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The code executed in the init method takes care of looking up the DataSource object For this to work, the DataSource object should have been created in advance by the Web administrator and stored in the naming service using the WebSphere Administrative Console (discussed in 42) For the lookup, we need to create a JNDI naming context whose parameters are provided v a properties container Keep in mind that the ia init method is the best place to perform the JNDI lookup, since it is not likely that the datasource will change during the lifetime of a servlet instance Thus, we perform this operation only once and save time when serving HTTP requests As part of the doGet method, the connection is retrieved from the datasource and not from the driver manager While it may seem that getting a connection from the datasource and from the driver manager are similar, the two options have different implications on the application If the DataSource object has the correct settings, it will implement connection pooling in a transparent manner and improve performance, scalability, and reliability Although we invoke the close method on the connection, the datasource doesn't actually disconnect from the database, because it might need to use the database later on To summarize, the idea is to access the DataSource object in the init method and to subsequently use it to get the connections, implicitly making use of pooling When using the connection obtained from the datasource, you might want to handle two possible exceptions: ConnectionPreemptedException Occurs if the servlet doesn't use a connection for a long period of time In this case, the underlying mechanism grabs the connection to make better use of it ConnectionTimeoutException Occurs if the pool is empty when a getConnection request is made that is, no connections are available at the time of the call, nor are any made available during the specified timeout Because database connections are reusable resources central to the smooth operation of the application server, WebSphere cannot rely on application code to function correctly If application code misbehaves and does not return the connection to the pool, the connection must be taken "forcefully" In a client-server environment, a misbehaving client affects only a single user In a three-tier architecture, however, where database resources are among the most important shared resources, misbehaving application code might theoretically cause the entire server to run out of resources The server must therefore protect itself by reclaiming connections that it judges have been freed from the application code, even if the application code has not surrendered the connections gracefully In such cases, ConnectionPreemptedException is thrown WebSphere implementation of pooling has a few exceptions of its own, which are described in the next section An important note is that DataSource doesn't support pooling as part of the standard; this support is implementation dependent So when using other implementations of JDBC 20, you cannot count on this feature being available And while we're on the subject of different implementations, you should note that older versions of WebSphere implemented their own mechanisms for connection pooling through the "connection manager," implemented in the comibmservletconnmgr package The connection manager is no longer supported in version 40 If you have some old WebSphere applications implemented using the connection manager, it shouldn't be difficult to upgrade them to use DataSource objects, because the underlying design model is similar, and what was previously called IBMConnSpec can now be replaced with a DataSource object As discussed, one of the main motivations for connection pooling is performance Setting the size of the connection pool is very important Having a large connection pool 314. .net upc-a reader . NET Barcode Reader Library | C# & VB. NET UPC-A Recognition ...
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The Universal Product Code ( UPC ) (redundantly: UPC code) is a barcode symbology that is .... read UPC -like labels with his ring wand. In addition to reading regular labels, he read the large two-page centerfold label in the proposal booklet. can improve response time and availability because it increases the chances of a servlet getting a free connection from the pool upon request On the other hand, maintaining a large connection pool takes up large amounts of memory, and might degrade performance WebSphere Connection Pooling WebSphere's implementation of the JDBC 20 DataSource interface provides several properties that can be used for fine -tuning the performance of connection pooling These properties are WebSphere-specific and are associated with comibmwebsphereadvancedcmfactoryDataSourceFactory They are listed, along with their meanings, in Table 18-1 Table 18-1: Connection Pooling Properties Property CONN_TIMEOUT Meaning The maximum time (in seconds) for an application to wait for a connection before timing out and throwing a ConnectionWaitTimeoutExcepti on The default is 180 seconds Setting this value to 0 disables connection timeout exceptions The vendor-specific DataSource object used by WebSphere to connect to the database This class should implement javaxsql ConnectionPoolDataSource or javaxsqlXADataSource Indicates whether connections are to be closed at the end of each transaction The default is false, which means that upon the completion of a transaction the connection is returned to the pool (and any attempt to use the connection will cause a StaleConnectionException) Setting this value to true implies that connections are not returned to the pool at the end a transaction and that the application must explicitly return the connection to the pool by calling close() This property is used for mapping SQLException objects to WebSphere exceptions; it is rarely of interest to application developers The duration of time (in seconds) during which a connection can remain free in the pool without being used After this time elapses, the connection is closed and removed from the pool The default value is 1800 Setting this value to 0 disables this timeout Note 315 .net upc-a reader C#. NET UPC-A Barcode Reader /Scanner Library | How to Read ...
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