/* * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import java.net.http.HttpClient; import java.net.http.HttpRequest; import java.net.http.HttpResponse; import java.nio.ByteBuffer; import java.nio.MappedByteBuffer; import java.util.Collection; import java.util.List; import java.util.concurrent.Flow; import java.util.function.Function; import java.net.http.HttpRequest.BodyPublishers; import java.net.http.HttpResponse.BodyHandler; import java.net.http.HttpResponse.BodyHandlers; import java.net.http.HttpResponse.BodySubscriber; import java.net.http.HttpResponse.BodySubscribers; /* * @test * @summary Basic test for Flow adapters with generic type parameters * @compile FlowAdaptersCompileOnly.java */ public class FlowAdaptersCompileOnly { static void makesSureDifferentGenericSignaturesCompile() { BodyPublishers.fromPublisher(new BBPublisher()); BodyPublishers.fromPublisher(new MBBPublisher()); BodyHandlers.fromSubscriber(new ListSubscriber()); BodyHandlers.fromSubscriber(new CollectionSubscriber()); BodyHandlers.fromSubscriber(new IterableSubscriber()); BodyHandlers.fromSubscriber(new ObjectSubscriber()); BodySubscribers.fromSubscriber(new ListSubscriber()); BodySubscribers.fromSubscriber(new CollectionSubscriber()); BodySubscribers.fromSubscriber(new IterableSubscriber()); BodySubscribers.fromSubscriber(new ObjectSubscriber()); BodyPublishers.fromPublisher(new BBPublisher(), 1); BodyPublishers.fromPublisher(new MBBPublisher(), 1); BodyHandlers.fromSubscriber(new ListSubscriber(), Function.identity()); BodyHandlers.fromSubscriber(new CollectionSubscriber(), Function.identity()); BodyHandlers.fromSubscriber(new IterableSubscriber(), Function.identity()); BodyHandlers.fromSubscriber(new ObjectSubscriber(), Function.identity()); BodySubscribers.fromSubscriber(new ListSubscriber(), Function.identity()); BodySubscribers.fromSubscriber(new CollectionSubscriber(), Function.identity()); BodySubscribers.fromSubscriber(new IterableSubscriber(), Function.identity()); BodySubscribers.fromSubscriber(new ObjectSubscriber(), Function.identity()); } static class BBPublisher implements Flow.Publisher<ByteBuffer> { @Override public void subscribe(Flow.Subscriber<? super ByteBuffer> subscriber) { } } static class MBBPublisher implements Flow.Publisher<MappedByteBuffer> { @Override public void subscribe(Flow.Subscriber<? super MappedByteBuffer> subscriber) { } } static class ListSubscriber implements Flow.Subscriber<List<ByteBuffer>> { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(List<ByteBuffer> item) { } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { } } static class CollectionSubscriber implements Flow.Subscriber<Collection<ByteBuffer>> { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(Collection<ByteBuffer> item) { } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { } } static class IterableSubscriber implements Flow.Subscriber<Iterable<ByteBuffer>> { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(Iterable<ByteBuffer> item) { } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { } } static class ObjectSubscriber implements Flow.Subscriber<Object> { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(Object item) { } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { } } // --- static final Function<ListSubscriber,Integer> f1 = subscriber -> 1; static final Function<ListSubscriber,Number> f2 = subscriber -> 2; static final Function<ListSubscriberX,Integer> f3 = subscriber -> 3; static final Function<ListSubscriberX,Number> f4 = subscriber -> 4; static class ListSubscriberX extends ListSubscriber { int getIntegerX() { return 5; } } static void makesSureDifferentGenericFunctionSignaturesCompile() { BodyHandler<Integer> bh01 = BodyHandlers.fromSubscriber(new ListSubscriber(), s -> 6); BodyHandler<Number> bh02 = BodyHandlers.fromSubscriber(new ListSubscriber(), s -> 7); BodyHandler<Integer> bh03 = BodyHandlers.fromSubscriber(new ListSubscriber(), f1); BodyHandler<Number> bh04 = BodyHandlers.fromSubscriber(new ListSubscriber(), f1); BodyHandler<Number> bh05 = BodyHandlers.fromSubscriber(new