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VAVR compose Try
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| package com.dgt; | |
| import io.vavr.control.Option; | |
| import io.vavr.control.Try; | |
| import java.io.IOException; | |
| import java.io.StringReader; | |
| // based on http://blog.vavr.io/vavr-one-log-02/ | |
| public class ComposeVavrTry { | |
| public static void main(String[] args) { | |
| App app = new App(); | |
| Try.of(app::readHeader) | |
| .map(Option::get) | |
| .mapTry(app::readBody) | |
| .onSuccess(s -> System.out.println(String.format("success: %s", s))) | |
| .onFailure(throwable -> System.out.println(throwable.getMessage())); | |
| } | |
| public Option<String> readHeader() throws IOException { | |
| try (FakeReader headerReader = new FakeReader("HeaderReader")) { | |
| // if (true) throw new RuntimeException("BOOOYA"); | |
| // return Option.of(headerReader.fakeReading()); | |
| return Option.none(); | |
| } | |
| } | |
| public Option<String> readBody(String header) throws IOException { | |
| try (FakeReader bodyReader = new FakeReader("BodyReader")) { | |
| // if (true) throw new RuntimeException("BOOOYAKA"); | |
| return Option.of(String.format("%s - %s", header, bodyReader.fakeReading())); | |
| } | |
| } | |
| class FakeReader extends StringReader implements AutoCloseable { | |
| private final String s; | |
| public FakeReader(String s) { | |
| super(s); | |
| this.s = s; | |
| } | |
| public String fakeReading() throws IOException { | |
| StringBuffer buff = new StringBuffer(); | |
| int c = read(); | |
| while (c != -1) { | |
| buff.append((char) c); | |
| c = read(); | |
| } | |
| return buff.toString(); | |
| } | |
| @Override | |
| public void close() { | |
| super.close(); | |
| System.out.println(String.format("%s has been closed", s)); | |
| } | |
| } | |
| } | |
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