OneTimeExecutable (Apache Wayang (incubating) 0.7.1 API)

java.lang.Object
- org.apache.wayang.core.util.OneTimeExecutable

Direct Known Subclasses:

Job, LoopEnumerator, LoopIsolator, PushExecutorTemplate.StageExecution, StageAssignmentTraversal
```
public abstract class OneTimeExecutable
extends java.lang.Object
```
Method wrapper that ensures that it is called only once.

Constructor Summary

Constructors
Constructor Description

OneTimeExecutable()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract void`	`doExecute()`	Performs the actual work of this instance.
`protected void`	`execute()`	Invoke `doExecute()`.
`protected boolean`	`tryExecute()`	Invoke `doExecute()` unless it has been executed already.

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

- Constructor Detail
  - OneTimeExecutable
```
public OneTimeExecutable()
```
- Method Detail
  - tryExecute
```
protected boolean tryExecute()
```
    Invoke doExecute() unless it has been executed already. Also, ensure that it will not be invoked a second time.
    
    Returns:
    
    whether the method invocation resulted in invoking doExecute()
  - execute
```
protected void execute()
                throws java.lang.IllegalStateException
```
    Invoke doExecute(). Also, ensure that it will not be invoked a second time.
    
    Throws:
    
    java.lang.IllegalStateException - if doExecute() has been already invoked
  - doExecute
```
protected abstract void doExecute()
```
    Performs the actual work of this instance. Should only be invoked via execute() and tryExecute().