java barcode scanner api Figure 33-1: IBM Extensions for Session Beans in Java

Drawer Denso QR Bar Code in Java Figure 33-1: IBM Extensions for Session Beans

Figure 33-1: IBM Extensions for Session Beans
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Figure 33-2: IBM Extensions for Entity Beans Both session beans and entity beans can refer to a local transaction A local transaction context is created when an EJB method executes in a context that the EJB specification refers to as an unspecified context The unspecified transaction context can be active during bean creation, removal, passivation, or activation, or during the setSessionContext method Similarly, for cases in which the bean does not support transactions or does support transactions while the client is not within a transaction context, the transaction context is that of a local transaction While these cases do not appear to be the most important ones (that is, typical code will not initiate a transaction from within setSessionContext), WebSphere addresses these cases using local transactions This ensures that in every possible case, transactions can be used to ensure correct business behavior The actions that can be activated are rollback and commit, with rollback always being the default Session Bean IBM Extensions Deployment Parameters The IBM-specific deployment parameters for session beans are as follows: Timeout Timeout duration for a session bean When this timeout occurs, the bean instance is removed from the system Inheritance Root Indicates whether the enterprise bean is a root of an inheritance hierarchy Activate at Specifies the point at which a bean is activated and placed in the bean cache Possible values include the following: o Once (This is the default value) The bean is activated once it is accessed in the server process, and is passivated (paged out) at the sole discretion of the container This is sometimes called lazy activation o Transaction The bean is activated at the start of a transaction and is passivated only after this transaction has 574
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ended This parameter is relevant only for state-ful session beans (It is irrelevant for state -less beans because the container can share these among different clients) Locale Location Specifies the locale settings for the bean When retrieving message catalogs, the language used could be based either on the locale of the invoking client or on the locale of the server The possible values are Server and Caller Local Transactions Include the following: o Boundary Specifies where a local transaction begins This property is not applicable to session beans, even though the AAT allows it to be set o Unresolved Action Specifies the action to be taken by the container if an application "uncommits" resources in a local transaction The values here are Rollback (the default) and Commit
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Entity Bean IBM Extensions Deployment Parameters For entity beans, the following parameters have the same meaning as they do with session beans: Inheritance Root Locale Location Local Transactions Boundary and Unresolved Action The Bean Cache attribute of Activate At is similar to that of state -ful session beans The Load at attribute specifies when a bean is to load its state from the database Valid values are Activation and Transaction The former indicates that the bean is loaded upon activation, and the latter indicates that the bean is loaded upon a transaction The value of the Load At attribute indicates whether the EJB container is expected to have exclusive or shared database access (Activation implies exclusive access, whereas Transaction implies shared access) The setting of the Activate and Load at properties for entity beans determine the commit options that are used Commit options are part of the EJB 11 specification, and these two attributes allow the application assembler to decide which option to use Table 33-1 shows EJB 11 commit options and the corresponding bean cache settings Table 33-1: EJB 11 Commit Options and Corresponding Bean Cache Settings Commit Option Implied Mode of DB Access Exclusive Bean Cache Settings Activate at = Once Load at = Activation Comment
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Effectively minimizes database I/O by avoiding the need for ejbLoad calls The downside is that all transactions accessing the bean instance are serialized in the database as opposed to in the container, which could cause poor performance if
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Table 33-1: EJB 11 Commit Options and Corresponding Bean Cache Settings Commit Option Implied Mode of DB Access Bean Cache Settings Comment
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bean instances are concurrently accessed by multiple transactions Also, you can have only one container (no clones/WLM, other containers or any other DB applications) can access those tables B Shared Activate at = Once Load at = Transaction Increases memory requirement since it has more objects populating the cache It is possible that a single bean instance would have several copies in the cache (one per transaction) This option is preferable to option A only in cases where the bean is continuously accessed throughout the transaction (which translates into multiple ejbActivate calls, which are free since the bean is already in the cache) Reduces memory requirements by minimizing the number of cached entity beans However, it allows for multiple copies of the same instance of memory (one per transaction, as with option B) Beneficial if bean instances that are accessed concurrently are seldom updated
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