/**
* Gets a reference to the {@link org.terracotta.statistics.OperationStatistic} instance holding
* the class of statistics specified for the {@code Ehcache} instance provided.
*
* @param ehcache the {@code Ehcache} instance for which the {@code OperationStatistic} instance
* should be obtained
* @param statsClass the {@code Class} of statistics for which the {@code OperationStatistic}
* instance should be obtained
* @param <E> the {@code Enum} type for the statistics
* @return a reference to the {@code OperationStatistic} instance holding the {@code statsClass}
* statistics; may be {@code null} if {@code statsClass} statistics do not exist for {@code
* ehcache}
*/
private static <E extends Enum<E>> OperationStatistic<E> getOperationStatistic(
final Ehcache<?, ?> ehcache, final Class<E> statsClass) {
for (final TreeNode statNode : ContextManager.nodeFor(ehcache).getChildren()) {
final Object statObj = statNode.getContext().attributes().get("this");
if (statObj instanceof OperationStatistic<?>) {
@SuppressWarnings("unchecked")
final OperationStatistic<E> statistic = (OperationStatistic<E>) statObj;
if (statistic.type().equals(statsClass)) {
return statistic;
}
}
}
return null;
}
<T extends Enum<T>> OperationStatistic<T> findLowestTierStatistic(
Cache<?, ?> cache, Class<T> type, String statName) {
Query statQuery =
queryBuilder()
.descendants()
.filter(
context(
attributes(
Matchers.<Map<String, Object>>allOf(
hasAttribute("name", statName), hasAttribute("type", type)))))
.build();
Set<TreeNode> statResult =
statQuery.execute(Collections.singleton(ContextManager.nodeFor(cache)));
if (statResult.size() < 1) {
throw new RuntimeException(
"Failed to find lowest tier statistic: "
+ statName
+ " , valid result Set sizes must 1 or more. Found result Set size of: "
+ statResult.size());
}
// if only 1 store then you don't need to find the lowest tier
if (statResult.size() == 1) {
return (OperationStatistic)
statResult.iterator().next().getContext().attributes().get("this");
}
String lowestStoreType = "onheap";
TreeNode lowestTierNode = null;
for (TreeNode treeNode : statResult) {
if (((Set) treeNode.getContext().attributes().get("tags")).size() != 1) {
throw new RuntimeException(
"Failed to find lowest tier statistic. \"tags\" set must be size 1");
}
String storeType = treeNode.getContext().attributes().get("tags").toString();
if (storeType.compareToIgnoreCase(lowestStoreType) < 0) {
lowestStoreType = treeNode.getContext().attributes().get("tags").toString();
lowestTierNode = treeNode;
}
}
return (OperationStatistic) lowestTierNode.getContext().attributes().get("this");
}
static <T extends Enum<T>> OperationStatistic<T> findCacheStatistic(
Cache<?, ?> cache, Class<T> type, String statName) {
Query query =
queryBuilder()
.children()
.filter(
context(
attributes(
Matchers.<Map<String, Object>>allOf(
hasAttribute("name", statName), hasAttribute("type", type)))))
.build();
Set<TreeNode> result = query.execute(Collections.singleton(ContextManager.nodeFor(cache)));
if (result.size() > 1) {
throw new RuntimeException("result must be unique");
}
if (result.isEmpty()) {
throw new RuntimeException("result must not be null");
}
return (OperationStatistic<T>) result.iterator().next().getContext().attributes().get("this");
}