io.github.theangrydev.businessflows.Peek Maven / Gradle / Ivy

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/*
 * Copyright 2016 Liam Williams .
 *
 * This file is part of business-flows.
 *
 * Licensed 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 io.github.theangrydev.businessflows;

/**
 * Similar to a {@link java.util.function.Consumer} but is allowed to throw an {@link Exception}.
 * @param  The type to look at
 */
@FunctionalInterface
public interface Peek {

    /**
     * @param instance The instance to look at (if it is present)
     * @throws Exception If there is a technical failure during the peek
     */
    void peek(T instance) throws Exception;
}