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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}