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Although the container does most of the heavy lifting in CMT, you still need to tell the container how it should manage transactions. To understand what this means, consider the fact that the transaction which wraps around your bean s method could be started by the container specifically when calling your method, or it could be inherited from a client calling your method (otherwise called joining a transaction). Let s explore this idea a little more using our example. The placeSnagItOrder method in listing 6.1 calls a number of methods such as bidsExisting, validateCredit, chargeCustomer, and removeItemFromBidding. As figure 6.3 shows, these method calls could simply be forwarded to other session bean invocations, such as BidManagerBean.bidsExist, BillingManagerBean.validateCredit, BillingManagerBean.chargeCustomer, and ItemManagerBean.removeFromBidding. We already know that the placeSnagItOrder method is managed by a transaction. What if all the session beans we are invoking are also managed by CMT Should the container reuse the transaction created for our method to invoke the other methods Should our existing transaction be independent of the other session beans transactions What happens if any of the methods cannot support transactions The @TransactionAttribute annotation tells the container how to handle all these situations. The annotation can be applied either to individual CMT bean methods or to the entire bean. If the annotation is applied at the bean

When the joinpoint deals with a method, getArgs returns the arguments of the call. The Signature interface gives a representation of the signature of the joinpoint. When the joinpoint deals with a method, Signature provides methods for retrieving the joinpoint method s name, access modifiers (public, private, and so on), class, and return type.

Figure 6.3 The method invocations from the CMT session bean is actually forwarded to other session beans that may be using various transaction attributes.

instance try{ BytesMessage message = topicSession.createBytesMessage(); Istream = new FileInputStream(filename); while( (bytesRead = istream.read( bytes,0,bytes.length ) ) > 0 ) { message.writeBytes(bytes,0,bytesRead); Writes the data } to the message istream.close(); topicPublisher.publish(message); } catch(Exception e){ e.printStackTrace(); }

level, all business methods in the bean inherit the transaction attribute value specified by it. In listing 6.1, we specify that the value of the @TransactionAttribute annotation for the placeSnagItOrder method should be TransactionAttributeType.REQUIRED. There are six choices for this annotation defined by the enumerated type TransactionAttributeType. Table 6.2 summarizes their behavior.

Table 6.2 Effects of transaction attributes on EJB methods Caller Transaction Exists No Yes REQUIRES_NEW No Yes Effect Container creates a new transaction. Method joins the caller s transaction. Container creates a new transaction. Container creates a new transaction and the caller s transaction is suspended. No transaction is used. Method joins the caller s transaction. javax.ejb.EJBTransactionRequiredException is thrown. Method joins the caller s transaction. No transaction is used. The caller s transaction is suspended and the method is called without a transaction. No transaction is used. javax.ejb.EJBException is thrown.

} public void close() throws JMSException { topicSession.close(); topicConnection.close(); } public static void main(String[] args) { Client publisher = null; String filename = null; try{

Let s take a look at what each value means and where each is applicable. REQUIRED REQUIRED is the default and most commonly applicable transaction attribute value. This value specifies that the EJB method must always be invoked within a transaction. If the method is invoked from a nontransactional client, the container will start a transaction before the method is called and finish it when the method returns. On the other hand, if the caller invokes the method from a transactional context, the method will join the existing transaction. In case of transactions

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