I have debugged into ActiveMQMessageConsumer.acknowledge
void acknowledge(MessageDispatch md, byte ackType) throws JMSException {
MessageAck ack = new MessageAck(md, ackType, 1);
session.sendAck(ack);
synchronized(deliveredMessages){
deliveredMessages.remove(md);
}
}
1. it seems remove message from deliveredMessages is synchronized
2. session.sendAck(ack);
sendAck(ack,false);
asyncSendPacket(ack);
connection.asyncSendPacket(command);
connection is thread safe, so message.acknowledge is thread-safe?
On Wed, Mar 5, 2014 at 6:09 PM, Noel OConnor <noel.ocon...@gmail.com> wrote:
> Be careful according to the JMS 1.02 spec JMS sessions aren't thread safe
> so I don't recommend taking that approach.
> I haven't used the individual acknowledge so you'll have to check that
> yourself.
>
>
> On Wed, Mar 5, 2014 at 8:46 PM, Li Li <fancye...@gmail.com> wrote:
>
>> If I have one session and a receiver thread. this thread receive ten
>> messages to ten worker thread.
>> each worker thread acknowledge it's message?
>> receiver thread:
>> while(true){
>> Message msg=receiver.receive();
>> put msg to a ConcurrentLinkedList;
>>
>> Worker thread:
>> while(true){
>> Message msg=getMessgeFromLinkedList();
>> process msg;
>> msg.acknowledge();
>> }
>>
>>
>> On Wed, Mar 5, 2014 at 5:08 PM, Noel OConnor <noel.ocon...@gmail.com>
>> wrote:
>> > have you seen ActiveMQSession.INDIVIDUAL_ACKNOWLEDGE
>> >
>> > see
>> >
>> http://activemq.apache.org/maven/apidocs/org/apache/activemq/ActiveMQSession.html#INDIVIDUAL_ACKNOWLEDGE
>> >
>> >
>> > On Wed, Mar 5, 2014 at 6:48 PM, Li Li <fancye...@gmail.com> wrote:
>> >
>> >> hi all,
>> >> I want to process a batch of message using my own priority
>> >> algorithm. But in JMS, I can't acknowledge a single message and can
>> >> only acknowledge a session. So I decide to do it like this:
>> >> 1. Create N(=10000) sessions
>> >> 2. using a thread to manage session acknowledge like:
>> >> for(int i=0;i<N;i++){
>> >> if session acknowledged{
>> >> receive A Message without waiting;
>> >> put this message to my own priority queue;
>> >> }
>> >> }
>> >> 3. using another thread to process my own queue;
>> >> get a message from my own queue;
>> >> process this message;
>> >> get the session of this message;
>> >> acknowledge this session;
>> >>
>> >> because a session will receive only a message a time and it
>> >> will be blocked until this message is processed. I need create many
>> >> sessions(maybe I can make session a pool) . I don't know whether
>> >> activemq can deal with so much session. for a single consumer, I will
>> >> create 10000 session. if I have ten consumers, then 100,000 session be
>> >> created at the same time.
>> >>
>>
