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Copy internal helper methods from RxJava to avoid OSGi problems
1 parent b8a5acf commit bf9a541

33 files changed

Lines changed: 4207 additions & 56 deletions

‎README.md‎

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@@ -21,7 +21,7 @@ Check out the [https://github.com/akarnokd/RxJavaBridge](https://github.com/akar
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```
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dependencies {
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compile "com.github.akarnokd:rxjava3-interop:3.0.0"
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compile "com.github.akarnokd:rxjava3-interop:3.0.1"
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}
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```
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‎gradle.properties‎

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@@ -1,6 +1,6 @@
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GROUP=com.github.akarnokd
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VERSION_NAME=3.0.0
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version=3.0.0
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VERSION_NAME=3.0.1
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version=3.0.1
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POM_ARTIFACT_ID=rxjava3-interop
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POM_NAME=Interop library between RxJava 1.x and 3.x

‎src/main/java/hu/akarnokd/rxjava3/interop/BackpressureHelper.java‎

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/*
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* Copyright 2016-2020 David Karnok
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package hu.akarnokd.rxjava3.interop;
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import java.util.concurrent.atomic.AtomicLong;
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import io.reactivex.rxjava3.annotations.NonNull;
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import io.reactivex.rxjava3.plugins.RxJavaPlugins;
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/**
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* Utility class to help with backpressure-related operations such as request aggregation.
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*/
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final class BackpressureHelper {
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/** Utility class. */
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private BackpressureHelper() {
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throw new IllegalStateException("No instances!");
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}
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/**
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* Adds two long values and caps the sum at {@link Long#MAX_VALUE}.
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* @param a the first value
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* @param b the second value
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* @return the sum capped at {@link Long#MAX_VALUE}
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*/
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public static long addCap(long a, long b) {
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long u = a + b;
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if (u < 0L) {
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return Long.MAX_VALUE;
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}
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return u;
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}
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/**
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* Multiplies two long values and caps the product at {@link Long#MAX_VALUE}.
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* @param a the first value
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* @param b the second value
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* @return the product capped at {@link Long#MAX_VALUE}
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*/
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public static long multiplyCap(long a, long b) {
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long u = a * b;
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if (((a | b) >>> 31) != 0) {
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if (u / a != b) {
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return Long.MAX_VALUE;
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}
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}
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return u;
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}
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/**
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* Atomically adds the positive value n to the requested value in the {@link AtomicLong} and
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* caps the result at {@link Long#MAX_VALUE} and returns the previous value.
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* @param requested the {@code AtomicLong} holding the current requested value
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* @param n the value to add, must be positive (not verified)
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* @return the original value before the add
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*/
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public static long add(@NonNull AtomicLong requested, long n) {
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for (;;) {
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long r = requested.get();
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if (r == Long.MAX_VALUE) {
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return Long.MAX_VALUE;
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}
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long u = addCap(r, n);
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if (requested.compareAndSet(r, u)) {
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return r;
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}
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}
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}
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/**
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* Atomically adds the positive value n to the requested value in the {@link AtomicLong} and
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* caps the result at {@link Long#MAX_VALUE} and returns the previous value and
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* considers {@link Long#MIN_VALUE} as a cancel indication (no addition then).
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* @param requested the {@code AtomicLong} holding the current requested value
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* @param n the value to add, must be positive (not verified)
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* @return the original value before the add
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*/
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public static long addCancel(@NonNull AtomicLong requested, long n) {
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for (;;) {
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long r = requested.get();
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if (r == Long.MIN_VALUE) {
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return Long.MIN_VALUE;
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}
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if (r == Long.MAX_VALUE) {
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return Long.MAX_VALUE;
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}
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long u = addCap(r, n);
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if (requested.compareAndSet(r, u)) {
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return r;
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}
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}
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}
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/**
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* Atomically subtract the given number (positive, not validated) from the target field unless it contains {@link Long#MAX_VALUE}.
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* @param requested the target field holding the current requested amount
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* @param n the produced element count, positive (not validated)
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* @return the new amount
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*/
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public static long produced(@NonNull AtomicLong requested, long n) {
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for (;;) {
115+
long current = requested.get();
116+
if (current == Long.MAX_VALUE) {
117+
return Long.MAX_VALUE;
118+
}
119+
long update = current - n;
120+
if (update < 0L) {
121+
RxJavaPlugins.onError(new IllegalStateException("More produced than requested: " + update));
122+
update = 0L;
123+
}
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if (requested.compareAndSet(current, update)) {
125+
return update;
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}
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}
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}
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/**
131+
* Atomically subtract the given number (positive, not validated) from the target field if
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* it doesn't contain {@link Long#MIN_VALUE} (indicating some cancelled state) or {@link Long#MAX_VALUE} (unbounded mode).
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* @param requested the target field holding the current requested amount
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* @param n the produced element count, positive (not validated)
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* @return the new amount
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*/
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public static long producedCancel(@NonNull AtomicLong requested, long n) {
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for (;;) {
139+
long current = requested.get();
140+
if (current == Long.MIN_VALUE) {
141+
return Long.MIN_VALUE;
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}
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if (current == Long.MAX_VALUE) {
144+
return Long.MAX_VALUE;
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}
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long update = current - n;
147+
if (update < 0L) {
148+
RxJavaPlugins.onError(new IllegalStateException("More produced than requested: " + update));
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update = 0L;
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}
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if (requested.compareAndSet(current, update)) {
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return update;
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}
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}
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}
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}

