Offheap cache clearing is broken

[ocafebabe]

Trying to clear an offheap cache results in an illegal state exception:

Cache<Integer, Integer> cache =
    CacheBuilder.offHeapCache().storage(new OffHeapByteBufferStore(8388608, 10)).build();
for (int i=0; i<5; i++) {
    cache.put(i, i);
}
cache.clear();

And as soon as clear is called I get:

java.lang.IllegalStateException: Queue full
    at java.util.AbstractQueue.add(AbstractQueue.java:98)
    at com.cetsoft.imcache.offheap.bytebuffer.OffHeapByteBufferStore.free(OffHeapByteBufferStore.java:225)
    at com.cetsoft.imcache.offheap.bytebuffer.OffHeapByteBufferStore.free(OffHeapByteBufferStore.java:214)
    at com.cetsoft.imcache.offheap.OffHeapCache.clear(OffHeapCache.java:254)

[yusufaytas]

First of all, thanks a lot reporting this bug. Here's the story. This is a bug related to available buffers. Whenever free them, we were trying to add freed buffer index to bounded queue which is already in the bounded queue. So, we check buffer index and we clear it if available buffer don't contain index.

[yusufaytas]

We've fixed the bug with following commit. Closing the issue.
9919144