How to schedule your task for later execution? You often create table in database, configure job that checks if due time of any task occured and then execute it.<\/p>\n
But there is easier way if only you have message broker with your application… You could publish\/send your message and tell it that it should be delivered with specified delay.<\/p>\n
ActiveMQ<\/a> is open source message broker written in Java. It is implementation of JMS (Java Message Service).<\/p>\n You could start its broker with scheduling support by adding flag <\/p>\n Now, if you want to delay receiving message by few seconds, you could add property during message creation, e.g.:<\/p>\n Delay unit is miliseconds.<\/p>\n Of course queue must be persisted.<\/p>\n When you listen for message on the same queue, then you will see that message indeed will be received with 8 second delay.<\/p>\nschedulerSupport<\/code> to broker configuration:<\/p>\n<beans ...>\r\n ...\r\n <broker xmlns=\"http:\/\/activemq.apache.org\/schema\/core\"\r\n brokerName=\"localhost\"\r\n dataDirectory=\"${activemq.data}\"\r\n schedulerSupport=\"true\">\r\n ...\r\n <\/broker>\r\n ...\r\n<\/beans><\/pre>\nmessage.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, 8000)<\/pre>\n
...\r\nSend time: Tue Dec 01 18:51:23 CET 2015\r\n...\r\nMessage received at Tue Dec 01 18:51:31 CET 2015\r\n...<\/pre>\n
Scheduling messages using RabbitMQ<\/h2>\n