@Test
/**
* PS: Test will fail if for some reason we cannot do 50 ops/sec against a hash map. So yeah,
* pretty unlikely.
*/
public void testQuotaPctUsageCalculation() throws Exception {
File tempDir = TestUtils.createTempDir();
FileBackedCachingStorageEngine quotaStore =
new FileBackedCachingStorageEngine("quota-usage-test-store", tempDir.getAbsolutePath());
InMemoryStorageEngine<ByteArray, byte[], byte[]> inMemoryEngine =
new InMemoryStorageEngine<ByteArray, byte[], byte[]>("inMemoryBackingStore");
QuotaLimitStats quotaStats = new QuotaLimitStats(null, 1000);
StatTrackingStore statTrackingStore = new StatTrackingStore(inMemoryEngine, null);
QuotaLimitingStore quotaLimitingStore =
new QuotaLimitingStore(
statTrackingStore, statTrackingStore.getStats(), quotaStats, quotaStore);
int targetRate = 50;
// provide a quota of 100 gets/sec
quotaStore.put(
new ByteArray(
QuotaUtils.makeQuotaKey(statTrackingStore.getName(), QuotaType.GET_THROUGHPUT)
.getBytes()),
new Versioned<byte[]>("100.0".getBytes()),
null);
long testIntervalMs = 5000;
long timeToSleepMs = 1000 / targetRate;
long startMs = System.currentTimeMillis();
ByteArray key = new ByteArray("some key".getBytes());
while ((System.currentTimeMillis() - startMs) <= testIntervalMs) {
quotaLimitingStore.get(key, null);
Thread.sleep(timeToSleepMs);
}
assertEquals("No get operations should be throttled", 0, quotaStats.getRateLimitedGets());
assertEquals("Put usage should be 0", 0, quotaStats.getQuotaPctUsedPut());
assertEquals("delete usage should be 0", 0, quotaStats.getQuotaPctUsedDelete());
assertEquals("getall usage should be 0", 0, quotaStats.getQuotaPctUsedGetAll());
assertEquals(
"Computed usage pct must be close to actual observed qps",
statTrackingStore.getStats().getThroughput(Tracked.GET),
quotaStats.getQuotaPctUsedGet(),
1.0);
}
