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CloudConvert is an online file converter API - more than 200 different audio, video, document, ebook, archive, image, spreadsheet and presentation formats supported.

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package com.cloudconvert.dto.result;

import com.cloudconvert.extractor.ResultExtractor;
import com.fasterxml.jackson.core.type.TypeReference;
import lombok.Builder;
import org.apache.http.HttpResponse;
import org.jetbrains.annotations.Nullable;

import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

@Builder
public class FutureAsyncResult extends AsyncResult {

    private ResultExtractor resultExtractor;

    private Future future;

    private TypeReference typeReference;

    @Nullable
    private Result result;

    public Result get() throws InterruptedException, ExecutionException, IOException {
        return extractResult(future.get());
    }

    public Result get(
        final long timeout, final TimeUnit timeUnit
    ) throws InterruptedException, ExecutionException, TimeoutException, IOException {
        return extractResult(future.get(timeout, timeUnit));
    }

    /**
     * This method should be synchronized in order to prevent unexpected behavior if multiple threads tries to access an input stream
     */
    private synchronized Result extractResult(final HttpResponse httpResponse) throws IOException {
        // Cache result, in case user will try to call get() multiple times
        if (result == null) {
            result = resultExtractor.extract(httpResponse, typeReference);
        }
        return result;
    }
}