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package org.apache.james.queue.jms;

import org.apache.activemq.broker.BrokerPlugin;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.plugin.StatisticsBrokerPlugin;
import org.apache.commons.text.RandomStringGenerator;
import org.junit.jupiter.api.extension.AfterAllCallback;
import org.junit.jupiter.api.extension.BeforeAllCallback;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.api.extension.ParameterResolutionException;
import org.junit.jupiter.api.extension.ParameterResolver;

import com.google.common.collect.ImmutableList;

public class BrokerExtension  implements ParameterResolver, BeforeAllCallback, AfterAllCallback {

    public static final String STATISTICS = "Statistics";

    public static String generateRandomQueueName(BrokerService broker) {
        String queueName = new RandomStringGenerator.Builder().withinRange('a', 'z').build().generate(10);
        BrokerExtension.enablePrioritySupport(broker, queueName);
        return queueName;
    }

    private static void enablePrioritySupport(BrokerService aBroker, String queueName) {
        PolicyMap pMap = new PolicyMap();
        PolicyEntry entry = new PolicyEntry();
        entry.setPrioritizedMessages(true);
        entry.setQueue(queueName);
        pMap.setPolicyEntries(ImmutableList.of(entry));
        aBroker.setDestinationPolicy(pMap);
    }

    private final BrokerService broker;

    public BrokerExtension() throws Exception  {
        broker = new BrokerService();
        broker.setPersistent(false);
        broker.setUseJmx(false);
        broker.addConnector("tcp://127.0.0.1:61616");
    }

    @Override
    public void beforeAll(ExtensionContext context) throws Exception {
        if (context.getTags().contains(STATISTICS)) {
            enableStatistics(broker);
        }
        broker.start();
    }

    @Override
    public void afterAll(ExtensionContext context) throws Exception {
        broker.stop();
    }

    private void enableStatistics(BrokerService broker) {
        broker.setPlugins(new BrokerPlugin[]{new StatisticsBrokerPlugin()});
        broker.setEnableStatistics(true);
    }

    @Override
    public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
        return (parameterContext.getParameter().getType() == BrokerService.class);
    }

    @Override
    public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
        return broker;
    }
}
