Data transfer in a federated publish/subscribe system

A computer program product, comprising a computer readable hardware storage device having program code stored therein, said program code containing instructions executable by a processor to implement a method for data transfer in a federated publish/subscribe system that comprises the processor, a first message broker, and a second message broker, said method comprising:

• said second message broker transmitting, via the processor, a message A to a first subscribing application and a modified message (A+Δ) to a second subscribing application, wherein the modified message (A+Δ) comprises the message A and an addition Δ to the message A, and wherein the first subscribing application and the second subscribing application are different subscribing applications;
• and
• prior to said transmitting, said second message broker receiving a direct transmission, from the first message broker via the processor, of two messages consisting of the message A and a change message that includes the addition Δ.

A federated publish/subscribe system, comprising a processor, a memory coupled to the processor, a computer readable storage device coupled to the processor, a first message broker, and a second message broker, said storage device containing program code executable by the processor via the memory to implement a method for data transfer in the federated publish/subscribe system, said method comprising:

• said second message broker transmitting, via the processor, a message A to a first subscribing application and a modified message (A+Δ) to a second subscribing application, wherein the modified message (A+Δ) comprises the message A and an addition Δ to the message A, and wherein the first subscribing application and the second subscribing application are different subscribing applications;
• and
• prior to said transmitting, said second message broker receiving a direct transmission, from the first message broker via the processor, of two messages consisting of the message A and a change message that includes the addition Δ.