ListSubscriber(), f2); BodyHandler<Integer> bh06 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f1); BodyHandler<Number> bh07 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f1); BodyHandler<Number> bh08 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f2); BodyHandler<Integer> bh09 = BodyHandlers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX); BodyHandler<Number> bh10 = BodyHandlers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX); BodyHandler<Integer> bh11 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f3); BodyHandler<Number> bh12 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f3); BodyHandler<Number> bh13 = BodyHandlers.fromSubscriber(new ListSubscriberX(), f4); BodySubscriber<Integer> bs01 = BodySubscribers.fromSubscriber(new ListSubscriber(), s -> 6); BodySubscriber<Number> bs02 = BodySubscribers.fromSubscriber(new ListSubscriber(), s -> 7); BodySubscriber<Integer> bs03 = BodySubscribers.fromSubscriber(new ListSubscriber(), f1); BodySubscriber<Number> bs04 = BodySubscribers.fromSubscriber(new ListSubscriber(), f1); BodySubscriber<Number> bs05 = BodySubscribers.fromSubscriber(new ListSubscriber(), f2); BodySubscriber<Integer> bs06 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f1); BodySubscriber<Number> bs07 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f1); BodySubscriber<Number> bs08 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f2); BodySubscriber<Integer> bs09 = BodySubscribers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX); BodySubscriber<Number> bs10 = BodySubscribers.fromSubscriber(new ListSubscriberX(), ListSubscriberX::getIntegerX); BodySubscriber<Integer> bs11 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f3); BodySubscriber<Number> bs12 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f3); BodySubscriber<Number> bs13 = BodySubscribers.fromSubscriber(new ListSubscriberX(), f4); } // --- static class NumberSubscriber implements Flow.Subscriber<List<ByteBuffer>> { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(List<ByteBuffer> item) { } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { } public Number getNumber() { return null; } } static class IntegerSubscriber extends NumberSubscriber { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(List<ByteBuffer> item) { } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { } public Integer getInteger() { return null; } } static class LongSubscriber extends NumberSubscriber { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(List<ByteBuffer> item) { } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { } public Long getLong() { return null; } } static final Function<NumberSubscriber,Number> numMapper = sub -> sub.getNumber(); static final Function<IntegerSubscriber,Integer> intMapper = sub -> sub.getInteger(); static final Function<LongSubscriber,Long> longMapper = sub -> sub.getLong(); public void makesSureDifferentGenericSubscriberSignaturesCompile() throws Exception { HttpClient client = null; HttpRequest request = null; IntegerSubscriber sub1 = new IntegerSubscriber(); HttpResponse<Integer> r1 = client.send(request, BodyHandlers.fromSubscriber(sub1, IntegerSubscriber::getInteger)); HttpResponse<Number> r2 = client.send(request, BodyHandlers.fromSubscriber(sub1, IntegerSubscriber::getInteger)); HttpResponse<Number> r3 = client.send(request, BodyHandlers.fromSubscriber(sub1, NumberSubscriber::getNumber)); HttpResponse<Integer> r4 = client.send(request, BodyHandlers.fromSubscriber(sub1, intMapper)); HttpResponse<Number> r5 = client.send(request, BodyHandlers.fromSubscriber(sub1, intMapper)); HttpResponse<Number> r6 = client.send(request, BodyHandlers.fromSubscriber(sub1, numMapper)); // compiles but makes little sense. Just what you get with any usage of `? super` final Function<Object,Number> objectMapper = sub -> 1; client.sendAsync(request, BodyHandlers.fromSubscriber(sub1, objectMapper)); // does not compile, as expected ( uncomment to see ) //HttpResponse<Number> r7 = client.send(request, BodyHandler.fromSubscriber(sub1, longMapper)); } }