public MessageId() 
{
        this.producerId = new ProducerId();
}

 public MessageId(String messageKey) 
{
        setValue(messageKey);
}

 public MessageId(ProducerInfo producerInfo,
    long producerSequenceId) 
{
        this.producerId = producerInfo.getProducerId();
        this.producerSequenceId = producerSequenceId;
}

 public MessageId(String producerId,
    long producerSequenceId) 
{
        this(new ProducerId(producerId), producerSequenceId);
}

 public MessageId(ProducerId producerId,
    long producerSequenceId) 
{
        this.producerId = producerId;
        this.producerSequenceId = producerSequenceId;
}

 public int compareTo(MessageId other) 
{
        int result = -1;
        if (other != null) {
            result = this.toString().compareTo(other.toString());
        }
        return result;
}

 public MessageId copy() 
{
        MessageId copy = new MessageId(producerId, producerSequenceId);
        copy.key = key;
        copy.brokerSequenceId = brokerSequenceId;
        return copy;
}

 public boolean equals(Object o) 
{
        if (this == o) {
            return true;
        }
        if (o == null || o.getClass() != getClass()) {
            return false;
        }
        MessageId id = (MessageId)o;
        return producerSequenceId == id.producerSequenceId && producerId.equals(id.producerId);
}

 public long getBrokerSequenceId() 
{
        return brokerSequenceId;
}

 public byte getDataStructureType() 
{
        return DATA_STRUCTURE_TYPE;
}

 public ProducerId getProducerId() 
{
        return producerId;
}

 public long getProducerSequenceId() 
{
        return producerSequenceId;
}

 public int hashCode() 
{
        if (hashCode == 0) {
            hashCode = producerId.hashCode() ^ (int)producerSequenceId;
        }
        return hashCode;
}

 public boolean isMarshallAware() 
{
        return false;
}

 public  void setBrokerSequenceId(long brokerSequenceId) 
{
        this.brokerSequenceId = brokerSequenceId;
}

 public  void setProducerId(ProducerId producerId) 
{
        this.producerId = producerId;
}

 public  void setProducerSequenceId(long producerSequenceId) 
{
        this.producerSequenceId = producerSequenceId;
}

 public  void setTextView(String key) 
{
        this.key = key;
}

Sets the transient text view of the message which will be ignored if the message is marshaled on a transport; so is only for in-JVM changes to accommodate foreign JMS message IDs

 public  void setValue(String messageKey) 
{
        key = messageKey;
        // Parse off the sequenceId
        int p = messageKey.lastIndexOf(":");
        if (p  >= 0) {
            producerSequenceId = Long.parseLong(messageKey.substring(p + 1));
            messageKey = messageKey.substring(0, p);
        }
        producerId = new ProducerId(messageKey);
}

Sets the value as a String

 public String toString() 
{
        if (key == null) {
            key = producerId.toString() + ":" + producerSequenceId;
        }
        return key;
}