com.google.gwt.core.client.testing

## Class StubScheduler

- java.lang.Object
- - com.google.gwt.core.client.Scheduler
  - - com.google.gwt.core.client.testing.StubScheduler

    public class StubScheduler
    extends Scheduler

A fake scheduler that records scheduled commands and can execute them when asked to.

Typical usage:

       scheduleCommands(scheduler);
       assertFalse(scheduler.executeCommands());

### Nested Class Summary

### Nested classes/interfaces inherited from class com.google.gwt.core.client.Scheduler

`Scheduler.RepeatingCommand, Scheduler.ScheduledCommand`

### Constructor Summary

Constructors
Constructor and Description
`StubScheduler()`

### Method Summary

All Methods Instance Methods Concrete Methods
`boolean` `executeCommands()` Executes all scheduled commands once.
`boolean` `executeRepeatingCommands()` Executes all scheduled `RepeatingCommand`s once.
`boolean` `executeScheduledCommands()` Executes all scheduled `ScheduledCommand`s that have been passed to this scheduler, then removes all commands.
`java.util.List<Scheduler.RepeatingCommand>` `getRepeatingCommands()` Returns the currently scheduled `RepeatingCommand`s that would be executed by `executeRepeatingCommands()`.
`java.util.List<Scheduler.ScheduledCommand>` `getScheduledCommands()` Returns the currently scheduled `ScheduledCommand`s that would be executed by `executeScheduledCommands()`.
`void` `scheduleDeferred(Scheduler.ScheduledCommand cmd)` A deferred command is executed after the browser event loop returns.
`void` `scheduleEntry(Scheduler.RepeatingCommand cmd)` An "entry" command will be executed before GWT-generated code is invoked by the browser's event loop.
`void` `scheduleEntry(Scheduler.ScheduledCommand cmd)` An "entry" command will be executed before GWT-generated code is invoked by the browser's event loop.
`void` `scheduleFinally(Scheduler.RepeatingCommand cmd)` A "finally" command will be executed before GWT-generated code returns control to the browser's event loop.
`void` `scheduleFinally(Scheduler.ScheduledCommand cmd)` A "finally" command will be executed before GWT-generated code returns control to the browser's event loop.
`void` `scheduleFixedDelay(Scheduler.RepeatingCommand cmd, int delayMs)` Schedules a repeating command that is scheduled with a constant delay.
`void` `scheduleFixedPeriod(Scheduler.RepeatingCommand cmd, int delayMs)` Schedules a repeating command that is scheduled with a constant periodicity.
`void` `scheduleIncremental(Scheduler.RepeatingCommand cmd)` Schedules a repeating command that performs incremental work.

### Methods inherited from class com.google.gwt.core.client.Scheduler

`get`

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Constructor Detail

#### StubScheduler

    public StubScheduler()

### Method Detail

#### getRepeatingCommands

    public java.util.List<Scheduler.RepeatingCommand> getRepeatingCommands()

Returns the currently scheduled `RepeatingCommand`s that would be executed by `executeRepeatingCommands()`.

#### executeCommands

    public boolean executeCommands()

Executes all scheduled commands once. Equivalent to calling `executeRepeatingCommands()` then `executeScheduledCommands()`.

Caveat: executes once any scheduled command created when executing the repeating commands.

Returns:
  whether some repeating commands are still scheduled (returned `true`) or new commands have been scheduled after the execution

#### executeRepeatingCommands

    public boolean executeRepeatingCommands()

Executes all scheduled `RepeatingCommand`s once. Does not execute the commands newly scheduled by the initial commands. Removes the commands that returned `false`.

After this method completes, `getRepeatingCommands()` returns only the commands that are still scheduled.

Returns:
  whether some commands are still scheduled (returned `true`) or new commands have been scheduled after the execution

#### getScheduledCommands

    public java.util.List<Scheduler.ScheduledCommand> getScheduledCommands()

Returns the currently scheduled `ScheduledCommand`s that would be executed by `executeScheduledCommands()`.

#### executeScheduledCommands

    public boolean executeScheduledCommands()

Executes all scheduled `ScheduledCommand`s that have been passed to this scheduler, then removes all commands.

