GridAbsPredicate.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.apache.ignite.internal.util.lang;

import org.apache.ignite.internal.util.typedef.P1;

/**
 * Defines absolute (no-arg) predicate construct. Predicate like closure is a first-class function
 * that is defined with (or closed over) its free variables that are bound to the closure
 * scope at execution.
 * <h2 class="header">Type Alias</h2>
 * To provide for more terse code you can use a typedef {@link P1} class or various factory methods in
 * {@link GridFunc} class. Note, however, that since typedefs in Java rely on inheritance you should
 * not use these type aliases in signatures.
 * <h2 class="header">Thread Safety</h2>
 * Note that this interface does not impose or assume any specific thread-safety by its
 * implementations. Each implementation can elect what type of thread-safety it provides,
 * if any.
 * @see P1
 * @see GridFunc
 */
public interface GridAbsPredicate {
    /**
     * Predicate body.
     *
     * @return Return value.
     */
    public boolean apply();
}