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A generic EventHubs client library for JVM
There is a newer version: 1.0.1
/*******************************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.microsoft.eventhubs.client;

import java.util.concurrent.TimeoutException;
import org.apache.qpid.amqp_1_0.client.LinkDetachedException;
import org.apache.qpid.amqp_1_0.client.Message;
import org.apache.qpid.amqp_1_0.client.Sender;
import org.apache.qpid.amqp_1_0.client.Session;
import org.apache.qpid.amqp_1_0.type.Binary;
import org.apache.qpid.amqp_1_0.type.messaging.Data;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class EventHubSender {

  private static final Logger logger = LoggerFactory.getLogger(EventHubSender.class);

  private final Session session;
  private final String entityPath;
  private final String partitionId;
  private final String destinationAddress;

  private Sender sender;

  public EventHubSender(Session session, String entityPath, String partitionId) {
    this.session = session;
    this.entityPath = entityPath;
    this.partitionId = partitionId;
    this.destinationAddress = getDestinationAddress();
  }
  
  public void send(byte[] data) throws EventHubException {
    try {
      if (sender == null) {
        ensureSenderCreated();
      }

      Binary bin = new Binary(data);
      Message message = new Message(new Data(bin));
      sender.send(message);

    } catch (LinkDetachedException e) {
      logger.error(e.getMessage());

      EventHubException eventHubException = new EventHubException("Sender has been closed");
      throw eventHubException;
    } catch (TimeoutException e) {
      logger.error(e.getMessage());

      EventHubException eventHubException = new EventHubException("Timed out while waiting to get credit to send");
      throw eventHubException;
    } catch (Exception e) {
      logger.error(e.getMessage());
    }
  }

  public void send(String data) throws EventHubException {
    //For interop with other language, convert string to bytes
    send(data.getBytes());
  }

  public void close() {
    try {
      sender.close();
    } catch (Sender.SenderClosingException e) {
      logger.error("Closing a sender encountered error: " + e.getMessage());
    }
  }

  private String getDestinationAddress() {
    if (partitionId == null || partitionId.equals("")) {
      return entityPath;
    } else {
      return String.format(Constants.DestinationAddressFormatString, entityPath, partitionId);
    }
  }

  private synchronized void ensureSenderCreated() throws Exception {
    if (sender == null) {
      sender = session.createSender(destinationAddress);
    }
  }
}