After this method completes, `getScheduledCommands()` returns only the commands that have been scheduled by the initial commands.

Returns:
  whether new commands have been scheduled after the execution

#### scheduleDeferred

    public void scheduleDeferred(Scheduler.ScheduledCommand cmd)

Description copied from class: `Scheduler`
A deferred command is executed after the browser event loop returns.

Specified by:
  `scheduleDeferred` in class `Scheduler`

#### scheduleEntry

    public void scheduleEntry(Scheduler.RepeatingCommand cmd)

Description copied from class: `Scheduler`
An "entry" command will be executed before GWT-generated code is invoked by the browser's event loop. The `Scheduler.RepeatingCommand` will be called once per entry from the event loop until `false` is returned. This type of command is appropriate for instrumentation or code that needs to know when "something happens."

If an entry command schedules another entry command, the second command will be executed before control flow continues to the GWT-generated code.

Specified by:
  `scheduleEntry` in class `Scheduler`

#### scheduleEntry

    public void scheduleEntry(Scheduler.ScheduledCommand cmd)

Description copied from class: `Scheduler`
An "entry" command will be executed before GWT-generated code is invoked by the browser's event loop. This type of command is appropriate for code that needs to know when "something happens."

If an entry command schedules another entry command, the second command will be executed before control flow continues to the GWT-generated code.

Specified by:
  `scheduleEntry` in class `Scheduler`

#### scheduleFinally

    public void scheduleFinally(Scheduler.RepeatingCommand cmd)

Description copied from class: `Scheduler`
A "finally" command will be executed before GWT-generated code returns control to the browser's event loop. The `Scheduler.RepeatingCommand.execute()` method will be called once per exit to the event loop until `false` is returned. This type of command is appropriate for instrumentation or cleanup code.

If a finally command schedules another finally command, the second command will be executed before control flow returns to the browser.

Specified by:
  `scheduleFinally` in class `Scheduler`

#### scheduleFinally

    public void scheduleFinally(Scheduler.ScheduledCommand cmd)

Description copied from class: `Scheduler`
A "finally" command will be executed before GWT-generated code returns control to the browser's event loop. This type of command is used to aggregate small amounts of work before performing a non-recurring, heavyweight operation.

If a finally command schedules another finally command, the second command will be executed before control flow returns to the browser.

Consider the following:

     try {
       nativeEventCallback(); // Calls scheduleFinally one or more times
     } finally {
       executeFinallyCommands();
     }

Specified by:
  `scheduleFinally` in class `Scheduler`
See Also:
  `StyleInjector`

#### scheduleFixedDelay

    public void scheduleFixedDelay(Scheduler.RepeatingCommand cmd,
                                   int delayMs)

Description copied from class: `Scheduler`
Schedules a repeating command that is scheduled with a constant delay. That is, the next invocation of the command will be scheduled for `delayMs` milliseconds after the last invocation completes.

For example, assume that a command takes 30ms to run and a 100ms delay is provided. The second invocation of the command will occur at 130ms after the first invocation starts.

Specified by:
  `scheduleFixedDelay` in class `Scheduler`
Parameters:
  `cmd` - the command to execute
  `delayMs` - the amount of time to wait after one invocation ends before the next invocation

#### scheduleFixedPeriod

    public void scheduleFixedPeriod(Scheduler.RepeatingCommand cmd,
                                    int delayMs)

Description copied from class: `Scheduler`
Schedules a repeating command that is scheduled with a constant periodicity. That is, the command will be invoked every `delayMs` milliseconds, regardless of how long the previous invocation took to complete.

Specified by:
  `scheduleFixedPeriod` in class `Scheduler`
Parameters:
  `cmd` - the command to execute
  `delayMs` - the period with which the command is executed

#### scheduleIncremental

    public void scheduleIncremental(Scheduler.RepeatingCommand cmd)

Description copied from class: `Scheduler`
Schedules a repeating command that performs incremental work. This type of command is encouraged for long-running processes that perform computation or that manipulate the DOM. The commands in this queue are invoked many times in rapid succession and are then deferred to allow the browser to process its event queue.

Specified by:
  `scheduleIncremental` in class `Scheduler`
Parameters:
  `cmd` - the command to execute