JUnit @rule for starting a RabbitMQ container (based on other rule - see comments)

RabbitContainerRule.java

package rules;

import com.google.common.collect.ImmutableMap;
import org.eclipse.jdt.launching.SocketUtil;

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

/**
 * Created with IntelliJ IDEA.
 * User: moshe
 * Date: 9/29/14
 * Time: 4:02 PM
 */
public class RabbitContainerRule extends DockerContainerRule {


    public static final String RABBIT_CONTAINER_IMAGE_NAME = "kenshoo/rabbitmq";

    public static final String SERVICE_PORT = "RabbitMQServicePort";
    public static final String MANAGEMENT_PORT = "RabbitMQManagementPort";

    static String servicePort = Integer.toString(SocketUtil.findFreePort());
    static String managementPort = Integer.toString(SocketUtil.findFreePort());

    static String externalServicePort = Integer.toString(SocketUtil.findFreePort());
    static String externalManagementPort = Integer.toString(SocketUtil.findFreePort());



    static Map.Entry<String, String> internalPortEntry = new HashMap.SimpleEntry<String, String>(servicePort, externalServicePort);
    static Map.Entry<String, String> externalPortEntry = new HashMap.SimpleEntry<String, String>(managementPort, externalManagementPort);
    static Map<String, Map.Entry<String, String>> portEntryMap = ImmutableMap.of(SERVICE_PORT, internalPortEntry, MANAGEMENT_PORT, externalPortEntry);
    static String[] cmd = new String[] {"-p" + servicePort, "-h" + managementPort} ;

    public RabbitContainerRule() {
        super(RABBIT_CONTAINER_IMAGE_NAME, portEntryMap, cmd);
    }


    public String getRabbitServicePort() {
        return this.getExternalServicePorts().get(SERVICE_PORT);
    }

    public String getRabbitManagementPort() {
        return this.getExternalServicePorts().get(MANAGEMENT_PORT);
    }
}