net.codestory.http.reload.ReloadingRoutesProvider Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of http Show documentation

This is the simplest fastest full fledged http server we could come up with

There is a newer version: 2.105

/**
 * Copyright (C) 2013 [email protected]
 *
 * 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 net.codestory.http.reload;

import static net.codestory.http.misc.Fluent.*;

import java.net.*;
import java.nio.file.*;
import java.util.*;
import java.util.concurrent.atomic.*;

import net.codestory.http.*;
import net.codestory.http.compilers.CompilerFacade;
import net.codestory.http.io.*;
import net.codestory.http.misc.*;
import net.codestory.http.routes.*;

import org.slf4j.*;

class ReloadingRoutesProvider implements RoutesProvider {
  private final static Logger LOG = LoggerFactory.getLogger(ReloadingRoutesProvider.class);

  private final Env env;
  private final CompilerFacade compiler;
  private final Configuration configuration;
  private final AtomicBoolean dirty;
  private final List classesWatchers;
  private final FolderWatcher appWatcher;

  private RouteCollection routes;

  ReloadingRoutesProvider(Env env, CompilerFacade compiler, Configuration configuration) {
    this.env = env;
    this.compiler = compiler;
    this.configuration = configuration;
    this.dirty = new AtomicBoolean(true);
    this.classesWatchers = of(classpathFolders()).map(path -> new FolderWatcher(path, ev -> dirty.set(true))).toList();
    this.appWatcher = new FolderWatcher(env.appPath(), ev -> dirty.set(true));
  }

  protected List classpathFolders() {
    URL[] urls = ClassPaths.getUrls(Thread.currentThread().getContextClassLoader());
    return of(urls).map(url -> Paths.get(toUri(url))).toList();
  }

  private static URI toUri(URL url) {
    try {
      return url.toURI();
    } catch (URISyntaxException e) {
      throw new IllegalArgumentException("Unable to convert URL to URI: " + url, e);
    }
  }

  @Override
  public synchronized RouteCollection get() {
    if (dirty.get()) {
      LOG.info("Reloading configuration...");

      classesWatchers.forEach(FolderWatcher::ensureStarted);
      appWatcher.ensureStarted();

      routes = new RouteCollection(env, compiler);
      configuration.configure(routes);
      routes.installExtensions();
      routes.addStaticRoutes(false);

      dirty.set(false);
    }

    return routes;
  }
}