/*
* 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.
AbstractQueue;
import java.util.
Iterator;
import java.util.concurrent.atomic.
AtomicLongFieldUpdater;
import java.util.function.
BooleanSupplier;
import org.reactivestreams.
Subscription;
import reactor.core.
CoreSubscriber;
import reactor.util.annotation.
Nullable;
import reactor.util.context.
Context;
/**
* @author Stephane Maldini
*/
final class
FluxMaterialize<T> extends
FluxOperator<T,
Signal<T>> {
FluxMaterialize(
Flux<T>
source) {
super(
source);
}
@
Override
public void
subscribe(
CoreSubscriber<? super
Signal<T>>
actual) {
source.
subscribe(new
MaterializeSubscriber<>(
actual));
}
final static class
MaterializeSubscriber<T>
extends
AbstractQueue<
Signal<T>>
implements
InnerOperator<T,
Signal<T>>,
BooleanSupplier {
final
CoreSubscriber<? super
Signal<T>>
actual;
final
Context cachedContext;
Signal<T>
terminalSignal;
volatile boolean
cancelled;
volatile long
requested;
@
SuppressWarnings("rawtypes")
static final
AtomicLongFieldUpdater<
MaterializeSubscriber>
REQUESTED =
AtomicLongFieldUpdater.
newUpdater(
MaterializeSubscriber.class, "requested");
long
produced;
Subscription s;
MaterializeSubscriber(
CoreSubscriber<? super
Signal<T>>
subscriber) {
this.
actual =
subscriber;
this.
cachedContext =
actual.
currentContext();
}
@
Override
public
Context currentContext() {
return
cachedContext;
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) return
s;
if (
key ==
Attr.
TERMINATED) return
terminalSignal != null;
if (
key ==
Attr.
ERROR) return
terminalSignal != null ?
terminalSignal.
getThrowable() : null;
if (
key ==
Attr.
CANCELLED) return
getAsBoolean();
if (
key ==
Attr.
REQUESTED_FROM_DOWNSTREAM) return
requested;
if (
key ==
Attr.
BUFFERED) return
size();
return
InnerOperator.super.scanUnsafe(
key);
}
@
Override
public
CoreSubscriber<? super
Signal<T>>
actual() {
return
actual;
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s =
s;
actual.
onSubscribe(this);
}
}
@
Override
public void
onNext(T
ev) {
if(
terminalSignal != null){
Operators.
onNextDropped(
ev, this.
cachedContext);
return;
}
produced++;
actual.
onNext(
Signal.
next(
ev, this.
cachedContext));
}
@
Override
public void
onError(
Throwable ev) {
if(
terminalSignal != null){
Operators.
onErrorDropped(
ev, this.
cachedContext);
return;
}
terminalSignal =
Signal.
error(
ev, this.
cachedContext);
long
p =
produced;
if (
p != 0L) {
Operators.
addCap(
REQUESTED, this, -
p);
}
DrainUtils.
postComplete(
actual, this,
REQUESTED, this, this);
}
@
Override
public void
onComplete() {
if(
terminalSignal != null){
return;
}
terminalSignal =
Signal.
complete(this.
cachedContext);
long
p =
produced;
if (
p != 0L) {
Operators.
addCap(
REQUESTED, this, -
p);
}
DrainUtils.
postComplete(
actual, this,
REQUESTED, this, this);
}
@
Override
public void
request(long
n) {
if (
Operators.
validate(
n)) {
if (!
DrainUtils.
postCompleteRequest(
n,
actual, this,
REQUESTED, this, this)) {
s.
request(
n);
}
}
}
@
Override
public void
cancel() {
if(
cancelled){
return;
}
cancelled = true;
s.
cancel();
}
@
Override
public boolean
getAsBoolean() {
return
cancelled;
}
@
Override
public boolean
offer(
Signal<T>
e) {
throw new
UnsupportedOperationException();
}
@
Override
@
Nullable
@
SuppressWarnings("unchecked")
public
Signal<T>
poll() {
Signal<T>
v =
terminalSignal;
if (
v != null &&
v !=
empty) {
terminalSignal = (
Signal<T>)
empty;
return
v;
}
return null;
}
@
Override
@
Nullable
public
Signal<T>
peek() {
return
empty ==
terminalSignal ? null :
terminalSignal;
}
@
Override
public
Iterator<
Signal<T>>
iterator() {
throw new
UnsupportedOperationException();
}
@
Override
public int
size() {
return
terminalSignal == null ||
terminalSignal ==
empty ? 0 : 1;
}
static final
Signal empty = new
ImmutableSignal<>(
Context.
empty(),
SignalType.
ON_NEXT, null, null, null);
}
}