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some attributes in your vendor-specific deployment descriptor. Refer to your application server documentation for details about your specific server. Use stateful session beans only when necessary We have observed gross misuse of stateful session beans, which causes developers to become disappointed with their performance. Most enterprise applications are stateless in nature, so you should determine whether you need stateful session beans. Stateless session beans perform much better than stateful session beans since they are not required to manage state. The extended persistence context is supported only with EJB 3 stateful session beans, and there is no way out if you want to use it. Later in this chapter we provide some guidelines to specifically improve performance of stateful session beans. Refactor multiple method calls to use the Session Fa ade design pattern EJB invocation is expensive, particularly when you use it remotely. You should avoid building fine-grained EJBs by following the Session Fa ade design pattern. Check to see whether you can consolidate several EJB methods into a single coarse-grained EJB method. Reducing multiple method calls to a single call will improve the performance of your EJB applications. Look at transaction attribute settings Recall from chapter 6 that transaction management is an expensive affair. Verify that each EJB method really needs a transaction. If you are using CMT (by default), the container will start a transaction for you because the default transaction attribute is Required. For methods that don t require a transaction, you should explicitly disable transactions by setting the transaction type to NOT_SUPPORTED as follows: asp.net pdf 417 ASP . NET PDF-417 Barcode Generator - Generate 2D PDF417 in ...
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Easy-to-use ASP . NET PDF417 Barcode Component, generating PDF-417 barcode images in ASP.NET, C#, VB.NET, and IIS project. The IDC file contains two important sets of information: Class definitions for all custom types that are exchanged by the Web service Abstract class definitions for each operation that the Web service supports Listing 3-4 provides the code for an IDC file for the RequestQuote operation and its associated types. @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) public List<Item> findMostPopularItems() { ... } If you are confused about which transaction options are available, refer to chapter 6, or consult your application server s documentation. Optimize the stateless bean pool Stateless session bean instances are pooled and shared by clients. You should have sufficient bean instances to serve all your concurrent clients. If you don t have enough bean instances in the pool, the client will block until an instance is available. Most application servers provide the ability to configure the bean pool asp.net pdf 417 PDF417 ASP . NET - Barcode Tools
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2 May 2019 ... NET framework. It is the second article published by this author on encoding and decoding of PDF417 barcodes. The first article is PDF417 ... in a vendor-specific deployment descriptor by specifying a value for the minimum and maximum number of instances to be kept in the bean pool. Keeping it too low will create contention issues, whereas keeping it too high may consume excessive memory. Use the Goldilocks principle here, and try to get the minimum/maximum range just right. The stateful bean cache and passivation A stateful bean is associated with a specific client. When a client needs a bean instance, the container creates a bean instance for it. However, the container cannot maintain an infinite number of active bean instances in memory while constantly passivating bean instances that are not actively being used. The container serializes all instance variables stored in a stateful bean and writes the bean s state into secondary storage (an external file) when it decides to passivate the bean instance. The passivated bean instance is activated or brought back into memory when the associated client invokes a method on a bean instance that has been temporarily pushed out of the cache. Unnecessary passivation and activation will slow down the performance of your applications. Investigate your server s configuration options in order to properly set the bean cache or passivation policy so that frequent passivation and activation is avoided. Use a remove method for stateful beans You must destroy a stateful bean instance by using the @Remove annotation when the conversation ends. As explained in chapter 3, any business method can be annotated with @Remove so that upon successful completion of that business method, the bean instance will be destroyed. Take a look at confirmOrder: asp.net pdf 417 ASP . NET Barcode Demo - PDF417 Standard - Demos - Telerik
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It can work with Code128, PDF417 and many other symbologies. ... annoyingly split it along technology lines ( Barcode Professional "...for ASP . Instead of pinning objects while calling a blocking API, you should consider operating on a copied native state instead In the worst case, this can imply two copy operations, one before the native pointer is passed to a native function, and one after the native function has returned to copy the modified state back It can also imply further synchronization overhead to prevent another thread from reading the intermediate state that resides in the managed array before the modified state is copied back There are different ways to copy data from managed memory to unmanaged memory and back. @Remove public Long confirmOrder() { } If you do not remove stateful bean instances when they are no longer needed, then the number of inactive (essentially dead) instances will grow, forcing passivation/activation in the container. In addition to @Remove, most containers provide the ability to time out and destroy a bean instance by setting an expiration time in the vendor-specific deployment descriptor. This timeout can be used to help keep the number of bean instances to a manageable number. Its purpose is to set a timer for beans that are not used by clients for longer than the specified expiration time. We recommend you take advantage of this timeout to reduce the time that unused bean instances hang around, soaking up space. Listing 3-4. The IDC File for the RequestQuote Operation and Its Associated Types using using using using using System; System.Web.Services; System.Web.Services.Description; System.Web.Services.Protocols; System.Xml.Serialization; asp.net pdf 417 Create PDF 417 barcode in asp . net WEB Application | DaniWeb
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