Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2014 Edgar Espina * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.jooby.assets; import com.google.common.base.CaseFormat; import com.google.common.base.Splitter; import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableSet; import com.google.common.io.ByteStreams; import com.google.common.io.Closeables; import com.typesafe.config.Config; import com.typesafe.config.ConfigFactory; import com.typesafe.config.ConfigValue; import static java.util.Objects.requireNonNull; import org.jooby.MediaType; import org.jooby.funzy.Try; import org.jooby.internal.assets.AssetWriter; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.nio.charset.Charset; import java.nio.file.Path; import java.time.Duration; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.LinkedHashSet; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import java.util.function.BiConsumer; import java.util.function.Consumer; import java.util.function.Function; import java.util.function.Predicate; import java.util.stream.Collectors; import java.util.stream.Stream; /** * <h1>Asset compiler</h1> * <p> * Process static files by validate or modify them in some way. * </p> * * @author edgar * @see AssetProcessor * @see Assets * @since 0.11.0 */ public class AssetCompiler { /** The logging system. */ private final Logger log = LoggerFactory.getLogger(getClass()); private final Map<String, List<AssetProcessor>> pipeline; private final List<AssetAggregator> aggregators = new ArrayList<>(); private final Map<String, List<String>> fileset; private final Predicate<String> scripts; private final Predicate<String> styles; private final Config conf; private final Charset charset; private final EngineFactory engineFactory; private ClassLoader loader; private BiConsumer<Integer, Integer> progress; public AssetCompiler(final Config conf) throws Exception { this(AssetClassLoader.classLoader(conf.getClass().getClassLoader()), conf); } public AssetCompiler(final ClassLoader loader, final Config conf) throws Exception { this.loader = loader; this.conf = requireNonNull(conf, "Assets conf is required."); String basedir = conf.hasPath("assets.basedir") ? spath(conf.getString("assets.basedir")) : ""; this.charset = Charset.forName(this.conf.getString("assets.charset")); this.engineFactory = engineFactory(loader); if (this.conf.hasPath("assets.fileset")) { this.fileset = fileset(this.loader, engineFactory, basedir, this.conf, aggregators::add); } else { this.fileset = new HashMap<>(); } this.scripts = predicate(this.conf, ".js", ".coffee", ".ts"); this.styles = predicate(this.conf, ".css", ".scss", ".sass", ".less"); if (this.fileset.size() > 0) { this.pipeline = pipeline(this.loader, engineFactory, this.conf.getConfig("assets")); } else { this.pipeline = Collections.emptyMap(); } } /** * Get all the assets for the provided file set. Example: * * <pre> * assets { * fileset { * home: [home.css, home.js] * } * } * </pre> * * This method returns <code>home.css</code> and <code>home.js</code> for <code>home</code> file * set. If there is no fileset under that name then it returns an empty list. * * @param name Fileset name. * @return List of files or empty list. */ public List<String> assets(final String name) { return fileset.getOrDefault(name, Collections.emptyList()); } /** * @return Returns all the fileset. */ public Set<String> fileset() { return fileset.keySet(); } /** * Iterate over fileset and common path pattern for them. Example: * * <pre> * { * assets { * fileset { * lib: [js/lib/jquery.js], * home: [css/style.css, js/home.js] * } * } * } * </pre> * * This method returns a set with <code>/css/**</code> and <code>/js/**</code> pattern. * * @return Path pattern of the entire fileset. */ public Set<String> patterns() { return patterns(file -> aggregators.stream().noneMatch(it -> it.fileset().contains(file))) .map(v -> "/" + v + "/**").collect(Collectors.toCollection(LinkedHashSet::new)); } /** * Get all the javascript (or derived) for the provided fileset. Example: * * <pre> * { * assets { * fileset { * mypage: [mypage.js, mypage.css] * } * } * } * </pre> * * <p> * This method returns <code>mypage.js</code> for <code>mypage</code> fileset. * </p> * * @param fileset Fileset name. * @return All the scripts for a fileset. */ public List<String> scripts(final String fileset) { return assets(fileset).stream().filter(scripts).collect(Collectors.toList()); } /** * Get all the css files (or derived) for the provided fileset. Example: * * <pre> * { * assets { * fileset { * mypage: [mypage.js, mypage.css] * } * } * } * </pre> * * <p> * This method returns <code>mypage.js</code> for <code>mypage</code> fileset. * </p> * * @param