com.predic8.membrane.core.interceptor.ratelimit.LazyRateLimit Maven / Gradle / Ivy
/* Copyright 2015 predic8 GmbH, www.predic8.com
Licensed 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.predic8.membrane.core.interceptor.ratelimit;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import org.joda.time.DateTime;
import org.joda.time.Duration;
public class LazyRateLimit extends RateLimitStrategy {
private DateTime nextCleanup = new DateTime();
public ConcurrentHashMap requestCounterFromIP = new ConcurrentHashMap();
public LazyRateLimit(Duration requestLimitDuration, int requestLimit) {
this.requestLimitDuration = requestLimitDuration;
this.requestLimit = requestLimit;
incrementNextCleanupTime();
}
@Override
public boolean isRequestLimitReached(String ip) {
synchronized (nextCleanup) {
if (DateTime.now().isAfter(nextCleanup)) {
for (AtomicInteger info : requestCounterFromIP.values()) {
info.set(0);
}
incrementNextCleanupTime();
}
}
addRequestEntry(ip);
return requestCounterFromIP.get(ip).get() > requestLimit;
}
private void addRequestEntry(String addr) {
synchronized (requestCounterFromIP) {
if (!requestCounterFromIP.containsKey(addr)) {
requestCounterFromIP.put(addr, new AtomicInteger());
}
}
requestCounterFromIP.get(addr).incrementAndGet();
}
private void incrementNextCleanupTime() {
nextCleanup = DateTime.now().plus(requestLimitDuration);
}
@Override
public DateTime getServiceAvailableAgainTime(String ip) {
return nextCleanup;
}
@Override
public void updateAfterConfigChange() {
for (AtomicInteger info : requestCounterFromIP.values()) {
info.set(0);
}
incrementNextCleanupTime();
}
}