77 lines
2.9 KiB
Java
77 lines
2.9 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.internal;
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import io.netty.util.concurrent.Promise;
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import io.netty.util.internal.logging.InternalLogger;
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/**
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* Internal utilities to notify {@link Promise}s.
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*/
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public final class PromiseNotificationUtil {
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private PromiseNotificationUtil() { }
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/**
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* Try to cancel the {@link Promise} and log if {@code logger} is not {@code null} in case this fails.
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*/
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public static void tryCancel(Promise<?> p, InternalLogger logger) {
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if (!p.cancel(false) && logger != null) {
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Throwable err = p.cause();
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if (err == null) {
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logger.warn("Failed to cancel promise because it has succeeded already: {}", p);
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} else {
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logger.warn(
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"Failed to cancel promise because it has failed already: {}, unnotified cause:",
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p, err);
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}
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}
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}
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/**
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* Try to mark the {@link Promise} as success and log if {@code logger} is not {@code null} in case this fails.
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*/
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public static <V> void trySuccess(Promise<? super V> p, V result, InternalLogger logger) {
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if (!p.trySuccess(result) && logger != null) {
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Throwable err = p.cause();
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if (err == null) {
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logger.warn("Failed to mark a promise as success because it has succeeded already: {}", p);
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} else {
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logger.warn(
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"Failed to mark a promise as success because it has failed already: {}, unnotified cause:",
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p, err);
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}
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}
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}
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/**
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* Try to mark the {@link Promise} as failure and log if {@code logger} is not {@code null} in case this fails.
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*/
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public static void tryFailure(Promise<?> p, Throwable cause, InternalLogger logger) {
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if (!p.tryFailure(cause) && logger != null) {
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Throwable err = p.cause();
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if (err == null) {
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logger.warn("Failed to mark a promise as failure because it has succeeded already: {}", p, cause);
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} else if (logger.isWarnEnabled()) {
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logger.warn(
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"Failed to mark a promise as failure because it has failed already: {}, unnotified cause: {}",
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p, ThrowableUtil.stackTraceToString(err), cause);
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}
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}
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}
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}
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