If the disableOnClick attribute is set to true the button will be automatically disabled when clicked, typically to prevent (accidental) extra clicks on a button. You can later return the button to the enabled state by invoking the setEnabled(true) method. Main screen is the root application screen displayed when the user is logged in. By default, the framework provides the main screen with a side menu. In order to extend the existing screen, use Login screen template in Studio screen creation wizard. As a result, Studio will create a screen extending the standard login screen.

If you implement the DataStore interface in your project, the name of the implementation bean must be specified in the cuba.storeImpl_ application property. DataService provides a facade for calling DataManager middleware implementation from the client tier. The usage of DataService interface in the application code is not recommended. Instead, use DataManager directly on both middle and client tiers. The proxy object factory is configured in spring.xml of the corresponding client block and contains service names and interfaces. ServiceInterceptor is called automatically for any service method using Spring AOP.

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Scripting interface is used to compile and load Java and Groovy classes dynamically (i.e. at runtime) as well as to execute Groovy scripts and expressions. Messages interface provides methods to get localized message strings. Please note that UiEvent instances are not sent to Spring beans.

Setup

MetadataTools is a Spring bean, containing additional methods for working with metadata. You can access MetadataTools interface by either using Metadata.getTools() method, or as any other bean – by means of injection or through AppBeans class. By default, Spring events require protected, package or public access modifiers for @EventListener methods. If you need to overcome restrictions of DataManager when working on the client tier, create your own service and use TransactionalDataManager or EntityManager to work with data. In the service, you can check permissions using the Security interface and return data to the client in the form of persistent or non-persistent entities or arbitrary values. When you work with data on the client tier, you have only one option – DataManager.

The @Valid annotation can be used if you need the cascaded validation of method parameters. In the example above, the constraints declared on the Task object will be validated as well. The session attributes are replicated in the Middleware cluster, same as the other user session data. Language selection options are determined by the combination of cuba.localeSelectVisible and cuba.availableLocales application properties.

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CUBA Studio automatically creates database migration scripts for your changing data model, see its documentation. The information below can be helpful for better understanding of the process and for creating Groovy-based migration scripts not supported in Studio. This section provides information on how to configure database connections and work with particular types of DBMS. It also describes a database migration mechanism, which enables creating a new database and keeping it up-to-date throughout the entire cycle of the development and operation of the application.

4.5. Transaction Management

Of course, application components can be reusable and provide a domain-specific layer of abstraction on top of the framework. A screen fragment can have its own data containers and loaders, defined in the data XML element. At the same time, the framework creates a single instance of DataContext for the screen and all its fragments.

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CUBA-style approach to solving these problems is to detach the value stored sell mobile proxies in the database from ordinal value of the enumeration. The framework enables splitting the application functionality into components. Each application component (AKA add-on) can have its own data model, business logic and user interface. The application uses the component as a library and includes its functionality. BulkEditor is a component that enables changing attribute values for several entity instances at once. The component is a button, usually added to a table or a tree, which opens the entity bulk editor on click.

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As soon as the balancer completes QUIC, our infrastructure explicitly sends this action over HTTP2/TCP to our data centers. Uber is a global scale, namely 600 cities of presence, in each of which the application fully relies on wireless Internet from more than 4500 mobile operators. Users expect the app to be not just fast, but real-time – to deliver this, the Uber app needs low latency and a very reliable connection. Alas, but the stack HTTP / 2 does not perform well in dynamic and lossy wireless networks.

The Framework

Sometimes it is needed to get a combined property value from all application components used in the project. This is especially true for configuration parameters that allow platform mechanisms to configure your application based on the parameters provided by components. DataManager in fact just delegates to a DataStore implementation and handles cross-database references if needed.

3.3. Database Migration Scripts

However, if the loaded entity is cached, this view attribute is ignored and the entity will still be loaded with all local attributes. Object-Relational Mapping is a technology for linking relational database tables to programming language objects. CUBA uses the ORM implementation based on the EclipseLink framework.

• You can force EntityManager to load partial entities if you set the loadPartialEntities attribute of the view to true (for example, DataManager does this).
• Basically, CurrencyField repeats the functionality of TextField.
• At the same time, the framework creates a single instance of DataContext for the screen and all its fragments.
• Therefore the code will be executed with the existing session and the subsequent call to the end() method will not clear the thread.
• Views mechanism resolves these issues by retrieving from the database and transmitting to the client entity graphs limited by depth and by attributes.
• The RTO is dynamically calculated based on various factors such as the expected RTT latency between sender and receiver.
• It also describes a database migration mechanism, which enables creating a new database and keeping it up-to-date throughout the entire cycle of the development and operation of the application.
• Component returns a hexadecimal (HEX) value of the color as a string.

For example, cuba.persistenceConfig should be an additive property. In your project, it specifies a persistence.xml file defining your project’s data model. AuthenticationManager login / authenticate methods return AuthenticationDetails instance which contains UserSession object.

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For this reason, instead of sending this chain to the client we send its representation inside a specially created RemoteException object. Password hashing algorithm is implemented by the EncryptionModule type bean and is specified in cuba.passwordEncryptionModule application property. See Anonymous Access & Social Login guide to learn how to set up public access to some screens of the application and implement custom login using a Google, Facebook, or GitHub account. In this case the messages in the second pack of the list will override those from the first pack. Thus, the messages defined in the application components packs can be overridden in the application project.

