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‎README.md

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@@ -4,24 +4,42 @@ A repository for my live-coding talk [Modern Java in Action](https://nipafx.dev/
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## Next
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Sealed types:
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* `sealed interface Page permits ErrorPage, SuccessfulPage` with `URI url()`
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* `sealed interface SuccessfulPage extends Page permits ExternalPage, GitHubPage` with `String content()`
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* `sealed interface GitHubPage extends SuccessfulPage permits GitHubIssuePage, GitHubPrPage` with `Set<Page> links()` and
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Operations:
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* implement methods in `Pretty`:
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```java
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default Stream<Page> subtree() {
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var subtree = new ArrayList<Page>(Set.of(this));
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var upcomingPages = new LinkedHashSet<>(this.links());
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public static String pageList(Page rootPage) {
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if (!(rootPage instanceof GitHubPage ghPage))
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return pageName(rootPage);
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while (!upcomingPages.isEmpty()) {
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var nextPage = upcomingPages.removeFirst();
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if (!subtree.contains(nextPage) && nextPage instanceof GitHubPage nextGhPage)
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new LinkedHashSet<>(nextGhPage.links())
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.reversed()
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.forEach(upcomingPages::addFirst);
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subtree.add(nextPage);
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}
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return ghPage
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.subtree()
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.map(Pretty::pageName)
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.collect(joining("\n"));
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}
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public static String pageName(Page page) {
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return switch (page) {
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case ErrorPage(URI url, _) -> "💥 ERROR: " + url.getHost();
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case ExternalPage(URI url, _) -> "💤 EXTERNAL: " + url.getHost();
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case GitHubIssuePage(_, _, _, int nr) -> "🐈 ISSUE #" + nr;
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case GitHubPrPage(_, _, _, int nr) -> "🐙 PR #" + nr;
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};
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}
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```
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* implement `Statistician::evaluatePage`:
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```java
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private void evaluatePage(Page page) {
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if (evaluatedPages.contains(page))
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return;
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evaluatedPages.add(page);
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return subtree.stream();
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switch (page) {
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case ErrorPage _ -> numberOfErrors++;
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case ExternalPage _ -> numberOfExternalLinks++;
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case GitHubIssuePage _ -> numberOfIssues++;
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case GitHubPrPage _ -> numberOfPrs++;
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}
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}
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```
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Run `GitHubCrawl`.

‎src/main/java/dev/nipafx/demo/modern/GitHubCrawl.java

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@@ -1,7 +1,14 @@
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package dev.nipafx.demo.modern;
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import dev.nipafx.demo.modern.operations.Pretty;
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import dev.nipafx.demo.modern.operations.Statistician;
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import dev.nipafx.demo.modern.page.ExternalPage;
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import dev.nipafx.demo.modern.page.GitHubIssuePage;
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import dev.nipafx.demo.modern.page.GitHubPrPage;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.util.Set;
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public class GitHubCrawl {
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@@ -12,6 +19,14 @@ public class GitHubCrawl {
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public static void main(String[] args) throws Exception {
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var config = Configuration.parse(args);
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var rootPage = new GitHubIssuePage(URI.create("https://github.com/junit-pioneer/junit-pioneer/issues/624"), "",
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Set.of(
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new GitHubPrPage(URI.create("https://github.com/junit-pioneer/junit-pioneer/pull/629"), "", Set.of(), 629),
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new ExternalPage(URI.create("https://fasterxml.github.io/jackson-databind/javadoc/2.7/com/fasterxml/jackson/databind/ObjectMapper.html#findAndRegisterModules()"), "")
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), 624);
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System.out.println(Statistician.evaluate(rootPage));
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System.out.println(Pretty.pageList(rootPage));
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}
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private record Configuration(URI seedUrl, int depth) {

‎src/main/java/dev/nipafx/demo/modern/operations/Pretty.java

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@@ -0,0 +1,30 @@
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package dev.nipafx.demo.modern.operations;
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import dev.nipafx.demo.modern.page.ErrorPage;
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import dev.nipafx.demo.modern.page.ExternalPage;
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import dev.nipafx.demo.modern.page.GitHubIssuePage;
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import dev.nipafx.demo.modern.page.GitHubPage;
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import dev.nipafx.demo.modern.page.GitHubPrPage;
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import dev.nipafx.demo.modern.page.Page;
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import java.net.URI;
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import static java.util.stream.Collectors.joining;
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public class Pretty {
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private Pretty() {
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// private constructor to prevent instantiation
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}
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public static String pageList(Page rootPage) {
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// TODO
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return "";
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}
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public static String pageName(Page page) {
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// TODO
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return "";
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}
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}

