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.Unpooled; |
| import io.netty.channel.ChannelHandler.Sharable; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.channel.ChannelOutboundHandlerAdapter; |
| import io.netty.channel.ChannelPromise; |
| import io.netty.handler.codec.EncoderException; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| import org.projectfloodlight.openflow.protocol.OFMessage; |
| import org.slf4j.Logger; |
| |
| /** |
| * Encode an openflow message for output into a netty channel, for use in a |
| * netty pipeline. |
| */ |
| @Sharable |
| public final class OFMessageEncoder extends ChannelOutboundHandlerAdapter { |
| |
| private static final Logger log = getLogger(OFMessageEncoder.class); |
| |
| private static final OFMessageEncoder INSTANCE = new OFMessageEncoder(); |
| |
| public static OFMessageEncoder getInstance() { |
| return INSTANCE; |
| } |
| |
| private OFMessageEncoder() {} |
| |
| protected final void encode(ChannelHandlerContext ctx, |
| Iterable<OFMessage> msgs, |
| ByteBuf out) { |
| |
| msgs.forEach(msg -> msg.writeTo(out)); |
| } |
| |
| // MessageToByteEncoder without dependency to TypeParameterMatcher |
| @Override |
| public void write(ChannelHandlerContext ctx, |
| Object msg, |
| ChannelPromise promise) { |
| |
| ByteBuf buf = null; |
| try { |
| if (msg instanceof Iterable) { |
| @SuppressWarnings("unchecked") |
| Iterable<OFMessage> ofmsgs = (Iterable<OFMessage>) msg; |
| buf = ctx.alloc().ioBuffer(); |
| |
| encode(ctx, ofmsgs, buf); |
| |
| if (buf.isReadable()) { |
| ctx.write(buf, promise); |
| } else { |
| log.warn("NOTHING WAS WRITTEN for {}", msg); |
| buf.release(); |
| ctx.write(Unpooled.EMPTY_BUFFER, promise); |
| } |
| buf = null; |
| |
| } else { |
| log.warn("Attempted to encode unexpected message: {}", msg); |
| ctx.write(msg, promise); |
| } |
| } catch (EncoderException e) { |
| log.error("EncoderException handling {}", msg, e); |
| throw e; |
| } catch (Throwable e) { |
| log.error("Exception handling {}", msg, e); |
| throw new EncoderException(e); |
| } finally { |
| if (buf != null) { |
| buf.release(); |
| } |
| } |
| } |
| |
| } |