SystemInfo.java

package de.otto.edison.status.domain;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import net.jcip.annotations.Immutable;

import java.time.OffsetDateTime;

import static java.time.Duration.between;
import static java.time.OffsetDateTime.now;
import static java.time.format.DateTimeFormatter.ISO_DATE_TIME;

@Immutable
@JsonIgnoreProperties(ignoreUnknown = true)
public class SystemInfo {

    private static final OffsetDateTime START_TIME = now();

    public final String hostname;
    public final int port;

    private SystemInfo(final String hostname, final int port) {
        this.hostname = hostname;
        this.port = port;
    }

    public static SystemInfo systemInfo(final String hostname, final int port) {
        return new SystemInfo(hostname, port);
    }

    public String getHostname() {
        return hostname;
    }

    public String getSystemTime() {
        return now().format(ISO_DATE_TIME);
    }

    public String getSystemStartTime() {
        return START_TIME.format(ISO_DATE_TIME);
    }

    public String getSystemUpTime() {
        final long seconds = between(START_TIME, now()).getSeconds();
        return String.format("%d:%02d:%02d", seconds / 3600, (seconds % 3600) / 60, (seconds % 60));
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        SystemInfo that = (SystemInfo) o;

        if (port != that.port) return false;
        return !(hostname != null ? !hostname.equals(that.hostname) : that.hostname != null);

    }

    @Override
    public int hashCode() {
        int result = hostname != null ? hostname.hashCode() : 0;
        result = 31 * result + port;
        return result;
    }

    @Override
    public String toString() {
        return "SystemInfo{" +
                "hostname='" + hostname + '\'' +
                ", port=" + port +
                '}';
    }
}