import com.google.common.collect.Maps;
import com.google.common.io.ByteStreams;
import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Map;

import static org.junit.Assert.assertTrue;

/**
 * Java Serialization Sample Code.
 * <p/>
 */
public class JavaSerializationTest {

    @Test
    public void serializeDeserialize() throws IOException, ClassNotFoundException {

        final String outputFilePath = "/tmp/object.ser";

        // Sample object
        Map object = Maps.newHashMap();
        object.put("a", "b");

        // Do serialize object
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(object);
        oos.flush();
        oos.close();
        bos.close();
        byte[] bytes = bos.toByteArray();

        // Write to file
        FileOutputStream fileOutputStream = new FileOutputStream(outputFilePath);
        fileOutputStream.write(bytes);
        fileOutputStream.close();

        assertTrue(new File(outputFilePath).isFile());

        // Do deserialize object
        FileInputStream fileInputStream = new FileInputStream(outputFilePath);
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(ByteStreams.toByteArray(fileInputStream));
        ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
        Object readObject = objectInputStream.readObject();
        System.out.println(readObject);

        assertTrue(readObject instanceof Map);
    }
}