dnet-hadoop/dhp-common/src/main/java/eu/dnetlib/message/MessageManager.java

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package eu.dnetlib.message;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeoutException;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
public class MessageManager {
private final String messageHost;
private final String username;
private final String password;
private Connection connection;
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private final Map<String, Channel> channels = new HashMap<>();
private boolean durable;
private boolean autodelete;
private final LinkedBlockingQueue<Message> queueMessages;
public MessageManager(
String messageHost,
String username,
String password,
final LinkedBlockingQueue<Message> queueMessages) {
this.queueMessages = queueMessages;
this.messageHost = messageHost;
this.username = username;
this.password = password;
}
public MessageManager(
String messageHost,
String username,
String password,
boolean durable,
boolean autodelete,
final LinkedBlockingQueue<Message> queueMessages) {
this.queueMessages = queueMessages;
this.messageHost = messageHost;
this.username = username;
this.password = password;
this.durable = durable;
this.autodelete = autodelete;
}
private Connection createConnection() throws IOException, TimeoutException {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost(this.messageHost);
factory.setUsername(this.username);
factory.setPassword(this.password);
return factory.newConnection();
}
private Channel createChannel(
final Connection connection,
final String queueName,
final boolean durable,
final boolean autodelete)
throws Exception {
Map<String, Object> args = new HashMap<>();
args.put("x-message-ttl", 10000);
Channel channel = connection.createChannel();
channel.queueDeclare(queueName, durable, false, this.autodelete, args);
return channel;
}
private Channel getOrCreateChannel(final String queueName, boolean durable, boolean autodelete)
throws Exception {
if (channels.containsKey(queueName)) {
return channels.get(queueName);
}
if (this.connection == null) {
this.connection = createConnection();
}
channels.put(queueName, createChannel(this.connection, queueName, durable, autodelete));
return channels.get(queueName);
}
public void close() throws IOException {
channels
.values()
.forEach(
ch -> {
try {
ch.close();
} catch (Exception e) {
// TODO LOG
}
});
this.connection.close();
}
public boolean sendMessage(final Message message, String queueName) throws Exception {
try {
Channel channel = getOrCreateChannel(queueName, this.durable, this.autodelete);
channel.basicPublish("", queueName, null, message.toString().getBytes());
return true;
} catch (Throwable e) {
throw new RuntimeException(e);
}
}
public boolean sendMessage(
final Message message, String queueName, boolean durable_var, boolean autodelete_var)
throws Exception {
try {
Channel channel = getOrCreateChannel(queueName, durable_var, autodelete_var);
channel.basicPublish("", queueName, null, message.toString().getBytes());
return true;
} catch (Throwable e) {
throw new RuntimeException(e);
}
}
public void startConsumingMessage(
final String queueName, final boolean durable, final boolean autodelete) throws Exception {
Channel channel = createChannel(createConnection(), queueName, durable, autodelete);
channel.basicConsume(queueName, false, new MessageConsumer(channel, queueMessages));
}
}