RequestCoordinator

```
public interface RequestCoordinator

                    
```
An interface for coordinating multiple requests with the same .
To avoid deadlock, implemenations must not call into individual Requests to determine their state (ie do not call isCleared or isRunning etc). Instead use RequestState and the various methods available on this interface and Request to track states manually.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`public enum`	`RequestCoordinator.RequestState`	A simple state enum to keep track of the states of individual subrequests.

Method Summary

Modifier and Type	Method	Description
`abstract boolean`	`canSetImage(Request request)`	Returns true if the Request can display a loaded bitmap.
`abstract boolean`	`canNotifyStatusChanged(Request request)`	Returns true if the Request can display a placeholder.
`abstract boolean`	`canNotifyCleared(Request request)`	Returns `{@code true}` if the Request can clear the .
`abstract boolean`	`isAnyResourceSet()`	Returns true if any coordinated Request has successfully completed.
`abstract void`	`onRequestSuccess(Request request)`	Must be called when a Request coordinated by this object completes successfully.
`abstract void`	`onRequestFailed(Request request)`	Must be called when a Request coordinated by this object fails.
`abstract RequestCoordinator`	`getRoot()`	Returns the top most parent `{@code RequestCoordinator}`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - canSetImage
```
 abstract boolean canSetImage(Request request)
```
    Returns true if the Request can display a loaded bitmap.
    
    Parameters:
    
    request - The Request requesting permission to display a bitmap.
  - canNotifyStatusChanged
```
 abstract boolean canNotifyStatusChanged(Request request)
```
    Returns true if the Request can display a placeholder.
    
    Parameters:
    
    request - The Request requesting permission to display a placeholder.
  - canNotifyCleared
```
 abstract boolean canNotifyCleared(Request request)
```
    Returns {@code true} if the Request can clear the .
  - isAnyResourceSet
```
 abstract boolean isAnyResourceSet()
```
    Returns true if any coordinated Request has successfully completed.
  - onRequestSuccess
```
 abstract void onRequestSuccess(Request request)
```
    Must be called when a Request coordinated by this object completes successfully.
  - onRequestFailed
```
 abstract void onRequestFailed(Request request)
```
    Must be called when a Request coordinated by this object fails.
  - getRoot
```
 abstract RequestCoordinator getRoot()
```
    Returns the top most parent {@code RequestCoordinator}.