ApplicationBinder.java

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package org.glassfish.jersey.examples.feedcombiner.binder;

import java.io.InputStream;
import java.util.Properties;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;

import javax.ws.rs.core.GenericType;

import javax.inject.Singleton;

import org.glassfish.jersey.examples.feedcombiner.ApplicationProperties;
import org.glassfish.jersey.examples.feedcombiner.generator.IdGenerator;
import org.glassfish.jersey.examples.feedcombiner.generator.SequenceIdGenerator;
import org.glassfish.jersey.examples.feedcombiner.manager.FeedDataStoreManager;
import org.glassfish.jersey.examples.feedcombiner.manager.FeedTaskFactory;
import org.glassfish.jersey.examples.feedcombiner.manager.FeedTaskFactoryImpl;
import org.glassfish.jersey.examples.feedcombiner.model.CombinedFeed;
import org.glassfish.jersey.examples.feedcombiner.service.CombinedFeedService;
import org.glassfish.jersey.examples.feedcombiner.service.CrudService;
import org.glassfish.jersey.examples.feedcombiner.store.DataStoreObserver;
import org.glassfish.jersey.examples.feedcombiner.store.InMemoryDataStore;
import org.glassfish.jersey.examples.feedcombiner.store.ObservableDataStore;
import org.glassfish.jersey.internal.inject.AbstractBinder;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Petr Bouda (petr.bouda at oracle.com)
 */
public class ApplicationBinder extends AbstractBinder {

    private static final Logger LOG = LoggerFactory.getLogger(ApplicationBinder.class.getName());

    private final Properties properties;

    private final ObservableDataStore datastore;

    private final boolean activeScheduler;

    public ApplicationBinder(ObservableDataStore datastore, String propertiesFileName) {
        this(datastore, propertiesFileName, true);
    }

    public ApplicationBinder(ObservableDataStore datastore, String propertiesFileName, boolean activeScheduler) {
        this.datastore = datastore;
        this.properties = getProperties(propertiesFileName);
        this.activeScheduler = activeScheduler;
    }

    private static Properties getProperties(String path) {
        try (InputStream inputStream = ApplicationBinder.class.getClassLoader().getResourceAsStream(path)) {
            Properties properties = new Properties();
            properties.load(inputStream);
            return properties;
        } catch (Exception e) {
            LOG.warn("Property file '" + path + "' not found in the classpath", e);
        }
        return null;
    }

    @Override
    protected void configure() {
        install(new PropertiesBinder(properties),
                new ResourcePartBinder(datastore));

        if (activeScheduler) {
            install(new SchedulerPartBinder(datastore, properties));
        }
    }

    public static class SchedulerPartBinder extends AbstractBinder {

        private final ObservableDataStore dataStore;

        private final Properties properties;

        public SchedulerPartBinder(ObservableDataStore datastore, Properties properties) {
            this.dataStore = datastore;
            this.properties = properties;
        }

        @Override
        protected void configure() {
            FeedTaskFactory feedTaskFactory = new FeedTaskFactoryImpl(dataStore);

            FeedDataStoreManager dataStoreManager;
            if (properties.containsKey(ApplicationProperties.SCHEDULER_POOL_SIZE)) {
                ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(
                        Integer.parseInt((String) properties.get(ApplicationProperties.SCHEDULER_POOL_SIZE)));
                dataStoreManager = new FeedDataStoreManager(feedTaskFactory, scheduler);
            } else {
                dataStoreManager = new FeedDataStoreManager(feedTaskFactory);
            }

            dataStore.addObserver(dataStoreManager);

            bind(feedTaskFactory)
                    .to(FeedTaskFactory.class);

            bind(dataStoreManager)
                    .to(FeedDataStoreManager.class)
                    .to(DataStoreObserver.class);
        }

    }

    public static class ResourcePartBinder extends AbstractBinder {

        private final InMemoryDataStore datastore;

        public ResourcePartBinder(InMemoryDataStore datastore) {
            this.datastore = datastore;
        }

        @Override
        protected void configure() {
            bind(datastore)
                    .to(InMemoryDataStore.class);

            bind(CombinedFeedService.class)
                    .to(new GenericType<CrudService<CombinedFeed>>() {})
                    .in(Singleton.class);

            bind(SequenceIdGenerator.class)
                    .to(IdGenerator.class)
                    .in(Singleton.class);
        }

    }

    public static class PropertiesBinder extends AbstractBinder {

        private final Properties properties;

        public PropertiesBinder(Properties properties) {
            this.properties = properties;
        }

        @Override
        protected void configure() {
            if (properties != null) {
                for (String name : properties.stringPropertyNames()) {
                    String value = properties.getProperty(name);
                    bind(value).to(String.class).named(name);
                }
            }
        }
    }
}