fileset Fileset name. * @return All the scripts for a fileset. */ public List<String> styles(final String fileset) { return assets(fileset).stream().filter(styles).collect(Collectors.toList()); } /** * List all the {@link AssetProcessor} for a distribution (a.k.a. environment). * * @param dist Distribution's name. * @return A readonly list of available {@link AssetProcessor}. */ public List<AssetProcessor> pipeline(final String dist) { List<AssetProcessor> chain = this.pipeline.get(dist); if (chain == null) { log.debug("no pipeline for: {}", dist); return Collections.emptyList(); } return Collections.unmodifiableList(chain); } /** * @return Readonly list of available {@link AssetAggregator}. */ public List<AssetAggregator> aggregators() { return Collections.unmodifiableList(aggregators); } /** * Build assets using the given distribution and write output to the provided directory. * * Build process is defined as follow: * * 1. First, it runs all the aggregators (if any) * 2. Then iterates each fileset and per each file in the fileset it apply the processor pipeline. * 3. Finally, it merge all the files into one file and compressed/optimized if need it. * * @param dist Distribution's name (usually dev or dist). * @param dir Output directory. * @return Map with fileset name as key and list of generated assets. * @throws Exception If something goes wrong. */ public Map<String, List<File>> build(final String dist, final File dir) throws Exception { log.debug("{} aggregators: {}", dist, aggregators); aggregators(aggregators, conf); return buildInternal(dist, dir); } private Map<String, List<File>> buildInternal(final String dist, final File dir) throws Exception { Map<String, List<File>> output = new LinkedHashMap<>(); List<AssetProcessor> pipeline = pipeline(dist); Set<String> processed = new HashSet<>(); Predicate<String> shouldProcess = dist.equals("dev") ? processed::add : path -> true; int total = fileset.values().stream().mapToInt(List::size).sum(); int count = 0; log.debug("{} pipeline: {}", dist, pipeline); for (Entry<String, List<String>> entries : fileset.entrySet()) { String fset = entries.getKey(); List<String> files = entries.getValue(); log.debug("compiling {}:", fset); /** CSS: */ AssetWriter css = new AssetWriter(dist, fset, dir, ".css", "", charset, this.fileset, styles); count += compile(pipeline, files.stream().filter(styles).iterator(), MediaType.css, css, shouldProcess, count, total); List<File> result = new ArrayList<>(css.getResult()); /** JavaScript: */ AssetWriter js = new AssetWriter(dist, fset, dir, ".js", ";", charset, this.fileset, scripts); count += compile(pipeline, files.stream().filter(scripts).iterator(), MediaType.js, js, shouldProcess, count, total); result.addAll(js.getResult()); result.forEach(it -> log.debug("{} {} ({})", it.getName(), humanReadableByteCount(it.length()), it)); output.put(fset, result); } return output; } private void aggregators(final List<AssetAggregator> aggregators, final Config conf) throws Exception { for (AssetAggregator it : aggregators) { log.debug("applying {}", it); it.run(conf); } } /** * Apply the processor pipeline to the given asset. Like {@link #build(String, File)} but for a * single file or asset. * * @param filename Asset to build. * @return Processed asset. * @throws Exception If something goes wrong. */ public File buildOne(String filename, File dir) throws Exception { String dist = "dev"; final MediaType type; AssetWriter writer; if (scripts.test(filename)) { type = MediaType.js; writer = new AssetWriter(dist, null, dir, ".js", ";", charset, this.fileset, scripts); } else if (styles.test(filename)) { type = MediaType.css; writer = new AssetWriter(dist, null, dir, ".css", "", charset, this.fileset, styles); } else { return null; } List<AssetProcessor> pipeline = pipeline(dist); compile(pipeline, ImmutableList.of(filename).iterator(), type, writer, path -> true, 0, 0); return new File(dir, filename); } /** * Print a summary of the given results. * * @param result Compilation result. * @param outDir Output directory. * @param dist Distribution (dev or prod). * @param duration Execution time in millis. * @param extraInfo Additional information. * @return Summary. */ public String summary(Map<String, List<File>> result, Path outDir, String dist, long duration, String... extraInfo) { StringBuilder buffer = new StringBuilder(); buffer.append("Summary:\n"); long seconds = Duration.ofMillis(duration).getSeconds(); String took = seconds > 0 ? seconds + "s" : duration + "ms"; buffer.append("Pipeline: ").append(pipeline(dist)).append("\n"); buffer.append("Time: ").append(took).append("\n"); buffer.append("Output: ").append(outDir).append("\n"); Stream.of(extraInfo).forEach(line -> buffer.append(line).append("\n")); int w1 = result.keySet().stream().map(it -> it.length() + 2).max(Integer::compareTo).orElse(0); int mw1 = Math.max(w1, "Fileset".length() + 2); int w2 = result.values().stream().flatMap(List::stream) .map(file -> outDir.relativize(file.toPath()).toString()).map(String::length) .max(Integer::compareTo).orElse(0); buffer.append(format(w1, w2, "Fileset", "Output", "Size")); result.forEach((fileset, files) -> { if (files.size() > 0) { // Head buffer.append(format(mw1, w2, " " + fileset, "", "")); // Tail files.forEach(file -> buffer.append(format(mw1, w2, "", outDir.relativize(file.toPath()), AssetCompiler.humanReadableByteCount(file.length())))); } }); return buffer.toString(); } private static String format(int w1, int w2, Object... args) { return String.format("%-" + w1 + "s %" + w2 + "s %10s\n", args); } @Override public String toString() { return fileset.toString(); } public void stop() { if (engineFactory != null) { this.engineFactory.release(); } } /** * Set a progress bar. * * @param progress Progress bar. */ public void setProgressBar(BiConsumer<Integer, Integer> progress) { this.progress = progress; } private Stream<String> patterns(final Predicate<String> filter) { return fileset.values().stream().flatMap(List::stream).filter(filter).map(path -> path.split("/")[1]); } private int compile(final List<AssetProcessor> pipeline, final Iterator<String> files, final MediaType type, final AssetWriter writer, Predicate<String> process, int progress, int total) throws Exception { int count = 0; while (files.hasNext()) { String file = files.next(); if (process.test(file)) { String chunk = compile(pipeline, file, type, readFile(loader, file, charset)); writer.write(file, chunk); } else { writer.add(file); } count += 1; if (this.progress != null) { this.progress.accept(progress + count, total); } } return count; } private String compile(final List<AssetProcessor> pipeline, final String filename, final MediaType type, final String input) throws Exception { log.debug(" {}", filename); Iterator<AssetProcessor> it = pipeline.iterator(); String output = input; while (it.hasNext()) { AssetProcessor processor = it.next(); if (processor.matches(type) && !processor.excludes(filename)) { String pname = processor.name(); long start = System.currentTimeMillis(); try { log.debug(" executing: {}", pname); output = processor.process(filename, output, conf, loader); } finally { long end = System.currentTimeMillis(); log.debug(" {} took {}ms", pname, end - start); } } } return output; } private static String readFile(final ClassLoader loader, final String path, final Charset charset) throws IOException { String spath = path.startsWith("/") ? path.substring(1) : path; InputStream resource = loader.getResourceAsStream(spath); if (resource == null) { throw new FileNotFoundException(path); } return toString(resource, charset); } private static String toString(final InputStream in, final Charset charset) throws IOException { try { return new String(ByteStreams.toByteArray(in), charset); } finally { Closeables.closeQuietly(in); } } private static Predicate<String> predicate(final Config fileset, final String... extension) { String path = "assets" + extension[0]; Set<String> extensions = new HashSet<>(Arrays.asList(extension)); if (fileset.hasPath(path)) { extensions.addAll(strlist(fileset.getAnyRef(path))); } return file -> { for (String ext : extensions) { if (file.endsWith(ext)) { return true; } } return false; }; } private static Map<String, List<String>> fileset(final ClassLoader loader, final EngineFactory engineFactory, final String basedir, final Config conf, final Consumer<AssetAggregator> aggregators) { Map<String, List<String>> raw = new HashMap<>(); Map<String, List<String>> graph = new HashMap<>(); Config assetconf = conf.getConfig("assets"); Config fileset = assetconf.getConfig("fileset"); // 1st pass, collect single resources (no merge) fileset.entrySet().forEach(e -> { List<String> key = Splitter.on('<').trimResults().omitEmptyStrings().splitToList(unquote(e.getKey())); List<String> candidates = strlist(e.getValue().unwrapped(), v -> basedir + spath(v)); List<String> values = new ArrayList<>(); candidates.forEach(it -> Try .run(() -> processors(assetconf, loader, engineFactory, null, ImmutableList.of(it.substring(1)), ImmutableSet.of()).stream().filter(AssetAggregator.class::isInstance).forEach(p -> { AssetAggregator a = (AssetAggregator) p; aggregators.accept(a); a.fileset().forEach(f -> values.add(spath(f))); })) .onFailure(x -> values.add(it))); raw.put(key.get(0), values); graph.put(key.get(0), key); }); Map<String, List<String>> resolved = new HashMap<>(); graph.forEach((fs, deps) -> resolve(fs, deps, raw, graph, resolved)); return resolved; } private static List<String> resolve(final String fs, final List<String> deps, final Map<String, List<String>> raw, final Map<String, List<String>> graph, final Map<String, List<String>> resolved) { List<String> result = resolved.get(fs); if (result == null) { result = new ArrayList<>(); resolved.put(fs, result); for (int i = deps.size() - 1; i > 0; i--) { result.addAll(resolve(deps.get(i), graph.get(deps.get(i)), raw, graph, resolved)); } result.addAll(raw.get(fs)); } return result; } private static String unquote(final String key) { return key.replace("\"", ""); } private static Map<String, List<AssetProcessor>> pipeline(final ClassLoader loader, final EngineFactory engineFactory, final Config conf) throws Exception { Map<String, List<AssetProcessor>> processors = new HashMap<>(); processors.put("dev", Collections.emptyList()); if (conf.hasPath("pipeline")) { Set<String> filter = conf.getConfig("pipeline").entrySet().stream().map(Entry::getKey) .collect(Collectors.toSet()); filter.add("class"); Set<Entry<String, ConfigValue>> entrySet = conf.getConfig("pipeline").entrySet(); for (Entry<String, ConfigValue> entry : entrySet) { String env = unquote(entry.getKey()); processors.put(env, processors(conf, loader, engineFactory, env, strlist(entry.getValue().unwrapped()), filter)); } } return processors; } @SuppressWarnings("unchecked") private static <T extends AssetOptions> List<T> processors(final Config conf, final ClassLoader loader, final EngineFactory engineFactory, final String env, final List<String> names, final Set<String> filter) throws Exception { Map<String, Class<AssetOptions>> classes = new LinkedHashMap<>(); for (Entry<String, String> entry : bind(conf, names).entrySet()) { classes.put(entry.getKey(), (Class<AssetOptions>) loader.loadClass(entry.getValue())); } return (List<T>) processors(conf, loader, engineFactory, env, filter, classes); } @SuppressWarnings("unchecked") private static <T extends AssetOptions> List<T> processors(final Config conf, final ClassLoader loader, final EngineFactory engineFactory, final String env, final Set<String> filter, final Map<String, Class<T>> classes) throws Exception { List<T> processors = new ArrayList<>(); Function<Config, Config> without = options -> { for (String path : filter) { options = options.withoutPath(path); } return options; }; for (Entry<String, Class<T>> entry : classes.entrySet()) { String name = entry.getKey(); Class<T> clazz = entry.getValue(); Config options = ConfigFactory.empty(); if (conf.hasPath(name)) { options = conf.getConfig(name); if (env != null && options.hasPath(env)) { options = options.getConfig(env).withFallback(options); } } AssetOptions processor = clazz.newInstance(); processor.set(without.apply(options)); processors.add((T) processor); if (processor instanceof AssetProcessor) { ((AssetProcessor) processor).set(engineFactory); } } return processors; } private static EngineFactory engineFactory(ClassLoader loader) throws Exception { try { return (EngineFactory) loader .loadClass(System.getProperty("assets.engine", "org.jooby.assets.V8EngineFactory")) .newInstance(); } catch (ClassNotFoundException e) { // Ignore: return null; } } private static Map<String, String> bind(final Config conf, final List<String> names) { Map<String, String> map = new LinkedHashMap<>(); names.forEach(name -> { String clazz = AssetCompiler.class.getPackage().getName() + "." + CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, name); if (conf.hasPath(name + ".class")) { clazz = conf.getString(name + ".class"); } map.put(name, clazz); }); return map; } private static List<String> strlist(final Object value) { return strlist(value, v -> v); } @SuppressWarnings("unchecked") private static List<String> strlist(final Object value, final Function<String, String> mapper) { ImmutableList.Builder<String> list = ImmutableList.builder(); if (value instanceof Collection) { ((Collection<? extends String>) value).forEach(v -> list.add(mapper.apply(v))); } else { list.add(mapper.apply(value.toString())); } return list.build(); } private static String spath(final String path) { return path.charAt(0) == '/' ? path : "/" + path; } // http://stackoverflow.com/questions/3758606/how-to-convert-byte-size-into-human-readable-format-in-java static String humanReadableByteCount(final long bytes) { int unit = 1024; if (bytes < unit) { return bytes + "b"; } int exp = (int) (Math.log(bytes) / Math.log(unit)); char pre = "kmgtpe".charAt(exp - 1); return String.format("%.1f%sb", bytes / Math.pow(unit, exp), pre); } }