list-files parallel fix (#1013)

Avoid merging listed files, use a map to store the results of each iteration

Author: romain-grecourt

maven-plugins/stager-maven-plugin/src/it/projects/file/pom.xml

@@ -46,15 +46,26 @@
                                     <file target="docs/4.0.2/index.html"/>
                                     <file target="docs/4.0.2/apidocs/index.html"/>
                                     <file target="docs/4.0.2/images/foo.svg"/>
+                                    <file target="docs/3.2.2/index.html"/>
+                                    <file target="docs/3.2.2/apidocs/index.html"/>
                                 </files>
                                 <symlinks join="true">
                                     <symlink source="docs/4.0.2" target="docs/v4"/>
+                                    <symlink source="docs/3.2.2" target="docs/v3"/>
                                 </symlinks>
                                 <files join="true">
-                                    <file target="sitemap.txt">
-                                        <list-files dir=".">
+                                    <file target="docs/{version}/sitemap.txt">
+                                        <iterators>
+                                            <variables>
+                                                <variable name="version">
+                                                    <value>v3</value>
+                                                    <value>v4</value>
+                                                </variable>
+                                            </variables>
+                                        </iterators>
+                                        <list-files dir="docs/{version}">
                                             <includes>
-                                                <include>**/docs/**/*.html</include>
+                                                <include>**/*.html</include>
                                             </includes>
                                             <excludes>
                                                 <exclude>**/images/**</exclude>

maven-plugins/stager-maven-plugin/src/main/java/io/helidon/build/maven/stager/FileTask.java

@@ -85,7 +85,7 @@ protected void doExecute(StagingContext ctx, Path dir, Map<String, String> vars)
             } else {
                 try (BufferedWriter writer = Files.newBufferedWriter(targetFile)) {
                     for (TextAction task : tasks()) {
-                        writer.write(task.text());
+                        writer.write(task.text(vars));
                     }
                 }
             }

maven-plugins/stager-maven-plugin/src/main/java/io/helidon/build/maven/stager/ListFilesTask.java

@@ -21,6 +21,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.BiFunction;
 
 import io.helidon.build.common.Lists;
@@ -43,7 +44,7 @@ final class ListFilesTask extends StagingTask implements TextAction {
     private final List<Substitution> substitutions;
     private final List<BiFunction<String, Map<String, String>, String>> chain;
     private final String dirName;
-    private final StringBuilder buf = new StringBuilder();
+    private final Map<Map<String, String>, String> results = new ConcurrentHashMap<>();
 
     ListFilesTask(ActionIterators iterators,
                   List<Include> includes,
@@ -60,8 +61,8 @@ final class ListFilesTask extends StagingTask implements TextAction {
     }
 
     @Override
-    public String text() {
-        return buf.toString();
+    public String text(Map<String, String> vars) {
+        return results.getOrDefault(vars, "");
     }
 
     List<String> includes() {
@@ -78,15 +79,17 @@ List<Substitution> substitutions() {
 
     @Override
     protected void doExecute(StagingContext ctx, Path dir, Map<String, String> vars) {
+        StringBuilder sb = new StringBuilder();
         Path resolved = dir.resolve(resolveVar(dirName, vars));
         List<Path> files = walk(resolved, FILE_VISIT_OPTIONS, this::filter);
         for (Path file : files) {
             String entry = normalizePath(dir.relativize(file));
             for (var function : chain) {
                 entry = function.apply(entry, vars);
             }
-            buf.append(entry).append("\n");
+            sb.append(entry).append("\n");
         }
+        results.put(vars, sb.toString());
     }
 
     private boolean filter(Path p, BasicFileAttributes attrs) {

maven-plugins/stager-maven-plugin/src/main/java/io/helidon/build/maven/stager/TextAction.java

@@ -15,6 +15,8 @@
  */
 package io.helidon.build.maven.stager;
 
+import java.util.Map;
+
 /**
  * A {@link StagingAction} that produces text.
  */
@@ -25,5 +27,5 @@ interface TextAction extends StagingAction {
      *
      * @return text
      */
-    String text();
+    String text(Map<String, String> vars);
 }

maven-plugins/stager-maven-plugin/src/test/java/io/helidon/build/maven/stager/ProjectsTestIT.java

@@ -152,13 +152,21 @@ void testFile(String basedir) throws IOException {
         assertThat(stageDir.resolve("docs/v4/apidocs/index.html"), fileExists());
         assertThat(stageDir.resolve("docs/v4/images/foo.svg"), fileExists());
 
-        Path file3 = stageDir.resolve("sitemap.txt");
+        Path file3 = stageDir.resolve("docs/v4/sitemap.txt");
         assertThat(file3, fileExists());
         assertThat(Files.readAllLines(file3), containsInAnyOrder(
                 "docs/v4",
-                "docs/v4/apidocs",
-                "docs/4.0.2",
-                "docs/4.0.2/apidocs"
+                "docs/v4/apidocs"
+        ));
+
+        assertThat(stageDir.resolve("docs/v3/index.html"), fileExists());
+        assertThat(stageDir.resolve("docs/v3/apidocs/index.html"), fileExists());
+
+        Path file4 = stageDir.resolve("docs/v3/sitemap.txt");
+        assertThat(file4, fileExists());
+        assertThat(Files.readAllLines(file4), containsInAnyOrder(
+                "docs/v3",
+                "docs/v3/apidocs"
         ));
     }