flink-spector-master/flinkspector-core/src/main/java/io/flinkspector/core/runtime/SimpleOutputVerifier.java
/*
 * Copyright 2015 Otto (GmbH & Co KG)
 *
 * 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.flinkspector.core.runtime;

import java.util.ArrayList;
import java.util.List;

/**
 * Extend this abstract class a simple {@link OutputVerifier}
 * the verify method will be called after the final
 * record has arrived in the sink
 *
 * @param <T>
 */
public abstract class SimpleOutputVerifier<T> implements OutputVerifier<T> {

    private List<T> output = new ArrayList<>();

    /**
     * This method is called once all output has arrived in the endpoint.
     * to verify the output.
     *
     * @param output from the test run
     */
    public abstract void verify(List<T> output) throws FlinkTestFailedException;

    @Override
    public void init() {
        output = new ArrayList<>();
    }

    @Override
    public void receive(T record) throws FlinkTestFailedException {
        output.add(record);
    }

    @Override
    public void finish() throws FlinkTestFailedException {
        verify(output);
    }

}
