2d barcode vb.net BACKENDQUEUEPROCESSORFACTORY: GETTING IT OUT OF HIBERNATE SEARCH S WAY in Java

Painting Data Matrix 2d barcode in Java BACKENDQUEUEPROCESSORFACTORY: GETTING IT OUT OF HIBERNATE SEARCH S WAY

BACKENDQUEUEPROCESSORFACTORY: GETTING IT OUT OF HIBERNATE SEARCH S WAY
Data Matrix ECC200 Drawer In Java
Using Barcode printer for Java Control to generate, create Data Matrix ECC200 image in Java applications.
www.OnBarcode.com
Recognizing DataMatrix In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Now that we have a list of Lucene index changes to apply, we need to apply them. The most obvious solution is to fire up Lucene and delegate the work to the library. This is essentially what LuceneBackendQueueProcessor does. The work isn t as easy as it sounds, because you need to acquire locks to various Lucene indexes in a way that prevents deadlocks and should take care of Hibernate Search sharding strategies (see section 9.4). It s unlikely that you ll need to adjust this implementation. More surprisingly, LuceneBackendQueueProcessor isn t the only implementation Hibernate Search provides. Another implementation named JMSBackendQueueProcessorFactory sends the Lucene change list to a JMS queue instead of processing it locally. You ve already started to see some of the benefits of JMS as a distributed model in section 5.3.3, and you ll see more in chapter 10. Some people, for one reason or another, want to use a different communication layer than JMS (probably because of the myth that JMS is heavyweight). Implementing a custom BackendQueueProcessorFactory is the perfect solution for that. A BackendQueueProcessorFactory is responsible for returning a Runtime instance that, when executed, will push the Lucene change list out of Hibernate Search s responsibility (either by applying the changes or by delegating the changes to another instance).
Generating Barcode In Java
Using Barcode maker for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Generate QR In Java
Using Barcode creator for Java Control to generate, create QR Code 2d barcode image in Java applications.
www.OnBarcode.com
Indexing:when transparency is not enough
PDF 417 Drawer In Java
Using Barcode printer for Java Control to generate, create PDF417 image in Java applications.
www.OnBarcode.com
Generating GS1 - 13 In Java
Using Barcode generation for Java Control to generate, create EAN-13 image in Java applications.
www.OnBarcode.com
Defining the BackendQueueProcessorFactory implementation to use is one property away (see listing 5.18 for an example). Like the Worker implementations, all the properties prefixed with hibernate.search.worker are passed to the BackendQueueProcessorFactory at initialization time.
Draw Code 128 Code Set B In Java
Using Barcode encoder for Java Control to generate, create Code 128C image in Java applications.
www.OnBarcode.com
Uniform Symbology Specification ITF Drawer In Java
Using Barcode creation for Java Control to generate, create Interleaved 2 of 5 image in Java applications.
www.OnBarcode.com
Listing 5.18 Defining a BackendQueueProcessorFactory implementation
Encoding Data Matrix In Objective-C
Using Barcode drawer for iPhone Control to generate, create ECC200 image in iPhone applications.
www.OnBarcode.com
ECC200 Reader In Visual C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
org.hibernate.search.worker.backend my.custom.JGroupsBackendQueueProcessorFactory org.hibernate.search.worker.use_multicast true
Data Matrix ECC200 Maker In VS .NET
Using Barcode generator for Reporting Service Control to generate, create Data Matrix ECC200 image in Reporting Service applications.
www.OnBarcode.com
Barcode Creation In None
Using Barcode creation for Microsoft Excel Control to generate, create Barcode image in Excel applications.
www.OnBarcode.com
The fully qualified class name of the factory is defined in org.hibernate.search.worker.backend. This section is in no way comprehensive, but it should give you a good idea of Hibernate Search s flexibility and the pieces you can customize. Remember, these APIs are semipublic. Don t blame us if you need to tweak them a bit between two major Hibernate Search releases. You probably have noticed that this section is almost free of Java code. No, the authors have not become lazy. We warned you in the title of this section. Hibernate Search takes care of all the indexing bookkeeping for your applications. As soon as Hibernate Core makes a change, Hibernate Search propagates the change to Lucene transparently. But what can you do if you need to index your data manually What about the existing data set lying in the database Should you really wait for an update before Hibernate Search wakes up and indexes the data The next section will answer these questions.
Scanning Code 128 Code Set B In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Decode Code39 In C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Indexing:when transparency is not enough
Printing PDF 417 In Visual Studio .NET
Using Barcode maker for .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
UPC-A Printer In None
Using Barcode encoder for Software Control to generate, create UPC Symbol image in Software applications.
www.OnBarcode.com
While transparent indexing is easy and covers most cases, you ll find situations where your application wants Hibernate Search to explicitly index entities. Transparent indexing happens when Hibernate Core applies a change to an entity (add, update, or delete), but at times you ll want to index when no change happens. The initial indexing of an existing database is the most obvious and prominent use case, but it isn t the only one, as you ll see later in this section. Hibernate Search provides a way to directly ask for manual indexing as part of its core API.
Create UPC-A Supplement 2 In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create UCC - 12 image in Visual Studio .NET applications.
www.OnBarcode.com
Paint Barcode In Java
Using Barcode creation for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Manual indexing APIs
Code 128C Drawer In None
Using Barcode drawer for Font Control to generate, create Code128 image in Font applications.
www.OnBarcode.com
Decode Data Matrix In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
When Hibernate Search receives a change event from Hibernate Core, it triggers either the object indexing to the Lucene index or the object removal from the Lucene index. Those two primitive operations are available in the FullTextSession and FullTextEntityManager APIs:
index(Object entity) Index or reindex an entity managed by the session
without triggering any database change.
Indexing: where, how, what, and when
purge(Class entityType, Serializable id) Remove from the Lucene
index an entity with the given identifier without removing the entity from the database. purgeAll(Class entityType) Remove from the Lucene index all entities of a given type (and all its subclasses) without removing them from the database.
Listing 5.19 shows how to index all objects of a given type. Don t copy this example because it suffers a major flaw (see section 5.4.2 for more information). But it should be good enough if you re indexing a handful of objects.
Listing 5.19 Indexing all objects manually (the na ve approach)
tx = session.beginTransaction(); //read the data from the database Query query = session.createCriteria(Item.class); List<Object> items = query.list(); for (Object item : items) { session.index( item ); } tx.commit();
Copyright © OnBarcode.com . All rights reserved.