The method accepts a parameter indicating whether the transaction was successfully committed and a collection of detached entities contained in the persistence context of the completed transaction. The default timeout can be defined using the cuba.defaultQueryTimeoutSec application property. A listener is a class implementing one or several interfaces from the com.haulmont.cuba.core.listener package. The listener will react to events corresponding to the implemented interfaces. CUBA Studio automatically maintains the set of attributes for cross-datastore references when you select an entity from a different data store as an association.

4. Middleware Components

When integration is implemented, Studio allows developer to use standard dialogs when changing data store settings. Also (the most important) Studio will be able to automatically generate database migration scripts for entities defined in the platform, add-ons and the project. Integration instructions are available in the corresponding section of the Studio User Guide. If you want to check entity operation permissions when using DataManager in your middleware code, obtain a wrapper via DataManager.secure() method and call its methods.

• An object of this interface can be obtained through the Persistence.getDbTypeConverter() method.
• In order to do it, you should specify the groups attribute on the constraint annotation.
• For OS environment variables, the framework tries to find the exact match of property name, and if not found, it looks for a name converted to upper case and with dots replaced with underscores.
• Besides, if an attribute does not have write access method (setter), it becomes immutable (read-only).
• The action attribute contains the name of action corresponding to the button.
• Explicitly defines the name of a database sequence that should be used for generating identifiers if the entity is a subclass of BaseLongIdEntity or BaseIntegerIdEntity.
• Such high latency at the TCP layer caused HTTPS timeouts and retry requests, further increasing network latency and inefficiency.
• The web applications contain the JAR files located in the WEB-INF/lib directories.

Finally, we evaluated several UDP-based protocols that troubleshoot video streaming – we wanted to see if these protocols would help in our case. Alas, they were severely lacking in many security settings, and they also required an additional TCP connection for metadata and control information. Finally, cellular network performance varies by carrier, region, and time. In Figure 2, we have collected the median delays of HTTPS traffic across cells over a range of 2 kilometers. The data is collected for the two largest mobile operators in Delhi, India. Also, the performance of one operator differs from the performance of the second one.

To enable the use of BulkEditor, the table or tree must have the multiselect attribute set to “true”. If Action properties are changed after the Action has been set for a Button, then Button properties also change accordingly, i.e. the button listens to the changes in Action properties. In this case, the caption, description and icon properties will change even if they had been initially assigned to the button itself. The button’s caption is set using the caption attribute, the tooltip – using the description attribute. In this section, we explain how to define and use screen fragments.

You will also be able to select a data store when using the Generate Model wizard for creation of new entities mapped to an existing database schema. The update scripts for the main data store are located in the /db/update directory of the core module. Update scripts for additional data stores (if any) must be located in /db/update_ directory. You can display entities from different data stores on a single UI screen, and DataManager will ensure they will be dispatched to appropriate data stores on save. Depending on the entity type, DataManager selects a registered data store represented by an implementation of the DataStore interface and delegates loading and saving entities to it. When you control transactions in your code and work with entities via EntityManager, you have to specify explicitly what data store to use.

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The reference to ViewRepository can be obtained using injection or through the AppBeans static methods. Use ViewRepository.getView() methods to retrieve view instances from the repository. Typically, this annotation is set on the field of a base class, such as BaseUuidEntity. Using this annotation for a specific entity class is required only in case of inheritance from the BaseStringIdEntity base class (i.e. creating an entity with a string primary key). Base entity classes (see below) override equals() and hashCode() methods to check entity instances equivalence by comparing their identifiers. I.e., instances of the same class are considered equal if their identifiers are equal.

Allows you to use a fully qualified enum constant name instead of its database identifier. This simplifies searching for enum usages throughout the application code. If you pass the string (?i)%doe% as a value of the name parameter, the search will return John Doe, if such record exists in the database, even though the case of symbols is different. This will happen because ORM will run the SQL query with the condition lower(C.NAME) like ?. Any changes of the instance in Managed state will be saved to the database when the transaction that the EntityManager belongs to is committed. Reference to EntityManager may be obtained via the Persistence interface by calling its getEntityManager() method.

• Also, UnsupportedCredentialsException is thrown if passed credentials object cannot be processed by available AuthenticationProvider beans.
• As you can see, when values are returned through a custom CloseAction, the caller doesn’t have to know the opened screen class because it doesn’t invoke methods of the concrete screen controller.
• Managed beans are Spring beans that contain the business logic of the application.
• A screen fragment can have its own data containers and loaders, defined in the data XML element.
• Use the value attribute to specify values and the ref attribute to specify identifiers of the screen components.
• The orphanRemoval annotation attribute does not respect the soft deletion mechanism.
• Finally, we evaluated several UDP-based protocols that troubleshoot video streaming – we wanted to see if these protocols would help in our case.

An interface for obtaining the information on persistent entities managed by ORM. Unlike the Persistence and PersistenceTools beans, this interface is available on all tiers. By default, DataManager checks permissions on entity operations (READ/CREATE/UPDATE/DELETE) when invoked from a client, and ignores them when invoked from a middleware code. TransactionalDataManager is especially useful when handling EntityChangedEvent in the current transaction. It allows you to get the current state of the changed entity from the database before the transaction is committed.

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You can manually set a datatype for the field, except that only numeric datatypes inheriting NumericDatatype class are supported. CurrencyField is a subtype of a text field designed for currency value input. CurrencyField is used by default in screens generated by Studio for the attributes annotated with @CurrencyValue annotation.