PulsarLoadReportImpl.java

/**
 * Copyright 2016 Yahoo Inc.
 *
 * 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.yahoo.pulsar.broker.loadbalance.impl;

import java.util.HashMap;
import java.util.Map;

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

import com.fasterxml.jackson.databind.ObjectMapper;
import com.yahoo.pulsar.broker.loadbalance.LoadReport;
import com.yahoo.pulsar.broker.loadbalance.ResourceDescription;
import com.yahoo.pulsar.broker.loadbalance.ResourceUnit;
import com.yahoo.pulsar.broker.loadbalance.ServiceRequest;
import com.yahoo.pulsar.broker.loadbalance.ServiceUnit;
import com.yahoo.pulsar.common.policies.data.loadbalancer.SystemResourceUsage;
import com.yahoo.pulsar.common.util.ObjectMapperFactory;

public class PulsarLoadReportImpl implements LoadReport {

    private static final Logger log = LoggerFactory.getLogger(PulsarLoadReportImpl.class);
    public Map<ServiceUnit, ServiceRequest> requestPerServiceUnit;
    private SimpleResourceUnit resourceUnit = null;
    private PulsarResourceDescription resourceDescription = null;

    private PulsarLoadReportImpl() {
        requestPerServiceUnit = new HashMap<ServiceUnit, ServiceRequest>();
    }

    @Override
    public Map<ServiceUnit, ServiceRequest> getServiceUnitRequests() {
        return requestPerServiceUnit;
    }

    public static LoadReport parse(String loadReportJson) {
        PulsarLoadReportImpl pulsarLoadReport = new PulsarLoadReportImpl();
        ObjectMapper mapper = ObjectMapperFactory.create();
        try {
            com.yahoo.pulsar.common.policies.data.loadbalancer.LoadReport report = mapper.readValue(loadReportJson,
                    com.yahoo.pulsar.common.policies.data.loadbalancer.LoadReport.class);
            SystemResourceUsage sru = report.getSystemResourceUsage();
            String resourceUnitName = report.getName();
            pulsarLoadReport.resourceDescription = new PulsarResourceDescription();
            if (sru.bandwidthIn != null)
                pulsarLoadReport.resourceDescription.put("bandwidthIn", sru.bandwidthIn);
            if (sru.bandwidthOut != null)
                pulsarLoadReport.resourceDescription.put("bandwidthOut", sru.bandwidthOut);
            if (sru.memory != null)
                pulsarLoadReport.resourceDescription.put("memory", sru.memory);
            if (sru.cpu != null)
                pulsarLoadReport.resourceDescription.put("cpu", sru.cpu);
            pulsarLoadReport.resourceUnit = new SimpleResourceUnit(resourceUnitName,
                    pulsarLoadReport.resourceDescription);

        } catch (Exception e) {
            log.warn("Failed Parsing Load Report from JSON string [{}]", e);
        }
        return pulsarLoadReport;
    }

    @Override
    public ResourceUnit getResourceUnit() {
        return resourceUnit;
    }

    @Override
    public ResourceDescription getResourceUnitDescription() {
        return resourceDescription;
    }

}