mattisonchao commented on code in PR #20855: URL: https://github.com/apache/pulsar/pull/20855#discussion_r1273166235
########## pulsar-common/src/main/java/org/apache/pulsar/common/util/CompletableFutures.java: ########## @@ -0,0 +1,59 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.pulsar.common.util; + +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.CompletionStage; +import java.util.function.Supplier; +import javax.annotation.Nonnull; +import lombok.experimental.UtilityClass; + +@UtilityClass +public final class CompletableFutures { + public static <T> @Nonnull CompletionStage<T> apply(@Nonnull Supplier<T> fn) { + try { + final CompletableFuture<T> future = new CompletableFuture<>(); + if (fn == null) { Review Comment: It can be null, the @nonNull annotation is just a label for it. No NPE check. ########## pulsar-common/src/main/java/org/apache/pulsar/common/util/CompletableFutures.java: ########## @@ -0,0 +1,59 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.pulsar.common.util; + +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.CompletionStage; +import java.util.function.Supplier; +import javax.annotation.Nonnull; +import lombok.experimental.UtilityClass; + +@UtilityClass +public final class CompletableFutures { + public static <T> @Nonnull CompletionStage<T> apply(@Nonnull Supplier<T> fn) { + try { + final CompletableFuture<T> future = new CompletableFuture<>(); + if (fn == null) { + future.completeExceptionally(new NullPointerException("Parameter can not be null.")); + return future; + } + future.complete(fn.get()); + return future; + } catch (Throwable ex) { + final CompletableFuture<T> future = new CompletableFuture<>(); + future.completeExceptionally(ex); + return future; + } + } + + public static <T> @Nonnull CompletionStage<T> compose(@Nonnull Supplier<CompletionStage<T>> fn) { + try { + if (fn == null) { Review Comment: It can be null, the @nonNull annotation is just a label for it. No NPE check. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
