ConversationalInterceptor.java

package net.ftlines.blog.cdidemo.cdi;

import java.util.HashMap;
import java.util.Map;

import javax.inject.Inject;
import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;

import org.jboss.weld.context.ConversationContext;
import org.jboss.weld.context.bound.Bound;
import org.jboss.weld.context.bound.BoundConversationContext;
import org.jboss.weld.context.bound.BoundRequest;
import org.jboss.weld.context.bound.MutableBoundRequest;
import org.jboss.weld.context.http.Http;

/**
 * NB: this file is derived from the open-source project hosted at https://github.com/42Lines/blog-cdidemo
 */
@Conversational
@Interceptor
public class ConversationalInterceptor {

  @Inject
  @Http
  ConversationContext context;
  
  @Inject
  @Bound
  BoundConversationContext boundContext;

  @AroundInvoke
  public Object wrapInConversation(InvocationContext invocation) throws Exception {

    BoundRequest storage = null;

    if (!context.isActive()&&!boundContext.isActive()) {
      Map<String, Object> session = new HashMap<String, Object>();
      Map<String, Object> request = new HashMap<String, Object>();
      storage = new MutableBoundRequest(request, session);
      boundContext.associate(storage);
      boundContext.activate();
    }

    try {
      return invocation.proceed();
    } finally {
      if (storage != null) {
        boundContext.deactivate();
        boundContext.dissociate(storage);
      }
    }
  }
}