-/*
- * Copyright (c) 2013 Cisco Systems, Inc. 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.protocol.framework;
-
-import io.netty.channel.Channel;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
-import io.netty.util.concurrent.Promise;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import com.google.common.base.Preconditions;
-
-/**
- * Abstract base class for session negotiators. It implements the basic
- * substrate to implement SessionNegotiator API specification, with subclasses
- * needing to provide only
- *
- * @param <M> Protocol message type
- * @param <S> Protocol session type, has to extend ProtocolSession<M>
- */
-public abstract class AbstractSessionNegotiator<M, S extends AbstractProtocolSession<?>> extends ChannelInboundHandlerAdapter implements SessionNegotiator<S> {
- private final Logger logger = LoggerFactory.getLogger(AbstractSessionNegotiator.class);
- private final Promise<S> promise;
- protected final Channel channel;
-
- public AbstractSessionNegotiator(final Promise<S> promise, final Channel channel) {
- this.promise = Preconditions.checkNotNull(promise);
- this.channel = Preconditions.checkNotNull(channel);
- }
-
- protected abstract void startNegotiation() throws Exception;
- protected abstract void handleMessage(M msg) throws Exception;
-
- protected final void negotiationSuccessful(final S session) {
- logger.debug("Negotiation on channel {} successful with session {}", channel, session);
- channel.pipeline().replace(this, "session", session);
- promise.setSuccess(session);
- }
-
- protected final void negotiationFailed(final Throwable cause) {
- logger.debug("Negotiation on channel {} failed", channel, cause);
- channel.close();
- promise.setFailure(cause);
- }
-
- @Override
- public final void channelActive(final ChannelHandlerContext ctx) {
- logger.debug("Starting session negotiation on channel {}", channel);
- try {
- startNegotiation();
- } catch (Exception e) {
- logger.info("Unexpected negotiation failure", e);
- negotiationFailed(e);
- }
- }
-
- @Override
- public final void channelRead(final ChannelHandlerContext ctx, final Object msg) {
- logger.debug("Negotiation read invoked on channel {}", channel);
- try {
- handleMessage((M)msg);
- } catch (Exception e) {
- logger.debug("Unexpected exception during negotiation", e);
- negotiationFailed(e);
- }
- }
-}