ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
= Diverting and Splitting Message Flows
:idprefix:
:idseparator: -
Apache ActiveMQ Artemis allows you to configure objects called _diverts_ with some simple server configuration.
Diverts allow you to transparently divert messages routed to one address to one or more other addresses, without making any changes to any client application logic.
2023-12-18 22:02:10 -05:00
Diverts can be _exclusive_ or _non-exclusive_.
An xref:#exclusive-divert[_exclusive_] divert routes messages the new address(es) only.
Messages are not routed to the old address at all.
ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
2023-12-18 22:02:10 -05:00
A xref:#non-exclusive-divert[_non-exclusive_] divert routes messags to the old address and a _copy_ of the messages are also sent to the new address(es).
Think of non-exclusive divert as _splitting_ message flow, e.g. there may be a requirement to monitor every order sent to an order queue.
Multiple diverts can be configured for a single address.
ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
When an address has both exclusive and non-exclusive diverts configured, the exclusive ones are processed first.
If any of the exclusive diverts diverted the message, the non-exclusive ones are not processed.
Diverts can also be configured to have an optional message filter.
If specified then only messages that match the filter will be diverted.
Diverts can apply a particular routing-type to the message, strip the existing routing type, or simply pass the existing routing-type through.
This is useful in situations where the message may have its routing-type set but you want to divert it to an address using a different routing-type.
It's important to keep in mind that a message with the `anycast` routing-type will not actually be routed to queues using `multicast` and vice-versa.
By configuring the `routing-type` of the divert you have the flexibility to deal with any situation.
Valid values are `ANYCAST`, `MULTICAST`, `PASS`, & `STRIP`.
The default is `STRIP`.
Diverts can also be configured to apply a xref:transformers.adoc#transformers[`Transformer`].
If specified, all diverted messages will have the opportunity of being transformed by the `Transformer`.
When an address has multiple diverts configured, all of them receive the same, original message.
This means that the results of a transformer on a message are not directly available for other diverts or their filters on the same address.
See the documentation on xref:using-server.adoc#adding-runtime-dependencies[adding runtime dependencies] to understand how to make your transformer available to the broker.
2023-12-18 22:02:10 -05:00
A divert will only divert a message to an address on the _same server_.
If you want to divert to an address on a different server a common pattern would be to divert to a local "store-and-forward" queue and then set up a xref:core-bridges#core-bridges[bridge] which consumes from that queue and forwards to an address on a different server.
ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
2023-12-18 22:02:10 -05:00
Diverts are therefore a very sophisticated concept which when combined with bridges can be used to create interesting and complex routings.
ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
The set of diverts on a server can be thought of as a type of routing table for messages.
Combining diverts with bridges allows you to create a distributed network of reliable routing connections between multiple geographically distributed servers, creating your global messaging mesh.
Diverts are defined as xml in the `broker.xml` file at the `core` attribute level.
There can be zero or more diverts in the file.
Diverted messages get xref:copied-message-properties.adoc#properties-for-copied-messages[special properties].
2023-12-18 06:58:26 -05:00
Please see the xref:examples.adoc[examples] for a full working example at ./examples/features/standard/divert/ showing you how to configure and use diverts.
ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
2023-12-18 22:02:10 -05:00
Let's take a look at some divert examples...
ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
== Exclusive Divert
Let's take a look at an exclusive divert.
An exclusive divert diverts all matching messages that are routed to the old address to the new address.
Matching messages do not get routed to the old address.
Here's some example xml configuration for an exclusive divert, it's taken from the divert example:
[,xml]
----
<divert name="prices-divert">
<address>priceUpdates</address>
<forwarding-address>priceForwarding</forwarding-address>
<filter string="office='New York'"/>
<transformer-class-name>
org.apache.activemq.artemis.jms.example.AddForwardingTimeTransformer
</transformer-class-name>
<exclusive>true</exclusive>
</divert>
----
We define a divert called `prices-divert` that will divert any messages sent to the address `priceUpdates` to another local address `priceForwarding`.
