/**
* Delegate to the {@link RetryPolicy} having checked in the cache for an existing value if the
* state is not null.
*
* @param state a {@link RetryState}
* @param retryPolicy a {@link RetryPolicy} to delegate the context creation
* @return a retry context, either a new one or the one used last time the same state was
* encountered
*/
protected RetryContext open(RetryPolicy retryPolicy, RetryState state) {
if (state == null) {
return doOpenInternal(retryPolicy);
}
Object key = state.getKey();
if (state.isForceRefresh()) {
return doOpenInternal(retryPolicy, state);
}
// If there is no cache hit we can avoid the possible expense of the
// cache re-hydration.
if (!this.retryContextCache.containsKey(key)) {
// The cache is only used if there is a failure.
return doOpenInternal(retryPolicy, state);
}
RetryContext context = this.retryContextCache.get(key);
if (context == null) {
if (this.retryContextCache.containsKey(key)) {
throw new RetryException(
"Inconsistent state for failed item: no history found. "
+ "Consider whether equals() or hashCode() for the item might be inconsistent, "
+ "or if you need to supply a better ItemKeyGenerator");
}
// The cache could have been expired in between calls to
// containsKey(), so we have to live with this:
return doOpenInternal(retryPolicy, state);
}
// Start with a clean slate for state that others may be inspecting
context.removeAttribute(RetryContext.CLOSED);
context.removeAttribute(RetryContext.EXHAUSTED);
context.removeAttribute(RetryContext.RECOVERED);
return context;
}
