edu.nwpu.gemfire.monitor.service.SystemAlertsService.java Source code

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Here is the source code for edu.nwpu.gemfire.monitor.service.SystemAlertsService.java

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/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 edu.nwpu.gemfire.monitor.service;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

import edu.nwpu.gemfire.monitor.data.Cluster;
import edu.nwpu.gemfire.monitor.data.Repository;
import edu.nwpu.gemfire.monitor.util.StringUtils;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletRequest;

/**
 * Class SystemAlertsService
 * 
 * This class contains implementations of getting system's alerts details (like
 * errors, warnings and severe errors).
 * 
 * @author Anchal G
 * @since version 7.5
 */

@Component
@Service("SystemAlerts")
@Scope("singleton")
public class SystemAlertsService implements PulseService {

    private static final ObjectMapper mapper = new ObjectMapper();

    public ObjectNode execute(final HttpServletRequest request) throws Exception {

        // get cluster object
        Cluster cluster = Repository.get().getCluster();

        // json object to be sent as response
        ObjectNode responseJSON = mapper.createObjectNode();

        JsonNode requestDataJSON = mapper.readTree(request.getParameter("pulseData"));
        int pageNumber = 1; // Default
        String strPageNumber = requestDataJSON.get("SystemAlerts").get("pageNumber").textValue();
        if (StringUtils.isNotNullNotEmptyNotWhiteSpace(strPageNumber)) {
            try {
                pageNumber = Integer.valueOf(strPageNumber);
            } catch (NumberFormatException e) {
            }
        }

        // cluster's Members
        responseJSON.put("systemAlerts", getAlertsJson(cluster, pageNumber));
        responseJSON.put("pageNumber", cluster.getNotificationPageNumber());
        responseJSON.put("connectedFlag", cluster.isConnectedFlag());
        responseJSON.put("connectedErrorMsg", cluster.getConnectionErrorMsg());

        // Send json response
        return responseJSON;
    }

    /**
     * function used for getting all members details in format of JSON Object
     * array defined under a cluster
     * 
     * @param cluster
     * @return JSONObject Array list
     */
    public static ObjectNode getAlertsJson(Cluster cluster, int pageNumber) {
        // getting list of all types of alerts
        Cluster.Alert[] alertsList = cluster.getAlertsList();

        // create alerts json
        ObjectNode alertsJsonObject = mapper.createObjectNode();

        if ((alertsList != null) && (alertsList.length > 0)) {
            ArrayNode errorJsonArray = mapper.createArrayNode();
            ArrayNode severeJsonArray = mapper.createArrayNode();
            ArrayNode warningJsonArray = mapper.createArrayNode();
            ArrayNode infoJsonArray = mapper.createArrayNode();

            cluster.setNotificationPageNumber(pageNumber);
            for (Cluster.Alert alert : alertsList) {
                ObjectNode objAlertJson = mapper.createObjectNode();
                objAlertJson.put("description", alert.getDescription());
                objAlertJson.put("memberName", alert.getMemberName());
                objAlertJson.put("severity", alert.getSeverity());
                objAlertJson.put("isAcknowledged", alert.isAcknowledged());
                objAlertJson.put("timestamp", alert.getTimestamp().toString());
                objAlertJson.put("iso8601Ts", alert.getIso8601Ts());
                objAlertJson.put("id", alert.getId());

                if (alert.getSeverity() == Cluster.Alert.SEVERE) {
                    severeJsonArray.add(objAlertJson);
                } else if (alert.getSeverity() == Cluster.Alert.ERROR) {
                    errorJsonArray.add(objAlertJson);
                } else if (alert.getSeverity() == Cluster.Alert.WARNING) {
                    warningJsonArray.add(objAlertJson);
                } else {
                    infoJsonArray.add(objAlertJson);
                }
            }
            alertsJsonObject.put("info", infoJsonArray);
            alertsJsonObject.put("warnings", warningJsonArray);
            alertsJsonObject.put("errors", errorJsonArray);
            alertsJsonObject.put("severe", severeJsonArray);
        }
        return alertsJsonObject;
    }
}