com.linkedin.pinot.common.restlet.PinotRestletApplication.java Source code

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Here is the source code for com.linkedin.pinot.common.restlet.PinotRestletApplication.java

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/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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 com.linkedin.pinot.common.restlet;

import com.linkedin.pinot.common.restlet.swagger.Paths;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Comparator;
import java.util.TreeSet;
import org.apache.commons.collections.ComparatorUtils;
import org.restlet.Application;
import org.restlet.Restlet;
import org.restlet.resource.ServerResource;
import org.restlet.routing.Router;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Base class for Pinot restlet applications.
 */
public abstract class PinotRestletApplication extends Application {
    private static final Logger LOGGER = LoggerFactory.getLogger(PinotRestletApplication.class);
    private static Router router;

    @Override
    public Restlet createInboundRoot() {
        router = new Router(getContext());
        configureRouter(router);
        return router;
    }

    protected abstract void configureRouter(Router router);

    protected void attachRoutesForClass(Router router, Class<? extends ServerResource> clazz) {
        TreeSet<String> pathsOrderedByLength = new TreeSet<String>(
                ComparatorUtils.chainedComparator(new Comparator<String>() {

                    @Override
                    public int compare(String left, String right) {
                        int leftLength = left.length();
                        int rightLength = right.length();
                        return leftLength < rightLength ? -1 : (leftLength == rightLength ? 0 : 1);
                    }
                }, ComparatorUtils.NATURAL_COMPARATOR));

        for (Method method : clazz.getDeclaredMethods()) {
            Annotation annotationInstance = method.getAnnotation(Paths.class);
            if (annotationInstance != null) {
                pathsOrderedByLength.addAll(Arrays.asList(((Paths) annotationInstance).value()));
            }
        }

        for (String routePath : pathsOrderedByLength) {
            LOGGER.info("Attaching route {} -> {}", routePath, clazz.getSimpleName());
            attachRoute(router, routePath, clazz);
        }
    }

    protected void attachRoute(Router router, String routePath, Class<? extends ServerResource> clazz) {
        router.attach(routePath, createFinder(clazz));
    }

    public static Router getRouter() {
        return router;
    }
}