protected abstract static class AbstractObjectCache.SoftKey<T>
extends com.google.common.base.FinalizableSoftReference<T>
It acts as a proxy for the object it refers to and essentially delegates to it. There are three exceptions here:
1) This key needs to have a cached hash code. The requirement is that the key needs to be able to look itself up after the reference to the object has been cleared (and thus we can no longer look it up from there). One typical container where we are stored are HashMaps -- and they need it to be constant. 2) This key does not tolerate checks to see if its equal to null. While we could return false, we want to catch offenders who try to store nulls in the cache. 3) This key inverts the check for equality, e.g. it calls equals() on the object which was passed to its equals(). Instead of supplying itself, it supplies the referent. If the soft reference is cleared, such check will return false, which is fine as it prevents normal lookup from seeing the cleared key. Removal is handled by the explicit identity check.
| Constructor and Description |
|---|
SoftKey(T referent,
com.google.common.base.FinalizableReferenceQueue queue) |
| Modifier and Type | Method and Description |
|---|---|
boolean |
equals(Object obj) |
int |
hashCode() |
getclear, enqueue, isEnqueuedCopyright © 2018 OpenDaylight. All rights reserved.