org.searsia.web.Search.java Source code

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Here is the source code for org.searsia.web.Search.java

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/*
 * Copyright 2016 Searsia
 *
 * 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.searsia.web;

import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.ws.rs.GET;
import javax.ws.rs.OPTIONS;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Response;

import org.apache.log4j.Logger;
import org.json.JSONObject;

import org.searsia.SearchResult;
import org.searsia.index.SearchResultIndex;
import org.searsia.index.ResourceIndex;
import org.searsia.engine.Resource;
import org.searsia.engine.SearchException;

/**
 * Generates json response for HTTP GET search.
 * 
 * @author Dolf Trieschnigg and Djoerd Hiemstra
 */
@Path("search")
public class Search {

    private final static Logger LOGGER = Logger.getLogger(Search.class);

    private ResourceIndex engines;
    private SearchResultIndex index;

    public Search(SearchResultIndex index, ResourceIndex engines) throws IOException {
        this.engines = engines;
        this.index = index;
    }

    private static final DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");

    private void logQuery(String resourceid, String query) {
        JSONObject r = new JSONObject();
        r.put("time", df.format(new Date()));
        if (resourceid != null)
            r.put("resourceid", resourceid);
        r.put("query", query);
        LOGGER.info(r.toString());
    }

    private void logWarning(String message) {
        JSONObject r = new JSONObject();
        r.put("time", df.format(new Date()));
        r.put("warning", message);
        LOGGER.warn(r.toString());
    }

    @OPTIONS
    public Response options() {
        return Response.status(Response.Status.NO_CONTENT).header("Access-Control-Allow-Origin", "*")
                .header("Access-Control-Allow-Methods", "GET").build();
    }

    @GET
    @Produces(SearchResult.SEARSIA_MIME_ENCODING)
    public Response query(@QueryParam("r") String resourceid, @QueryParam("q") String query) {
        // TODO: also log the outcome of the query
        logQuery(resourceid, query);

        Resource me, engine, mother;
        SearchResult result;
        JSONObject json;
        me = engines.getMyself();
        mother = engines.getMother();
        if (resourceid != null && resourceid.trim().length() > 0 && !resourceid.equals(me.getId())) {
            engine = engines.get(resourceid);
            if (engine == null) { // unknown? ask your mother
                if (mother != null) {
                    try {
                        engine = mother.searchResource(resourceid);
                    } catch (SearchException e) {
                        String message = "Resource not found: @" + resourceid;
                        logWarning(message);
                        return SearsiaApplication.responseError(404, message);
                    }
                }
                if (engine == null) {
                    String message = "Unknown resource identifier: @" + resourceid;
                    logWarning(message);
                    return SearsiaApplication.responseError(404, message);
                }
                engines.put(engine);
            }
            if (query != null && query.trim().length() > 0) {
                try {
                    result = engine.search(query);
                    result.removeResourceRank(); // only trust your mother
                    json = result.toJson(); // first json for response, so
                    result.addQueryResourceRankDate(engine.getId()); // response will not have query + resource
                    index.offer(result); //  maybe do this AFTER the http response is sent:  https://jersey.java.net/documentation/latest/async.html (11.1.1)
                    json.put("resource", engine.toJson());
                    return SearsiaApplication.responseOk(json);
                } catch (Exception e) {
                    String message = "Resource @" + resourceid + " unavailable: " + e.getMessage();
                    logWarning(message);
                    return SearsiaApplication.responseError(503, message);
                }
            } else {
                json = new JSONObject().put("resource", engine.toJson());
                return SearsiaApplication.responseOk(json);
            }
        } else {
            if (query != null && query.trim().length() > 0) {
                try {
                    result = index.search(query);
                } catch (IOException e) {
                    String message = "Service unavailable: " + e.getMessage();
                    logWarning(message);
                    return SearsiaApplication.responseError(503, message);
                }
                if (result.getHits().isEmpty() && mother != null) { // empty? ask mother!
                    try {
                        result = mother.search(query);
                        index.offer(result); // really trust mother
                    } catch (SearchException e) {
                        String message = "Mother not available";
                        logWarning(message);
                    }
                } else { // own results? Do resource ranking.
                    result.scoreResourceSelection(query, engines);
                }
            } else { // no query? Return empty results
                result = new SearchResult();
                result.scoreResourceSelection(query, engines);
            }
            json = result.toJson();
            json.put("resource", engines.getMyself().toJson());
            return SearsiaApplication.responseOk(json);
        }
    }

}