/*
* Copyright 2016 The Netty Project
*
* The Netty Project 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 io.netty_voltpatches.util.internal;
import io.netty_voltpatches.util.concurrent.Promise;
import io.netty_voltpatches.util.internal.logging.InternalLogger;
/**
* Internal utilities to notify {@link Promise}s.
*/
public final class PromiseNotificationUtil {
private PromiseNotificationUtil() { }
/**
* Try to cancel the {@link Promise} and log if {@code logger} is not {@code null} in case this fails.
*/
public static void tryCancel(Promise<?> p, InternalLogger logger) {
if (!p.cancel(false) && logger != null) {
Throwable err = p.cause();
if (err == null) {
logger.warn("Failed to cancel promise because it has succeeded already: {}", p);
} else {
logger.warn(
"Failed to cancel promise because it has failed already: {}, unnotified cause:",
p, err);
}
}
}
/**
* Try to mark the {@link Promise} as success and log if {@code logger} is not {@code null} in case this fails.
*/
public static <V> void trySuccess(Promise<? super V> p, V result, InternalLogger logger) {
if (!p.trySuccess(result) && logger != null) {
Throwable err = p.cause();
if (err == null) {
logger.warn("Failed to mark a promise as success because it has succeeded already: {}", p);
} else {
logger.warn(
"Failed to mark a promise as success because it has failed already: {}, unnotified cause:",
p, err);
}
}
}
/**
* Try to mark the {@link Promise} as failure and log if {@code logger} is not {@code null} in case this fails.
*/
public static void tryFailure(Promise<?> p, Throwable cause, InternalLogger logger) {
if (!p.tryFailure(cause) && logger != null) {
Throwable err = p.cause();
if (err == null) {
logger.warn("Failed to mark a promise as failure because it has succeeded already: {}", p, cause);
} else {
logger.warn(
"Failed to mark a promise as failure because it has failed already: {}, unnotified cause: {}",
p, ThrowableUtil.stackTraceToString(err), cause);
}
}
}
}