Package com.google.web.bindery.requestfactory.shared

Interface RequestFactory

All Known Implementing Classes:

com.google.web.bindery.requestfactory.shared.impl.AbstractRequestFactory, FakeRequestFactory, InProcessRequestFactory

public interface RequestFactory

Marker interface for the RequestFactory code generator.

Limitations on the transferrability of types.
RequestFactory currently supports the transfer of basic value types, entity types, and collections, with limitations. The basic value types supported are String, Enum, Boolean, Character, subtypes of Number, and Date. Any value type not included in this list may not be declared in the type signature of a service method, or EntityProxy. Collection types supported are List and Set with the restriction that a collection must be homogeneous and only hold one type of value.

Polymorphism is not supported at this time. RequestFactory encoding and decoding requires exact knowledge of the concrete type. If a method declares a given type T as a parameter or return type, only T's transferrable properties will be sent over the wire if it is a proxy, even if the underlying domain value contains extra fields, in effect, treating it as an instance of the supertype. Returning abstract supertypes of value types is not supported (e.g. Object, Enum, Number).

See Also:

• FakeRequestFactory
• InProcessRequestTransport

Field Summary

Fields

Modifier and Type	Field	Description
static final String	JSON_CONTENT_TYPE_UTF8	The JSON content type String.

Method Summary

Modifier and Type	Method	Description
<P extends EntityProxy> Request<P>	find(EntityProxyId<P> proxyId)	Return a request to find a fresh instance of the referenced proxy.
EventBus	getEventBus()	Returns the event bus this factory's events are posted on, which was set via initialize(com.google.web.bindery.event.shared.EventBus).
String	getHistoryToken(EntityProxyId<?> proxy)	Get a History compatible token that represents the given proxy class.
String	getHistoryToken(Class<? extends EntityProxy> clazz)	Get a History compatible token that represents the given class.
Class<? extends EntityProxy>	getProxyClass(String historyToken)	Return the class object which may be used to create new instances of the type of this token, via RequestContext.create(java.lang.Class<T>).
<T extends EntityProxy> EntityProxyId<T>	getProxyId(String historyToken)	Return the appropriate EntityProxyId using a string returned from getHistoryToken(EntityProxyId).
RequestTransport	getRequestTransport()	Returns the RequestTransport set via initialize(com.google.web.bindery.event.shared.EventBus).
ProxySerializer	getSerializer(ProxyStore store)	Returns a ProxySerializer that can encode and decode the various EntityProxy and ValueProxy types reachable from the RequestFactory.
void	initialize(EventBus eventBus)	Start this request factory with a DefaultRequestTransport .
void	initialize(EventBus eventBus, RequestTransport transport)	Start this request factory with a user-provided transport.

Field Details

JSON_CONTENT_TYPE_UTF8

static final String JSON_CONTENT_TYPE_UTF8

The JSON content type String.

See Also:

• Constant Field Values

Method Details

find

<P extends EntityProxy> Request<P> find(EntityProxyId<P> proxyId)

Return a request to find a fresh instance of the referenced proxy. If it is necessary to load several proxy instances, use RequestContext.find(EntityProxyId), which supports chained requests.

Parameters:

proxyId - an EntityProxyId instance of type P

Returns:

a Request object

See Also:

• RequestContext.find(EntityProxyId)

getEventBus

EventBus getEventBus()

Returns the event bus this factory's events are posted on, which was set via initialize(com.google.web.bindery.event.shared.EventBus).

Returns:

the EventBus associated with this instance

getHistoryToken

String getHistoryToken(Class<? extends EntityProxy> clazz)

Get a History compatible token that represents the given class. It can be processed by getProxyClass(String)

Parameters:

clazz - a Class object for an EntityProxy subclass

Returns:

a History compatible token

getHistoryToken

String getHistoryToken(EntityProxyId<?> proxy)

Get a History compatible token that represents the given proxy class. It can be processed by getProxyClass(String).

The history token returned for an EntityProxyId associated with a newly-created (future) EntityProxy will differ from the token returned by this method after the EntityProxy has been persisted. Once an EntityProxy has been persisted, the return value for this method will always be stable, regardless of when the EntityProxyId was retrieved relative to the persist operation. In other words, the "future" history token returned for an as-yet-unpersisted EntityProxy is only valid for the duration of the RequestFactory's lifespan.

Parameters:

proxy - an EntityProxyId instance

Returns:

a History compatible token

getProxyClass

Class<? extends EntityProxy> getProxyClass(String historyToken)

Return the class object which may be used to create new instances of the type of this token, via RequestContext.create(java.lang.Class<T>). The token may represent either a proxy instance (see getHistoryToken(java.lang.Class<? extends com.google.web.bindery.requestfactory.shared.EntityProxy>)) or a proxy class (see getProxyClass(java.lang.String)).

Parameters:

historyToken - a String token

Returns:

a Class object for an EntityProxy subclass

getProxyId

<T extends EntityProxy> EntityProxyId<T> getProxyId(String historyToken)

Return the appropriate EntityProxyId using a string returned from getHistoryToken(EntityProxyId).

Parameters:

historyToken - a String token

Returns:

an EntityProxyId

getRequestTransport

RequestTransport getRequestTransport()

Returns the RequestTransport set via initialize(com.google.web.bindery.event.shared.EventBus).

Returns:

the RequestTransport associated with this instance

getSerializer

ProxySerializer getSerializer(ProxyStore store)

Returns a ProxySerializer that can encode and decode the various EntityProxy and ValueProxy types reachable from the RequestFactory.

Parameters:

store - a helper object for the ProxySerializer to provide low-level storage access

Returns:

a new ProxySerializer

See Also:

• DefaultProxyStore

initialize

void initialize(EventBus eventBus)

Start this request factory with a DefaultRequestTransport .

Parameters:

eventBus - an EventBus

initialize

void initialize(EventBus eventBus,
 RequestTransport transport)

Start this request factory with a user-provided transport.

Parameters:

eventBus - an EventBus

transport - a RequestTransport instance