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/**
* Copyright 2014 Netflix, Inc.
*
* 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 rx;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import rx.Observable.OnSubscribeFunc;
import rx.Scheduler.Inner;
import rx.functions.Action1;
import rx.schedulers.Schedulers;
/**
* Utility for retrieving a mock eventstream for testing.
*/
public class EventStream {
public static Observable<Event> getEventStream(final String type, final int numInstances) {
return Observable.create(new OnSubscribeFunc<Event>() {
@Override
public Subscription onSubscribe(final Observer<? super Event> observer) {
// run on a background thread inside the OnSubscribeFunc so unsubscribe works
return Schedulers.newThread().schedule(new Action1<Inner>() {
@Override
public void call(Inner inner) {
inner.schedule(new Action1<Inner>() {
@Override
public void call(Inner inner) {
while (!(inner.isUnsubscribed() || Thread.currentThread().isInterrupted())) {
observer.onNext(randomEvent(type, numInstances));
try {
// slow it down somewhat
Thread.sleep(50);
} catch (InterruptedException e) {
observer.onError(e);
}
}
observer.onCompleted();
}
});
}
});
}
});
}
public static Event randomEvent(String type, int numInstances) {
Map<String, Object> values = new LinkedHashMap<String, Object>();
values.put("count200", randomIntFrom0to(4000));
values.put("count4xx", randomIntFrom0to(300));
values.put("count5xx", randomIntFrom0to(500));
return new Event(type, "instance_" + randomIntFrom0to(numInstances), values);
}
private static int randomIntFrom0to(int max) {
// XORShift instead of Math.random http://javamex.com/tutorials/random_numbers/xorshift.shtml
long x = System.nanoTime();
x ^= (x << 21);
x ^= (x >>> 35);
x ^= (x << 4);
return Math.abs((int) x % max);
}
public static class Event {
public final String type;
public final String instanceId;
public final Map<String, Object> values;
/**
* @param type
* @param instanceId
* @param values
* This does NOT deep-copy, so do not mutate this Map after passing it in.
*/
public Event(String type, String instanceId, Map<String, Object> values) {
this.type = type;
this.instanceId = instanceId;
this.values = Collections.unmodifiableMap(values);
}
}
}