/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.twitter.distributedlog;
import com.twitter.distributedlog.exceptions.OverCapacityException;
import com.twitter.distributedlog.util.PermitLimiter;
import com.twitter.distributedlog.util.SimplePermitLimiter;
import org.apache.bookkeeper.feature.Feature;
import org.apache.bookkeeper.feature.SettableFeature;
import org.apache.bookkeeper.stats.NullStatsLogger;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import scala.runtime.BoxedUnit;
public class TestWriteLimiter {
static final Logger LOG = LoggerFactory.getLogger(TestWriteLimiter.class);
SimplePermitLimiter createPermitLimiter(boolean darkmode, int permits) {
return createPermitLimiter(darkmode, permits, new SettableFeature("", 0));
}
SimplePermitLimiter createPermitLimiter(boolean darkmode, int permits, Feature feature) {
return new SimplePermitLimiter(darkmode, permits, new NullStatsLogger(), false, feature);
}
@Test
public void testGlobalOnly() throws Exception {
SimplePermitLimiter streamLimiter = createPermitLimiter(false, Integer.MAX_VALUE);
SimplePermitLimiter globalLimiter = createPermitLimiter(false, 1);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
try {
limiter.acquire();
fail("should have thrown global limit exception");
} catch (OverCapacityException ex) {
}
assertPermits(streamLimiter, 1, globalLimiter, 1);
limiter.release();
assertPermits(streamLimiter, 0, globalLimiter, 0);
}
@Test
public void testStreamOnly() throws Exception {
SimplePermitLimiter streamLimiter = createPermitLimiter(false, 1);
SimplePermitLimiter globalLimiter = createPermitLimiter(false, Integer.MAX_VALUE);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
try {
limiter.acquire();
fail("should have thrown stream limit exception");
} catch (OverCapacityException ex) {
}
assertPermits(streamLimiter, 1, globalLimiter, 1);
}
@Test
public void testDarkmode() throws Exception {
SimplePermitLimiter streamLimiter = createPermitLimiter(true, Integer.MAX_VALUE);
SimplePermitLimiter globalLimiter = createPermitLimiter(true, 1);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
limiter.acquire();
assertPermits(streamLimiter, 2, globalLimiter, 2);
}
@Test
public void testDarkmodeWithDisabledFeature() throws Exception {
SettableFeature feature = new SettableFeature("test", 10000);
SimplePermitLimiter streamLimiter = createPermitLimiter(true, 1, feature);
SimplePermitLimiter globalLimiter = createPermitLimiter(true, Integer.MAX_VALUE, feature);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
limiter.acquire();
assertPermits(streamLimiter, 2, globalLimiter, 2);
limiter.release();
limiter.release();
assertPermits(streamLimiter, 0, globalLimiter, 0);
}
@Test
public void testDisabledFeature() throws Exception {
// Disable darkmode, but should still ignore limits because of the feature.
SettableFeature feature = new SettableFeature("test", 10000);
SimplePermitLimiter streamLimiter = createPermitLimiter(false, 1, feature);
SimplePermitLimiter globalLimiter = createPermitLimiter(false, Integer.MAX_VALUE, feature);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
limiter.acquire();
assertPermits(streamLimiter, 2, globalLimiter, 2);
limiter.release();
limiter.release();
assertPermits(streamLimiter, 0, globalLimiter, 0);
}
@Test
public void testSetDisableFeatureAfterAcquireAndBeforeRelease() throws Exception {
SettableFeature feature = new SettableFeature("test", 0);
SimplePermitLimiter streamLimiter = createPermitLimiter(false, 2, feature);
SimplePermitLimiter globalLimiter = createPermitLimiter(false, Integer.MAX_VALUE, feature);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
limiter.acquire();
assertPermits(streamLimiter, 2, globalLimiter, 2);
feature.set(10000);
limiter.release();
limiter.release();
assertPermits(streamLimiter, 0, globalLimiter, 0);
}
@Test
public void testUnsetDisableFeatureAfterPermitsExceeded() throws Exception {
SettableFeature feature = new SettableFeature("test", 10000);
SimplePermitLimiter streamLimiter = createPermitLimiter(false, 1, feature);
SimplePermitLimiter globalLimiter = createPermitLimiter(false, Integer.MAX_VALUE, feature);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
limiter.acquire();
limiter.acquire();
limiter.acquire();
assertPermits(streamLimiter, 4, globalLimiter, 4);
feature.set(0);
limiter.release();
assertPermits(streamLimiter, 3, globalLimiter, 3);
try {
limiter.acquire();
fail("should have thrown stream limit exception");
} catch (OverCapacityException ex) {
}
assertPermits(streamLimiter, 3, globalLimiter, 3);
limiter.release();
limiter.release();
limiter.release();
assertPermits(streamLimiter, 0, globalLimiter, 0);
}
@Test
public void testUnsetDisableFeatureBeforePermitsExceeded() throws Exception {
SettableFeature feature = new SettableFeature("test", 0);
SimplePermitLimiter streamLimiter = createPermitLimiter(false, 1, feature);
SimplePermitLimiter globalLimiter = createPermitLimiter(false, Integer.MAX_VALUE, feature);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
try {
limiter.acquire();
fail("should have thrown stream limit exception");
} catch (OverCapacityException ex) {
}
assertPermits(streamLimiter, 1, globalLimiter, 1);
feature.set(10000);
limiter.acquire();
assertPermits(streamLimiter, 2, globalLimiter, 2);
}
@Test
public void testDarkmodeGlobalUnderStreamOver() throws Exception {
SimplePermitLimiter streamLimiter = createPermitLimiter(true, 1);
SimplePermitLimiter globalLimiter = createPermitLimiter(true, 2);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
limiter.acquire();
assertPermits(streamLimiter, 2, globalLimiter, 2);
limiter.release();
limiter.release();
assertPermits(streamLimiter, 0, globalLimiter, 0);
}
@Test
public void testDarkmodeGlobalOverStreamUnder() throws Exception {
SimplePermitLimiter streamLimiter = createPermitLimiter(true, 2);
SimplePermitLimiter globalLimiter = createPermitLimiter(true, 1);
WriteLimiter limiter = new WriteLimiter("test", streamLimiter, globalLimiter);
limiter.acquire();
limiter.acquire();
assertPermits(streamLimiter, 2, globalLimiter, 2);
limiter.release();
assertPermits(streamLimiter, 1, globalLimiter, 1);
limiter.release();
assertPermits(streamLimiter, 0, globalLimiter, 0);
}
void assertPermits(SimplePermitLimiter streamLimiter, int streamPermits, SimplePermitLimiter globalLimiter, int globalPermits) {
assertEquals(streamPermits, streamLimiter.getPermits());
assertEquals(globalPermits, globalLimiter.getPermits());
}
}