‎src/main/java/dev/nipafx/demo/modern/operations/Statistician.java

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package dev.nipafx.demo.modern.operations;
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import dev.nipafx.demo.modern.page.ErrorPage;
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import dev.nipafx.demo.modern.page.ExternalPage;
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import dev.nipafx.demo.modern.page.GitHubIssuePage;
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import dev.nipafx.demo.modern.page.GitHubPage;
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import dev.nipafx.demo.modern.page.GitHubPrPage;
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import dev.nipafx.demo.modern.page.Page;
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import java.util.HashSet;
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import java.util.Set;
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public class Statistician {
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private final Set<Page> evaluatedPages;
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private int numberOfIssues;
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private int numberOfPrs;
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private int numberOfExternalLinks;
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private int numberOfErrors;
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private Statistician() {
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this.evaluatedPages = new HashSet<>();
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}
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public static Stats evaluate(Page rootPage) {
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Statistician statistician = new Statistician();
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statistician.evaluateTree(rootPage);
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return statistician.result();
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}
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private void evaluateTree(Page page) {
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if (page instanceof GitHubPage ghPage)
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ghPage.subtree().forEach(this::evaluatePage);
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else
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evaluatePage(page);
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}
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private void evaluatePage(Page page) {
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// TODO
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}
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private Stats result() {
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return new Stats(numberOfIssues, numberOfPrs, numberOfExternalLinks, numberOfErrors);
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}
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public record Stats(int numberOfIssues, int numberOfPrs, int numberOfExternalLinks, int numberOfErrors) { }
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}

‎src/main/java/dev/nipafx/demo/modern/page/ErrorPage.java

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import static java.util.Objects.requireNonNull;
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public record ErrorPage(URI url, Exception ex) {
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public record ErrorPage(URI url, Exception ex) implements Page {
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public ErrorPage {
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requireNonNull(url);

‎src/main/java/dev/nipafx/demo/modern/page/ExternalPage.java

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import static java.util.Objects.requireNonNull;
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public record ExternalPage(URI url, String content) {
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public record ExternalPage(URI url, String content) implements SuccessfulPage {
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public ExternalPage {
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requireNonNull(url);

‎src/main/java/dev/nipafx/demo/modern/page/GitHubIssuePage.java

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import static java.util.Objects.requireNonNull;
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10-
public record GitHubIssuePage(URI url, String content, Set<URI> links, int issueNumber) {
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public record GitHubIssuePage(URI url, String content, Set<Page> links, int issueNumber) implements GitHubPage {
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public GitHubIssuePage {
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requireNonNull(url);

‎src/main/java/dev/nipafx/demo/modern/page/GitHubPage.java

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package dev.nipafx.demo.modern.page;
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import java.util.ArrayList;
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import java.util.LinkedHashSet;
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import java.util.Set;
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import java.util.stream.Stream;
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public sealed interface GitHubPage extends SuccessfulPage permits GitHubIssuePage, GitHubPrPage {
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Set<Page> links();
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12+
default Stream<Page> subtree() {
13+
var subtree = new ArrayList<Page>(Set.of(this));
14+
var upcomingPages = new LinkedHashSet<>(this.links());
15+
16+
while (!upcomingPages.isEmpty()) {
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var nextPage = upcomingPages.removeFirst();
18+
if (!subtree.contains(nextPage) && nextPage instanceof GitHubPage nextGhPage)
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new LinkedHashSet<>(nextGhPage.links())
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.reversed()
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.forEach(upcomingPages::addFirst);
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subtree.add(nextPage);
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}
24+
25+
return subtree.stream();
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}
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}

‎src/main/java/dev/nipafx/demo/modern/page/GitHubPrPage.java

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import static java.util.Objects.requireNonNull;
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10-
public record GitHubPrPage(URI url, String content, Set<URI> links, int prNumber) {
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public record GitHubPrPage(URI url, String content, Set<Page> links, int prNumber) implements GitHubPage {
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public GitHubPrPage {
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requireNonNull(url);

‎src/main/java/dev/nipafx/demo/modern/page/Page.java

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package dev.nipafx.demo.modern.page;
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import java.net.URI;
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public sealed interface Page permits ErrorPage, SuccessfulPage {
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URI url();
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}

‎src/main/java/dev/nipafx/demo/modern/page/SuccessfulPage.java

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package dev.nipafx.demo.modern.page;
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public sealed interface SuccessfulPage extends Page permits ExternalPage, GitHubPage {
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String content();
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}

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