    001    // Copyright 2010 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.internal.transform;
    016
    017    /**
    018     * Manages a cache value as the result of invoking a no-arguments method.
    019     */
    020    public interface MethodResultCache
    021    {
    022        /** Returns true if the cache contains a cached value. May also check to see if the cached value is valid. */
    023        boolean isCached();
    024
    025        /** Stores a new cached value for later reference. */
    026        void set(Object cachedValue);
    027
    028        /** Returns the previously cached value, if any. */
    029        Object get();
    030
    031        /** Resets the cache, discarding the cached value. */
    032        void reset();
    033    }