+/*
+ * Copyright (c) 2019 AT&T Intellectual Property. All rights reserved.
+ *
+ * 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.akraino.validation.ui.config;
+
+import java.lang.reflect.Field;
+import java.util.Comparator;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.PriorityBlockingQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRegistration;
+
+import org.springframework.web.WebApplicationInitializer;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+import org.springframework.web.servlet.DispatcherServlet;
+
+public class AppInitializer implements WebApplicationInitializer {
+
+ private static final int QUEUE_CAPACITY = 500;
+ private static final int EXECUTOR_SIZE = 20; // the number of threads to keep in the pool, even if
+ // they are idle, unless allowCoreThreadTimeOut is
+ // set
+ private static final int EXECUTOR_MAX_SIZE = 20; // the maximum number of threads to allow in the pool
+ private static final int KEEPALIVE_TIME = 20; // when the number of threads is greater than the
+ // core, this is the maximum time that excess idle
+ // threads will wait for new tasks before
+ // terminating.
+ private static final PriorityBlockingQueue<Runnable> BLOCKING_QUEUE =
+ new PriorityBlockingQueue<Runnable>(QUEUE_CAPACITY, new CFRunnableComparator());
+ public static ExecutorService executorService = new ThreadPoolExecutor(EXECUTOR_SIZE,
+ EXECUTOR_MAX_SIZE, KEEPALIVE_TIME, TimeUnit.SECONDS, BLOCKING_QUEUE);
+
+ @Override
+ public void onStartup(ServletContext container) throws ServletException {
+
+ AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
+ ctx.register(AppConfig.class);
+ ctx.setServletContext(container);
+
+ ServletRegistration.Dynamic servlet = container.addServlet("dispatcher", new DispatcherServlet(ctx));
+
+ servlet.setLoadOnStartup(1);
+ servlet.addMapping("/");
+
+ }
+
+ private static class CFRunnableComparator implements Comparator<Runnable> {
+ @Override
+ @SuppressWarnings("unchecked")
+ public int compare(Runnable runnable1, Runnable runnable2) {
+ // T might be AsyncSupply, UniApply, etc., but we want to
+ // compare our original Runnables.
+ return ((Comparable) unwrap(runnable1)).compareTo(unwrap(runnable2));
+ }
+
+ private Object unwrap(Runnable runnable) {
+ try {
+ Field field = runnable.getClass().getDeclaredField("fn");
+ field.setAccessible(true);
+ // NB: For performance-intensive contexts, you may want to
+ // cache these in a ConcurrentHashMap<Class<?>, Field>.
+ return field.get(runnable);
+ } catch (IllegalAccessException | NoSuchFieldException e) {
+ throw new IllegalArgumentException("Couldn't unwrap " + runnable, e);
+ }
+ }
+ }
+
+}