/*
 * Copyright (c) 2012-2013 EMC Corporation
 * All Rights Reserved
 */
package com.emc.storageos.processmonitor;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.emc.storageos.db.client.model.ProcessMonitorMetrics;

public class ProcessMonitor implements Runnable {
    private static final Logger _logger = LoggerFactory.getLogger(ProcessMonitor.class);
    private long _megaByteConverter = 1024 * 1024;

    private static final DateTimeFormatter dateFormatter =
            DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss.SSS z");
    private ProcessMonitorMetrics usageMetrics;

    public ProcessMonitor(ProcessMonitorMetrics usgMetrics) {
        usageMetrics = usgMetrics;
    }

    @Override
    public void run() {
        try {
            extractMemoryUsage();
            _logger.info(usageMetrics.toString());
        } catch (Exception e) {
            _logger.error("Process Monitoring Collection failed :", e);
        }
    }

    public void extractMemoryUsage() {
        final Runtime runTime = Runtime.getRuntime();
        long totalMemory = runTime.totalMemory();
        long freeMemory = runTime.freeMemory();
        long maxMemory = runTime.maxMemory();
        long usedMemory = totalMemory - freeMemory;
        long timeCollected = System.currentTimeMillis();
        usageMetrics.setTotalMemory(convertToMB(totalMemory));
        usageMetrics.setFreeMemory(convertToMB(freeMemory));
        usageMetrics.setMaxMemory(convertToMB(maxMemory));
        usageMetrics.setUsedMemory(convertToMB(usedMemory));
        usageMetrics.setTimeCollected(timeCollected);
        if (usageMetrics.getUsedMemory() > usageMetrics.getMaxUsedMemory()) {
            usageMetrics.setMaxUsedMemory(usageMetrics.getUsedMemory());
            usageMetrics.setTimeCollectedMaxUsedMemory(dateFormatter.print(timeCollected));
        }
    }

    public long convertToMB(final long value) {
        return value / _megaByteConverter;

    }
}