AsyncErrataCloneCounter

```
public class AsyncErrataCloneCounter
extends java.lang.Object
```
If someone attempts to schedule a synchronous errata clone into a channel that has asynchronous errata clones taking place in the background, a database deadlock will occur. There is no way to avoid the deadlock, so instead we'll keep track of how many pending jobs we have here. The jobs themselves are not persistent, residing in tomcat memory only, so the counter should not be persistent. That is why I implemented the counter as a singeton class instead of a database table or some other such implementation.

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addAsyncErrataCloneJob(java.lang.Long cid)` Call this with the channel id when scheduling a new asyncronous errata clone job
`boolean`	`channelHasPendingJobs(java.lang.Long cid)` Check if a channel has pending asyncrhonous errata clone jobs
`static AsyncErrataCloneCounter`	`getInstance()` Get the one and only instance of AsyncErrataCloneCounter
`void`	`removeAsyncErrataCloneJob(java.lang.Long cid)` Call this with channel id when completeing an asynchronous errata clone job

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

Class AsyncErrataCloneCounter