‎src/main/java/hu/akarnokd/rxjava3/interop/CompletableV1ToCompletableV3.java‎

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@@ -1,5 +1,5 @@
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/*
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* Copyright 2016-2018 David Karnok
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* Copyright 2016-2020 David Karnok
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.

‎src/main/java/hu/akarnokd/rxjava3/interop/CompletableV1ToMaybeV3.java‎

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@@ -1,5 +1,5 @@
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/*
2-
* Copyright 2016-2018 David Karnok
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* Copyright 2016-2020 David Karnok
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.

‎src/main/java/hu/akarnokd/rxjava3/interop/CompletableV3ToCompletableV1.java‎

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/*
2-
* Copyright 2016-2018 David Karnok
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* Copyright 2016-2020 David Karnok
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.

‎src/main/java/hu/akarnokd/rxjava3/interop/DisposableHelper.java‎

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/*
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* Copyright 2016-2020 David Karnok
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
5+
* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
11+
* distributed under the License is distributed on an "AS IS" BASIS,
12+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13+
* See the License for the specific language governing permissions and
14+
* limitations under the License.
15+
*/
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17+
package hu.akarnokd.rxjava3.interop;
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import java.util.Objects;
20+
import java.util.concurrent.atomic.AtomicReference;
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import io.reactivex.rxjava3.disposables.Disposable;
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import io.reactivex.rxjava3.exceptions.ProtocolViolationException;
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import io.reactivex.rxjava3.plugins.RxJavaPlugins;
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/**
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* Utility methods for working with Disposables atomically.
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*/
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enum DisposableHelper implements Disposable {
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/**
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* The singleton instance representing a terminal, disposed state, don't leak it.
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*/
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DISPOSED
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;
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/**
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* Checks if the given Disposable is the common {@link #DISPOSED} enum value.
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* @param d the disposable to check
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* @return true if d is {@link #DISPOSED}
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*/
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public static boolean isDisposed(Disposable d) {
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return d == DISPOSED;
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}
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/**
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* Atomically sets the field to the given non-null Disposable and returns true
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* or returns false if the field is non-null.
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* If the target field contains the common DISPOSED instance, the supplied disposable
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* is disposed. If the field contains other non-null Disposable, an IllegalStateException
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* is signalled to the RxJavaPlugins.onError hook.
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*
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* @param field the target field
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* @param d the disposable to set, not null
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* @return true if the operation succeeded, false
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*/
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public static boolean setOnce(AtomicReference<Disposable> field, Disposable d) {
57+
Objects.requireNonNull(d, "d is null");
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if (!field.compareAndSet(null, d)) {
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d.dispose();
60+
if (field.get() != DISPOSED) {
61+
reportDisposableSet();
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}
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return false;
64+
}
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return true;
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}
