org.gtri.fhir.api.vistaex.rest.service.servlet.GtVistaRestfulServlet.java Source code

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Here is the source code for org.gtri.fhir.api.vistaex.rest.service.servlet.GtVistaRestfulServlet.java

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/*
 * Copyright 2016 Georgia Tech Research Corporation.
 *
 * 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.gtri.fhir.api.vistaex.rest.service.servlet;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;

import ca.uhn.fhir.context.FhirContext;
import ca.uhn.fhir.context.FhirVersionEnum;
import ca.uhn.fhir.narrative.DefaultThymeleafNarrativeGenerator;
import ca.uhn.fhir.narrative.INarrativeGenerator;
import ca.uhn.fhir.rest.server.EncodingEnum;
import ca.uhn.fhir.rest.server.IResourceProvider;
import ca.uhn.fhir.rest.server.RestfulServer;
import ca.uhn.fhir.rest.server.interceptor.ResponseHighlighterInterceptor;
import org.gtri.fhir.api.vistaex.rest.service.conformance.GtVistaExConformanceProvider;
import org.gtri.fhir.api.vistaex.rest.service.provider.*;
import org.gtri.fhir.api.vistaex.rest.service.util.VistaUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.WebApplicationContext;

/**
 * This servlet is the actual FHIR server itself
 */
public class GtVistaRestfulServlet extends RestfulServer {

    private static final long SESSION_REFRESH_INTERVAL_MILLI = 300000;
    private static final long serialVersionUID = 1L;
    private final static Logger logger = LoggerFactory.getLogger(GtVistaRestfulServlet.class);

    private Timer refreshTimer;
    private SessionRefreshTimer sessionRefreshTimerTask;

    /**
     * Constructor
     */
    public GtVistaRestfulServlet() {
        super(FhirContext.forDstu2()); // Support DSTU2
    }

    /**
     * This method is called automatically when the
     * servlet is initializing.
     */
    @Override
    public void initialize() {

        //Get a handle on the Web Application Context
        WebApplicationContext applicationContext = ContextLoaderListener.getCurrentWebApplicationContext();

        /*
         * Two resource providers are defined. Each one handles a specific
         * type of resource.
         */
        List<IResourceProvider> providers = new ArrayList<IResourceProvider>();
        providers.add(new GtVistaExApiAllergyIntolleranceResourceProvider());
        providers.add(new GtVistaExApiConditionResourceProvider());
        providers.add(new GtVistaExApiEncounterResourceProvider());
        providers.add(new GtVistaExApiMedicationAdministrationResourceProvider());
        providers.add(new GtVistaExApiMedicationOrderResourceProvider());
        providers.add(new GtVistaExApiObservationResourceProvider());
        providers.add(new GtVistaExApiPatientResourceProvider());
        providers.add(new GtVistaExApiProcedureResourceProvider());
        setResourceProviders(providers);

        /*
         * Add custom conformance provider
         */
        GtVistaExConformanceProvider conformanceProvider = new GtVistaExConformanceProvider(this);
        setServerConformanceProvider(conformanceProvider);

        /*
         * Use a narrative generator. This is a completely optional step, 
         * but can be useful as it causes HAPI to generate narratives for
         * resources which don't otherwise have one.
         */
        INarrativeGenerator narrativeGen = new DefaultThymeleafNarrativeGenerator();
        getFhirContext().setNarrativeGenerator(narrativeGen);

        /*
         * This server interceptor causes the server to return nicely
         * formatter and coloured responses instead of plain JSON/XML if
         * the request is coming from a browser window. It is optional,
         * but can be nice for testing.
         */
        registerInterceptor(new ResponseHighlighterInterceptor());

        /*
         * Tells the server to return pretty-printed responses by default
         */
        setDefaultPrettyPrint(true);

        /*
         * Default to JSON and pretty printing
         */
        setDefaultResponseEncoding(EncodingEnum.JSON);

        setFhirContext(new FhirContext((FhirVersionEnum.DSTU2)));

        //log in to Vista Ex API
        VistaUtil.getVistaExResource().loginToVistaEx();

        //start the refresh thread
        sessionRefreshTimerTask = new SessionRefreshTimer();
        refreshTimer = new Timer();
        refreshTimer.schedule(sessionRefreshTimerTask, SESSION_REFRESH_INTERVAL_MILLI,
                SESSION_REFRESH_INTERVAL_MILLI);
    }

    @Override
    public void destroy() {
        super.destroy();
        //log out of Vista Ex API
        VistaUtil.getVistaExResource().logOutOfVistaEx();
    }

}