com.google.web.bindery.requestfactory.shared

Interface RequestContext

All Known Subinterfaces:

FindRequest, LoggingRequest

All Known Implementing Classes:

AbstractRequestContext, FakeRequestContext

public interface RequestContext

The base interface for RequestFactory service endpoints. Implementations of this interface are provided by the RequestFactory plumbing and this interface may be extended in the future.

See Also:

FakeRequestContext

Method Summary

Modifier and Type	Method and Description
<T extends RequestContext> T	append(T other) Joins another RequestContext to this RequestContext.
<T extends BaseProxy> T	create(Class<T> clazz) Returns a new mutable proxy that this request can carry to the server, perhaps to be persisted.
<T extends BaseProxy> T	edit(T object) Returns a mutable version of the proxy, whose mutations will accumulate in this context.
<P extends EntityProxy> Request<P>	find(EntityProxyId<P> proxyId) Return a request to find a fresh instance of the referenced proxy.
void	fire() Send the accumulated changes and method invocations associated with the RequestContext.
void	fire(Receiver<Void> receiver) For receiving errors or validation failures only.
RequestFactory	getRequestFactory() Returns the RequestFactory that created the RequestContext.
boolean	isChanged() Returns true if any changes have been made to proxies mutable under this context.

Method Detail

append

<T extends RequestContext> T append(T other)

Joins another RequestContext to this RequestContext.

 SomeContext ctx = myFactory.someContext();
 // Perform operations on ctx
 OtherContext other = ctx.append(myFactory.otherContext());
 // Perform operations on both other and ctx
 ctx.fire() // or other.fire() are equivalent 
 

Parameters:

other - a freshly-constructed RequestContext whose state should be bound to this RequestContext

Returns:

other

Throws:

IllegalStateException - if any methods have been called on other or if other was constructed by a different RequestFactory instance

create

<T extends BaseProxy> T create(Class<T> clazz)

Returns a new mutable proxy that this request can carry to the server, perhaps to be persisted. If the object is successfully persisted, a PERSIST event will be posted including the EntityProxyId of this proxy.

Parameters:

clazz - a Class object of type T

Returns:

an BaseProxy instance of type T

edit

<T extends BaseProxy> T edit(T object)

Returns a mutable version of the proxy, whose mutations will accumulate in this context. Proxies reached via getters on this mutable proxy will also be mutable.

Parameters:

object - an instance of type T

Returns:

an EntityProxy or ValueProxy instance of type T

find

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

Return a request to find a fresh instance of the referenced proxy.

Parameters:

proxyId - an EntityProxyId instance of type P

Returns:

a Request object

fire

void fire()

Send the accumulated changes and method invocations associated with the RequestContext.

If Request.to(Receiver) has not been called, this method will install a default receiver that will throw a RuntimeException if there is a server failure.

fire

void fire(Receiver<Void> receiver)

For receiving errors or validation failures only.

Parameters:

receiver - a Receiver instance

Throws:

IllegalArgumentException - if receiver is null

getRequestFactory

RequestFactory getRequestFactory()

Returns the RequestFactory that created the RequestContext.

isChanged

boolean isChanged()

Returns true if any changes have been made to proxies mutable under this context. Note that vacuous changes — e.g. foo.setName(foo.getName() — will not trip the changed flag. Similarly, "unmaking" a change will clear the isChanged flag

 String name = bar.getName();
 bar.setName("something else");
 assertTrue(context.isChanged());
 bar.setName(name);
 assertFalse(context.isChanged());
 

Returns:

true if any changes have been made