    001    // Copyright 2006 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    //     http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.ioc.services;
    016
    017    /**
    018     * Used by {@link org.apache.tapestry5.ioc.services.LoggingDecorator} to track which exceptions have been logged during
    019     * the current request (the ExceptionTracker is perthread). This keeps redundant information from appearing in the
    020     * console output.
    021     */
    022    public interface ExceptionTracker
    023    {
    024        /**
    025         * Returns true if the indicated exception has already been logged (it is assumed that the exception will be logged
    026         * if this method returns false). The exception is recorded for later checks.
    027         *
    028         * @param exception to check
    029         * @return false if the exception has not been previously checked, true otherwise
    030         */
    031        boolean exceptionLogged(Throwable exception);
    032    }