    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
    015package 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 */
    022public 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}