RequestCache.java example

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/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.concurrency.caching;

import java.lang.annotation.AnnotationFormatError;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.web.context.request.RequestAttributes;

/**
 * Marks a method whose result should be cached in the current {@link RequestAttributes}. If there
 * is no current request no caching is done.
 *
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface RequestCache {
    /** If null return values should be cached */
    boolean cacheNull() default false;

    /** If exceptions should be cached and rethrown */
    boolean cacheException() default false;

    /**
     * Array of booleans designating which parameters should be used in the key. If the array is
     * empty all parameters are included. If the array length is different than the number of
     * parameters an {@link AnnotationFormatError} is thrown
     */
    boolean[] keyMask() default {};
}