We also specify a message filter string so only messages with the message property `office` with value `New York` will get diverted, all other messages will continue to be routed to the normal address.
The filter string is optional, if not specified then all messages will be considered matched.
In this example a transformer class is specified without any configuration properties.
Again this is optional, and if specified the transformer will be executed for each matching message.
This allows you to change the messages body or properties before it is diverted.
In this example the transformer simply adds a header that records the time the divert happened.
See the xref:transformers.adoc#transformers[transformer chapter] for more details about transformer-specific configuration.
This example is actually diverting messages to a local store and forward queue, which is configured with a bridge which forwards the message to an address on another ActiveMQ Artemis server.
Please see the example for more details.
== Non-exclusive Divert
Now we'll take a look at a non-exclusive divert.
Non exclusive diverts are the same as exclusive diverts, but they only forward a _copy_ of the message to the new address.
The original message continues to the old address
You can therefore think of non-exclusive diverts as _splitting_ a message flow.
Non exclusive diverts can be configured in the same way as exclusive diverts with an optional filter and transformer, here's an example non-exclusive divert, again from the divert example:
[,xml]
----
<divert name="order-divert">
<address>orders</address>
<forwarding-address>spyTopic</forwarding-address>
<exclusive>false</exclusive>
</divert>
----
2023-12-18 22:02:10 -05:00
The above divert example takes a copy of every message sent to the address `orders` and sends it to a local address called `spyTopic`.
ARTEMIS-4383 migrate user docs to AsciiDoc
Markdown, which is currently used for user-facing documentation, is good
for a lot of things. However, it's not great for the kind of complex
documentation we have and our need to produce both multi-page HTML and
single-page PDF output via Maven.
Markdown lacks features which would make the documentation easier to
read, easier to navigate, and just look better overall.
The current tool-chain uses honkit and a tool called Calibre. Honkit is
written in TypeScript and is installed via NPM. Calibre is a native tool
so it must be installed via an OS-specific package manager. All this
complexity makes building, releasing, uploading, etc. a pain.
AsciiDoc is relatively simple like Markdown, but it has more features
for presentation and navigation not to mention Java-based Maven tooling
to generate both HTML and PDF. Migrating will improve both the
appearance of the documentation as well as the processes to generate and
upload it.
This commit contains the following changes:
- Convert all the Markdown for the User Manual, Migration Guide, and
Hacking guide to AsciiDoc via kramdown [1].
- Update the `artemis-website` build to use AsciiDoctor Maven tooling.
- Update `RELEASING.md` with simplified instructions.
- Update Hacking Guide with simplified instructions.
- Use AsciiDoc link syntax in Artemis Maven doc plugin.
- Drop EPUB & MOBI docs for User Manual as well as PDF for the Hacking
Guide. All docs will be HTML only except for the User Manual which
will have PDF.
- Move all docs up out of their respective "en" directory. This was a
hold-over from when we had docs in different languages.
- Migration & Hacking Guides are now single-page HTML since they are
relatively short.
- Refactor README.md to simplify and remove redundant content.
Benefits of the change:
- Much simplified tooling. No more NPM packages or native tools.
- Auto-generated table of contents for every chapter.
- Auto-generated anchor links for every sub-section.
- Overall more appealing presentation.
- All docs will use the ActiveMQ favicon.
- No more manual line-wrapping! AsciiDoc recommends one sentence per
line and paragraphs are separated by a blank line.
- AsciiDoctor plugins for IDEA are quite good.
- Resulting HTML is less than *half* of the previous size.
All previous links/bookmarks should continue to work.
[1] https://github.com/asciidoctor/kramdown-asciidoc
2023-07-27 23:45:17 -04:00
== Composite Divert
A _composite_ divert is one which forwards messages to multiple addresses.
This pattern is sometimes referred to as _fan-out_.
Configuration is simple.
Just use a comma separated list in `forwarding-address`, e.g.:
[,xml]
----
<divert name="shipping-divert">
<address>shipping</address>
<forwarding-address>dallas, chicago, denver</forwarding-address>
<exclusive>false</exclusive>
</divert>
----
