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An implementation of java.util.logging.LogManager

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/*
 * JBoss, Home of Professional Open Source.
 *
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed 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.jboss.logmanager.errormanager;

import java.util.logging.ErrorManager;

import org.jboss.logmanager.ExtErrorManager;

/**
 * An error manager which runs only once and delegates to the given error manager.
 */
public final class OnlyOnceErrorManager extends ExtErrorManager {

    private volatile ErrorManager delegate;

    /**
     * Construct a new instance.
     *
     * @param delegate the delegate error manager
     */
    public OnlyOnceErrorManager(final ErrorManager delegate) {
        this.delegate = delegate;
    }

    /**
     * Construct a new instance with a {@link SimpleErrorManager} as a delegate.
     */
    public OnlyOnceErrorManager() {
        this(new SimpleErrorManager());
    }

    /** {@inheritDoc} */
    public void error(final String msg, final Exception ex, final int code) {
        ErrorManager delegate = this.delegate;
        if (delegate == null) {
            return;
        } else {
            synchronized (this) {
                delegate = this.delegate;
                if (delegate == null) {
                    return;
                }
                this.delegate = null;
            }
        }
        delegate.error(msg, ex, code);
    }
}