com.eucalyptus.context.ContextPropagationChannelInterceptor.java Source code

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Here is the source code for com.eucalyptus.context.ContextPropagationChannelInterceptor.java

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/*************************************************************************
 * (c) Copyright 2016 Hewlett Packard Enterprise Development Company LP
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 ************************************************************************/
package com.eucalyptus.context;

import org.springframework.integration.channel.interceptor.ThreadStatePropagationChannelInterceptor;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import com.google.common.base.Optional;
import edu.ucsb.eucalyptus.msgs.BaseMessage;

/**
 *
 */
@SuppressWarnings({ "Guava", "OptionalUsedAsFieldOrParameterType" })
public class ContextPropagationChannelInterceptor
        extends ThreadStatePropagationChannelInterceptor<Optional<Context>> {

    @Override
    protected Optional<Context> obtainPropagatingContext(final Message<?> message,
            final MessageChannel messageChannel) {
        Optional<Context> context = Optional.fromNullable(Contexts.threadLocal());
        final String correlationId = message.getPayload() instanceof BaseMessage
                ? ((BaseMessage) message.getPayload()).getCorrelationId()
                : null;
        if (!context.isPresent() || !context.get().getCorrelationId().equals(correlationId)) {
            if (Contexts.exists(correlationId)) {
                try {
                    final Context messageContext = Contexts.lookup(correlationId);
                    context = Optional.of(messageContext);
                } catch (NoSuchContextException ignored) {
                }
            }
        }
        return context;
    }

    @Override
    protected void populatePropagatedContext(final Optional<Context> contextOptional, final Message<?> message,
            final MessageChannel messageChannel) {
        Contexts.threadLocal(contextOptional.orNull());
    }
}