UI initial implementation.

[validation.git] / ui / src / main / java / org / akraino / validation / ui / config / AppInitializer.java

diff --git a/ui/src/main/java/org/akraino/validation/ui/config/AppInitializer.java b/ui/src/main/java/org/akraino/validation/ui/config/AppInitializer.java
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+/*
+ * 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);
+            }
+        }
+    }
+
+}