/*
* Copyright (c) 2011-2017 Pivotal Software Inc, All Rights Reserved.
*
* 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 reactor.core.publisher;
import java.util.concurrent.
TimeUnit;
import org.reactivestreams.
Subscription;
import reactor.core.
CoreSubscriber;
import reactor.core.
Fuseable;
import reactor.core.scheduler.
Scheduler;
import reactor.util.annotation.
Nullable;
import reactor.util.function.
Tuple2;
import reactor.util.function.
Tuples;
/**
* @author Stephane Maldini
*/
final class
FluxElapsed<T> extends
FluxOperator<T,
Tuple2<
Long, T>> implements
Fuseable {
final
Scheduler scheduler;
FluxElapsed(
Flux<T>
source,
Scheduler scheduler) {
super(
source);
this.
scheduler =
scheduler;
}
@
Override
public void
subscribe(
CoreSubscriber<? super
Tuple2<
Long, T>>
actual) {
source.
subscribe(new
ElapsedSubscriber<>(
actual,
scheduler));
}
@
Override
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
RUN_ON) return
scheduler;
return super.scanUnsafe(
key);
}
static final class
ElapsedSubscriber<T>
implements
InnerOperator<T,
Tuple2<
Long, T>>,
QueueSubscription<
Tuple2<
Long, T>> {
final
CoreSubscriber<? super
Tuple2<
Long, T>>
actual;
final
Scheduler scheduler;
Subscription s;
QueueSubscription<T>
qs;
long
lastTime;
ElapsedSubscriber(
CoreSubscriber<? super
Tuple2<
Long, T>>
actual,
Scheduler scheduler) {
this.
actual =
actual;
this.
scheduler =
scheduler;
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) return
s;
if (
key ==
Attr.
RUN_ON) return
scheduler;
return
InnerOperator.super.scanUnsafe(
key);
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
lastTime =
scheduler.
now(
TimeUnit.
MILLISECONDS);
this.
s =
s;
actual.
onSubscribe(this);
}
}
@
Override
public
CoreSubscriber<? super
Tuple2<
Long, T>>
actual() {
return
actual;
}
@
Override
public void
onNext(T
t) {
if(
t == null){
actual.
onNext(null);
return;
}
actual.
onNext(
snapshot(
t));
}
@
Override
public void
onError(
Throwable t) {
actual.
onError(
t);
}
@
Override
public void
onComplete() {
actual.
onComplete();
}
@
Override
public void
request(long
n) {
s.
request(
n);
}
@
Override
public void
cancel() {
s.
cancel();
}
@
Override
public int
requestFusion(int
requestedMode) {
QueueSubscription<T>
qs =
Operators.
as(
s);
if (
qs != null) {
this.
qs =
qs;
return
qs.
requestFusion(
requestedMode);
}
return
Fuseable.
NONE;
}
Tuple2<
Long, T>
snapshot(T
data){
long
now =
scheduler.
now(
TimeUnit.
MILLISECONDS);
long
last =
lastTime;
lastTime =
now;
long
delta =
now -
last;
return
Tuples.
of(
delta,
data);
}
@
Override
@
Nullable
public
Tuple2<
Long, T>
poll() {
T
data =
qs.
poll();
if(
data != null){
return
snapshot(
data);
}
return null;
}
@
Override
public int
size() {
return
qs.
size();
}
@
Override
public boolean
isEmpty() {
return
qs.
isEmpty();
}
@
Override
public void
clear() {
qs.
clear();
}
}
}