    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
    015package org.apache.tapestry5.internal.transform;
    016
    017/**
    018 * Manages a cache value as the result of invoking a no-arguments method.
    019 */
    020public 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}