BrokerUsage.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.common.policies.data.loadbalancer;

import java.util.Map;

/**
 * {@link BrokerUsage} object encapsulates the resources that are only used by broker, for now, it's connections both to
 * outside JVM and to the local VM
 *
 */
public class BrokerUsage {
    private long connectionCount;
    private long replicationConnectionCount;

    public long getConnectionCount() {
        return connectionCount;
    }

    public long getReplicationConnectionCount() {
        return replicationConnectionCount;
    }

    public void setConnectionCount(long connectionCount) {
        this.connectionCount = connectionCount;
    }

    public void setReplicationConnectionCount(long replicationConnectionCount) {
        this.replicationConnectionCount = replicationConnectionCount;
    }

    /*
     * factory method that returns an instance of this class populated from metrics we expect the keys that we are
     * looking there's no explicit type checked object which guarantees that we have a specific type of metrics
     *
     * @param metrics metrics object containing the metrics collected per minute from mbeans
     * 
     * @return new instance of the class populated from metrics
     */
    public static BrokerUsage populateFrom(Map<String, Object> metrics) {
        BrokerUsage brokerUsage = null;
        if (metrics.containsKey("brk_conn_cnt")) {
            brokerUsage = new BrokerUsage();
            brokerUsage.connectionCount = ((Long) metrics.get("brk_conn_cnt")).longValue();
        }
        if (metrics.containsKey("brk_repl_conn_cnt")) {
            if (brokerUsage == null)
                brokerUsage = new BrokerUsage();
            brokerUsage.replicationConnectionCount = ((Long) metrics.get("brk_repl_conn_cnt")).longValue();
        }
        return brokerUsage;
    }
}