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/**
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* Atomically disposes the Disposable in the field if not already disposed.
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* @param field the target field
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* @return true if the current thread managed to dispose the Disposable
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*/
73+
public static boolean dispose(AtomicReference<Disposable> field) {
74+
Disposable current = field.get();
75+
Disposable d = DISPOSED;
76+
if (current != d) {
77+
current = field.getAndSet(d);
78+
if (current != d) {
79+
if (current != null) {
80+
current.dispose();
81+
}
82+
return true;
83+
}
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}
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return false;
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}
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/**
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* Verifies that current is null, next is not null, otherwise signals errors
90+
* to the RxJavaPlugins and returns false.
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* @param current the current Disposable, expected to be null
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* @param next the next Disposable, expected to be non-null
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* @return true if the validation succeeded
94+
*/
95+
public static boolean validate(Disposable current, Disposable next) {
96+
if (next == null) {
97+
RxJavaPlugins.onError(new NullPointerException("next is null"));
98+
return false;
99+
}
100+
if (current != null) {
101+
next.dispose();
102+
reportDisposableSet();
103+
return false;
104+
}
105+
return true;
106+
}
107+
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/**
109+
* Reports that the disposable is already set to the RxJavaPlugins error handler.
110+
*/
111+
public static void reportDisposableSet() {
112+
RxJavaPlugins.onError(new ProtocolViolationException("Disposable already set!"));
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}
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/**
116+
* Atomically tries to set the given Disposable on the field if it is null or disposes it if
117+
* the field contains {@link #DISPOSED}.
118+
* @param field the target field
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* @param d the disposable to set
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* @return true if successful, false otherwise
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*/
122+
public static boolean trySet(AtomicReference<Disposable> field, Disposable d) {
123+
if (!field.compareAndSet(null, d)) {
124+
if (field.get() == DISPOSED) {
125+
d.dispose();
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}
127+
return false;
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}
129+
return true;
130+
}
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@Override
133+
public void dispose() {
134+
// deliberately no-op
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}
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@Override
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public boolean isDisposed() {
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return true;
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}
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}

‎src/main/java/hu/akarnokd/rxjava3/interop/DisposableV3ToSubscriptionV1.java‎

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/*
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* Copyright 2016-2018 David Karnok
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* Copyright 2016-2020 David Karnok
33
*
44
* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.

‎src/main/java/hu/akarnokd/rxjava3/interop/FlowableV3ToObservableV1.java‎

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/*
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* Copyright 2016-2018 David Karnok
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* Copyright 2016-2020 David Karnok
33
*
44
* Licensed under the Apache License, Version 2.0 (the "License");
55
* you may not use this file except in compliance with the License.
@@ -58,23 +58,23 @@ static final class SourceSubscriber<T>
5858
@Override
5959
public void request(long n) {
6060
if (n != 0L) {
61-
io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper.deferredRequest(this, requested, n);
61+
SubscriptionHelper.deferredRequest(this, requested, n);
6262
}
6363
}
6464

6565
@Override
6666
public void unsubscribe() {
67-
io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper.cancel(this);
67+
SubscriptionHelper.cancel(this);
6868
}
6969

7070
@Override
7171
public boolean isUnsubscribed() {
72-
return io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper.CANCELLED == get();
72+
return SubscriptionHelper.CANCELLED == get();
7373
}
7474

7575
@Override
7676
public void onSubscribe(org.reactivestreams.Subscription s) {
77-
io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper.deferredSetOnce(this, requested, s);
77+
SubscriptionHelper.deferredSetOnce(this, requested, s);
7878
}
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@Override

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