org.apache.james.transport.mailets.amqp.AmqpRule.java Source code

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Here is the source code for org.apache.james.transport.mailets.amqp.AmqpRule.java

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package org.apache.james.transport.mailets.amqp;

import java.io.IOException;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.apache.james.util.streams.SwarmGenericContainer;
import org.junit.rules.ExternalResource;

import com.google.common.base.Charsets;
import com.google.common.base.Throwables;
import com.jayway.awaitility.Awaitility;
import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.GetResponse;

public class AmqpRule extends ExternalResource {

    private final SwarmGenericContainer rabbitMqContainer;
    private final String exchangeName;
    private final String routingKey;
    private Channel channel;
    private String queueName;
    private Connection connection;
    private String amqpUri;

    public AmqpRule(SwarmGenericContainer rabbitMqContainer, String exchangeName, String routingKey) {
        this.rabbitMqContainer = rabbitMqContainer;
        this.exchangeName = exchangeName;
        this.routingKey = routingKey;
    }

    @Override
    protected void before() throws Throwable {
        amqpUri = "amqp://" + rabbitMqContainer.getIp();
        ConnectionFactory factory = new ConnectionFactory();
        factory.setUri(amqpUri);
        waitingForRabbitToBeReady(factory);
        connection = factory.newConnection();
        channel = connection.createChannel();
        channel.exchangeDeclare(exchangeName, BuiltinExchangeType.DIRECT);
        queueName = channel.queueDeclare().getQueue();
        channel.queueBind(queueName, exchangeName, routingKey);
    }

    public String getAmqpUri() {
        return amqpUri;
    }

    public Optional<String> readContent() throws IOException {
        return readContentAsBytes().map(value -> new String(value, Charsets.UTF_8));
    }

    public Optional<byte[]> readContentAsBytes() throws IOException {
        boolean autoAck = true;
        return Optional.ofNullable(channel.basicGet(queueName, autoAck)).map(GetResponse::getBody);
    }

    @Override
    protected void after() {
        try {
            channel.close();
            connection.close();
        } catch (Exception e) {
            Throwables.propagate(e);
        }
    }

    private void waitingForRabbitToBeReady(ConnectionFactory factory) {
        Awaitility.await().atMost(30, TimeUnit.SECONDS).with().pollInterval(10, TimeUnit.MILLISECONDS)
                .until(() -> isReady(factory));
    }

    private boolean isReady(ConnectionFactory factory) {
        try (Connection connection = factory.newConnection()) {
            return true;
        } catch (IOException | TimeoutException e) {
            return false;
        }
    }
}