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As the examples have shown, you can use any of these properties independent from the others. But let s wrap it all up by trying an example that includes all of them. For this example, I want the map type control to be displayed in the upper part of the map and be in the form of a drop-down list with only the Map and Satellite map types to choose from (see Listing 4-7 and Figure 4-8). Listing 4-7. Using All the Properties of mapTypeControlOptions var options = { zoom: 3, center: new google.maps.LatLng(37.09, -95.71), mapTypeId: google.maps.MapTypeId.ROADMAP, mapTypeControl: true, mapTypeControlOptions: { style: google.maps.MapTypeControlStyle.DROPDOWN_MENU, position: google.maps.ControlPosition.TOP, mapTypeIds: [ google.maps.MapTypeId.ROADMAP, google.maps.MapTypeId.SATELLITE ] } };

Another mode that targets the case of acquiring pessimistic locks, even though the entity is only being read, is the PESSIMISTIC_FORCE_INCREMENT mode. Like the OPTIMISTIC_FORCE_INCREMENT, this mode will also increment the version field of the locked entity regardless of whether changes were made to it. It is a somewhat overlapping case with pessimistic read locking and optimistic write locking, for example, when non-owned collection-valued relationships are present in the entity and have been modified. Forcing the version field to be incremented can maintain a certain degree of version consistency across relationships.

Designs the menu bar itself. Designs the left command (Options, Select, and user-defined commands). Accepts all attributes of the IconItem. Designs the right command (Cancel and user-defined Command.BACK or CANCEL commands). Accepts all attributes of the IconItem.

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The Versioning section mentioned that changes to any owned relationships would cause the version field of the owning entity to be updated. If a unidirectional one-to-many relationship were to change, for example, the version would be updated even though no changes to the entity table would otherwise have been asserted. When it comes to pessimistic locking, acquiring exclusive locks on entities in other entity tables can increase the likelihood of deadlock occurring. To avoid this, the default behavior of pessimistically locking queries is to not acquire locks on tables that are not mapped to the entity. An extra property exists to enable this behavior in case someone needs to acquire the locks as part of a pessimistic query. The javax.persistence.lock.scope property can be set on the query as a property, with its value set to PessimisticLockScope.EXTENDED. When set, target tables of unidirectional relationships, element collection tables, and owned many-to-many relationship join tables will all have their corresponding rows pessimistically locked. This property should normally be avoided, except when it is absolutely necessary to lock such tables as join tables that cannot be conveniently locked any other way. Strict ordering and a solid understanding of the mappings and operation ordering should be a prerequisite to enabling this property to ensure that deadlocks do not result.

Figure 4-8. Using all the properties of mapTypeControlOptions, you get a mapTypeControl that is positioned at the top as a drop-down list with only two available choices.

Until now we have made no mention of timeouts or how to specify how long to wait for locks. Although JPA does not normatively describe how providers must support timeout modes for pessimistic lock acquisition, JPA does define a hint that providers can use. Though not mandatory, the javax.persistence.lock.timeout hint is likely supported by the major JPA providers, however, make sure that your provider supports it before coding to this hint. Its value can be either 0 , meaning do not block waiting for the lock, or some integer describing the number of milliseconds to wait for the lock. It

Defines the image s URL for the Options image of the extended menu bar. Defines the image s URL for the Select image of the extended menu bar. Defines the image s URL for the Cancel image of the extended menu bar. Determines whether the text should be shown as well in the menu bar when an image has been defined for the corresponding action. Defaults to false.

can be passed into any of the EntityManager API methods that accept both a lock mode and a Map of properties or hints: Map<String,Object> props = new HashMap<String,Object>(); props.put("javax.persistence.lock.timeout",5000); em.find(Employee.class, 42, LockModeType.PESSIMISTIC_WRITE, props); It can also be set on a query as a hint: TypedQuery<Employee> q = em.createQuery( "SELECT e FROM EMPLOYEE e WHERE e.id = 42", Employee.class); q.setLockMode(LockModeType.PESSIMISTIC_WRITE); q.setHint("javax.persistence.lock.timeout",5000); Unfortunately there is no default behavior when the timeout hint is not specified. Between the provider and the database it may be blocking, it may be no wait , or it may have a default timeout.

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