io.netty.util.Signal Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

There is a newer version: 35.0.0.Beta1

Show newest version

/*
 * Copyright 2012 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.util;


import io.netty.util.internal.PlatformDependent;

import java.util.concurrent.ConcurrentMap;

/**
 * A special {@link Error} which is used to signal some state or request by throwing it.
 * {@link Signal} has an empty stack trace and has no cause to save the instantiation overhead.
 */
public final class Signal extends Error {

    private static final long serialVersionUID = -221145131122459977L;

    private static final ConcurrentMap map = PlatformDependent.newConcurrentHashMap();

    @SuppressWarnings("deprecation")
    private final UniqueName uname;

    /**
     * Creates a new {@link Signal} with the specified {@code name}.
     */
    @SuppressWarnings("deprecation")
    public static Signal valueOf(String name) {
        return new Signal(name);
    }

    /**
     * @deprecated Use {@link #valueOf(String)} instead.
     */
    @Deprecated
    public Signal(String name) {
        super(name);
        uname = new UniqueName(map, name);
    }

    /**
     * Check if the given {@link Signal} is the same as this instance. If not an {@link IllegalStateException} will
     * be thrown.
     */
    public void expect(Signal signal) {
        if (this != signal) {
            throw new IllegalStateException("unexpected signal: " + signal);
        }
    }

    @Override
    public Throwable initCause(Throwable cause) {
        return this;
    }

    @Override
    public Throwable fillInStackTrace() {
        return this;
    }

    @Override
    public String toString() {
        return uname.name();
    }
}