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Figure 1A – Mesh (example) Figure 1B – Tree (example)

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Figure 2 – trail system (example)

Figure 3A

Local node in continuum #2 subscribes to subject 23 from continuum #3. (Assume this is the first subscriber for this subject from this domain)

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Figure 3B

Local node in continuum #2 subscribes to subject 23 from continuum #3. (Assume this is the first subscriber for this subject from this domain)

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Figure 4A

Local node in continuum #1 subscribes to subject 23 from continuum #3. (There is already a subscriber in continuum #2)

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After

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Figure 4B

Local node in continuum #4 subscribes to subject 23 from continuum #3. (There is already a subscriber in continuum #2)

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Figure 5A

Local node in continuum #2 cancels subscription to subject 23 from continuum #3. (There is still a subscriber in continuum #1)

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Figure 5B

Local node in continuum #2 cancels subscription to subject 23 from continuum #3. (There is still a subscriber in continuum #4)

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Mesh Tree

Figure 6

New continuum is added to the RAMS Network Node in continuum #1 has subscribed to subject 23 from “all continua”

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Figure 7

Using the SCS to establish a trail system (mesh network)

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Step 1 Step 2 Step 3

Step 1 – A local node in continuum #2 asserts a subscription for subject 23 from continua #3.

Step 2 – Gateway #2 receives the assertion, adds the local node to its DNS, and calculates the required SCS. Citing rule 1a, it adds gateway #3 to its SCS and sends an assertion.

Step 3 – Gateway #3 receives the assertion, adds gateway #2 to its DGS, and calculates the required SCS. Citing rule 2, it adds its own continuum (#3) to the SCS and issues a local subscription assertion.

The resulting trail system is a single trail that goes from publishers in continuum #3 to gateway #3 to gateway #2 to the subscriber in continuum #2. Note that trails are established in a direction that leads from subscribers to publishers, and then traveled in the reverse direction to publish messages.

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Figure 8

Using the SCS to establish a trail system (tree network)

Step 1

Step 1 – A local node in continuum #2 asserts a subscription for subject 23 from continua #3.

Step 2 – Gateway #2 receives the assertion, adds the local node to its DNS, and calculates the required SCS. Citing rule 1a, it adds gateway #1 to its SCS and sends an assertion.

Step 3 – Gateway #1 receives the assertion, adds gateway #2 to its DGS, and calculates the required SCS. Citing rule 3a, it adds gateway #3 to the SCS.

Step 4 – Gateway #3 receives the assertion, adds gateway #1 to its DGS, and calculates the required SCS. Citing rule 2, it adds its own continuum (#3) to the SCS and issues a local subscription assertion.

The resulting trail system is a single trail that goes from publishers in continuum #3 to gateway #3 to gateway #1 to gateway #2 to the subscriber in continuum #2.

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Step 4

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Figure 9

A local node in continuum #2 has subscribed to subject 23 from “all continua”.

Correct trail system

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Incorrect trail system

Figure 10

Removing a gateway from a network

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A) Removing a leaf gateway results in a smaller network

B) Removing a non-leaf gateway splits a single network into multiple smaller networks (in this case, two smaller networks).