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Access to the Neo4j graph database through Java
/*
* Copyright (c) 2016-2021 VMware Inc. or its affiliates, 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
*
* https://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.Objects;
import java.util.function.Predicate;
import org.reactivestreams.Subscription;
import reactor.core.CorePublisher;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
/**
* Filters out values that make a filter function return false.
*
* @param the value type
*
* @see Reactive-Streams-Commons
*/
final class FluxFilterFuseable extends InternalFluxOperator implements Fuseable {
final Predicate predicate;
FluxFilterFuseable(Flux source, Predicate predicate) {
super(source);
this.predicate = Objects.requireNonNull(predicate, "predicate");
}
@Override
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
if (actual instanceof ConditionalSubscriber) {
return new FilterFuseableConditionalSubscriber<>((ConditionalSubscriber) actual,
predicate);
}
return new FilterFuseableSubscriber<>(actual, predicate);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class FilterFuseableSubscriber
implements InnerOperator, QueueSubscription,
ConditionalSubscriber {
final CoreSubscriber actual;
final Context ctx;
final Predicate predicate;
QueueSubscription s;
boolean done;
int sourceMode;
FilterFuseableSubscriber(CoreSubscriber actual,
Predicate predicate) {
this.actual = actual;
this.ctx = actual.currentContext();
this.predicate = predicate;
}
@SuppressWarnings("unchecked")
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = (QueueSubscription) s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (sourceMode == ASYNC) {
actual.onNext(null);
}
else {
if (done) {
Operators.onNextDropped(t, this.ctx);
return;
}
boolean b;
try {
b = predicate.test(t);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, this.ctx, s);
if (e_ != null) {
onError(e_);
}
else {
s.request(1);
}
Operators.onDiscard(t, this.ctx);
return;
}
if (b) {
actual.onNext(t);
}
else {
s.request(1);
Operators.onDiscard(t, this.ctx);
}
}
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, this.ctx);
return false;
}
boolean b;
try {
b = predicate.test(t);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, this.ctx, s);
if (e_ != null) {
onError(e_);
}
Operators.onDiscard(t, this.ctx);
return false;
}
if (b) {
actual.onNext(t);
return true;
}
Operators.onDiscard(t, this.ctx);
return false;
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, this.ctx);
return;
}
done = true;
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
actual.onComplete();
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
}
@Override
@Nullable
public T poll() {
if (sourceMode == ASYNC) {
long dropped = 0;
for (; ; ) {
T v = s.poll();
try {
if (v == null || predicate.test(v)) {
if (dropped != 0) {
request(dropped);
}
return v;
}
Operators.onDiscard(v, this.ctx);
dropped++;
}
catch (Throwable e) {
RuntimeException e_ = Operators.onNextPollError(v, e, currentContext());
Operators.onDiscard(v, this.ctx);
if (e_ != null) {
throw e_;
}
//else continue
}
}
}
else {
for (; ; ) {
T v = s.poll();
try {
if (v == null || predicate.test(v)) {
return v;
}
Operators.onDiscard(v, this.ctx);
}
catch (Throwable e) {
RuntimeException e_ = Operators.onNextPollError(v, e, currentContext());
Operators.onDiscard(v, this.ctx);
if (e_ != null) {
throw e_;
}
// else continue
}
}
}
}
@Override
public boolean isEmpty() {
return s.isEmpty();
}
@Override
public void clear() {
s.clear();
}
@Override
public int requestFusion(int requestedMode) {
int m;
if ((requestedMode & Fuseable.THREAD_BARRIER) != 0) {
return Fuseable.NONE;
}
else {
m = s.requestFusion(requestedMode);
}
sourceMode = m;
return m;
}
@Override
public int size() {
return s.size();
}
}
static final class FilterFuseableConditionalSubscriber
implements InnerOperator, ConditionalSubscriber,
QueueSubscription {
final ConditionalSubscriber actual;
final Context ctx;
final Predicate predicate;
QueueSubscription s;
boolean done;
int sourceMode;
FilterFuseableConditionalSubscriber(ConditionalSubscriber actual,
Predicate predicate) {
this.actual = actual;
this.ctx = actual.currentContext();
this.predicate = predicate;
}
@SuppressWarnings("unchecked")
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = (QueueSubscription) s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (sourceMode == ASYNC) {
actual.onNext(null);
}
else {
if (done) {
Operators.onNextDropped(t, this.ctx);
return;
}
boolean b;
try {
b = predicate.test(t);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, this.ctx, s);
if (e_ != null) {
onError(e_);
}
else {
s.request(1);
}
Operators.onDiscard(t, this.ctx);
return;
}
if (b) {
actual.onNext(t);
}
else {
s.request(1);
Operators.onDiscard(t, this.ctx);
}
}
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, this.ctx);
return false;
}
boolean b;
try {
b = predicate.test(t);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, this.ctx, s);
if (e_ != null) {
onError(e_);
}
Operators.onDiscard(t, this.ctx);
return false;
}
if (b) {
return actual.tryOnNext(t);
}
else {
Operators.onDiscard(t, this.ctx);
return false;
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, this.ctx);
return;
}
done = true;
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
actual.onComplete();
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
}
@Override
@Nullable
public T poll() {
if (sourceMode == ASYNC) {
long dropped = 0;
for (; ; ) {
T v = s.poll();
try {
if (v == null || predicate.test(v)) {
if (dropped != 0) {
request(dropped);
}
return v;
}
Operators.onDiscard(v, this.ctx);
dropped++;
}
catch (Throwable e) {
RuntimeException e_ = Operators.onNextPollError(v, e, this.ctx);
Operators.onDiscard(v, this.ctx);
if (e_ != null) {
throw e_;
}
// else continue
}
}
}
else {
for (; ; ) {
T v = s.poll();
try {
if (v == null || predicate.test(v)) {
return v;
}
Operators.onDiscard(v, this.ctx);
}
catch (Throwable e) {
RuntimeException e_ = Operators.onNextPollError(v, e, this.ctx);
Operators.onDiscard(v, this.ctx);
if (e_ != null) {
throw e_;
}
// else continue
}
}
}
}
@Override
public boolean isEmpty() {
return s.isEmpty();
}
@Override
public void clear() {
s.clear();
}
@Override
public int size() {
return s.size();
}
@Override
public int requestFusion(int requestedMode) {
int m;
if ((requestedMode & Fuseable.THREAD_BARRIER) != 0) {
return Fuseable.NONE;
}
else {
m = s.requestFusion(requestedMode);
}
sourceMode = m;
return m;
}
}
}