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| <id>tag:blogger.com,1999:blog-637417304187784899</id> |
| <updated>2007-12-01T12:33:31.529Z</updated> |
| <title type='text'>James Strachan's Blog</title> |
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| <name>James Strachan</name> |
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| <entry> |
| <id>tag:blogger.com,1999:blog-637417304187784899.post-597595982330434286</id> |
| <published>2007-11-26T08:46:00.000Z</published> |
| <updated>2007-11-26T08:49:10.354Z</updated> |
| <title type='text'>ActiveMQ webinar archive available</title> |
| <content type='html'>Our <a href="http://macstrac.blogspot.com/2007/11/webcast-today-on-apache-activemq.html">previously |
| announced webinar on ActiveMQ</a> is now available on <a |
| href="http://open.iona.com/resources/video-archived-webinars/">IONA's webinar and screencast archive</a>. |
| You can <a href="https://cc.readytalk.com/play?id=go5pfj81">view it here</a>. |
| </content> |
| <link rel='alternate' type='text/html' |
| href='http://macstrac.blogspot.com/2007/11/activemq-webinar-archive-available.html' |
| title='ActiveMQ webinar archive available'/> |
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| href='http://www.blogger.com/comment.g?blogID=637417304187784899&postID=597595982330434286' |
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| <author> |
| <name>James Strachan</name> |
| </author> |
| </entry> |
| <entry> |
| <id>tag:blogger.com,1999:blog-637417304187784899.post-6948835939296895803</id> |
| <published>2007-11-14T14:18:00.001Z</published> |
| <updated>2007-11-14T19:43:38.291Z</updated> |
| <title type='text'>More thoughts on RESTful Message Queues</title> |
| <content type='html'>Just a small follow up on my previous <span style="font-size:100%;"><a |
| style="font-weight: normal;" href="http://macstrac.blogspot.com/2007/08/pure-restful-api-to-activemq-via.html">Pure |
| RESTful API to ActiveMQ via AtomPub</a></span>. AtomPub rocks and all - I was thinking whats the |
| easiest possible RESTful client to subscribe to a message queue.<br /><blockquote></blockquote><blockquote>GET |
| queues/foo.bar?user=myUniqueId&amp;timeout=5000</blockquote>This would activate my subscription to the |
| queue <span style="font-style: italic;">foo.bar</span> (or help to keep it alive) and return my own |
| list of messages as an Atom feed that I am allowed to view and DELETE when I have consumed them.<br /><br |
| />This operation is idempotent and would work great with proxies and caches (assuming the right HTTP headers / |
| ETags stuff) letting clients to keep GETing as often as they like. Though if you don't use the subscription for |
| period of time, your subscription can go stale and timeout; any messages in your message collection could be |
| removed.<br /><br />The slightly smelly thing here is we need to either use cookies (such as for HTTP |
| session handling with servlets) or use a custom session ID header in the URL to uniquely differentiate the |
| subscriptions. Anyone got a better idea?<br /><br />I guess we could demand that clients PUT/POST to |
| get a new Location URL on which to GET their subscriptions; but this would require a custom REST client. |
| </content> |
| <link rel='alternate' type='text/html' |
| href='http://macstrac.blogspot.com/2007/11/more-thoughts-on-restful-message-queues.html' |
| title='More thoughts on RESTful Message Queues'/> |
| <link rel='replies' type='text/html' |
| href='http://www.blogger.com/comment.g?blogID=637417304187784899&postID=6948835939296895803' |
| title='3 Comments'/> |
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| href='http://www.blogger.com/feeds/637417304187784899/posts/default/6948835939296895803'/> |
| <author> |
| <name>James Strachan</name> |
| </author> |
| </entry> |
| <entry> |
| <id>tag:blogger.com,1999:blog-637417304187784899.post-8132857663967818867</id> |
| <published>2007-11-13T15:30:00.000Z</published> |
| <updated>2007-11-13T16:40:47.166Z</updated> |
| <category scheme='http://www.blogger.com/atom/ns#' term='camel'/> |
| <title type='text'>Feedback on my Camel talk at the IJTC conference</title> |
| <content type='html'>Thanks to <a href="http://capedcrusading.blogspot.com/">John</a> for the <a |
| href="http://capedcrusading.blogspot.com/2007/11/ijtc-conference-spring-grails-camel.html">great feedback on my |
| Camel talk</a> (and other talks too). I started to write a huge reply and figured I'd post it here instead |
| then link to it as its easier to reply to different parts.<br /><blockquote>Camel itself is not an ESB |
| per-se, it is a component of an ESB </blockquote>Agreed. The idea is Camel does the routing and <a |
| href="http://activemq.apache.org/camel/enterprise-integration-patterns.html" title="Enterprise Integration |
| Patterns">Enterprise Integration Patterns</a> - you can then use it inside a web service stack like <span |
| class="nobr"></span><a href="http://incubator.apache.org/cxf/" title="Visit page outside Confluence" |
| rel="nofollow">Apache CXF</a>, a message broker like <span style="text-decoration: underline;"></span><span |
| class="nobr"><a href="http://activemq.apache.org/" title="Visit page outside Confluence" rel="nofollow">Apache |
| ActiveMQ</a></span> or an ESB like<span class="nobr"><a |
| href="http://incubator.apache.org/servicemix/" title="Visit page outside Confluence" rel="nofollow"> Apache |
| ServiceMix</a></span><br /><blockquote>1. One of the key messages that came out of the |
| session was how Java-centric the Camel solution is - Strachan went so far as to articulate the view that coding in |
| XML was a fundamentally bad idea.<br /></blockquote>Maybe being the author of <a |
| href="http://commons.apache.org/jelly/">Jelly</a> and hating writing XSLT has made me a bit too sensitive |
| to the idea of programming by XML. Quite a few customers I talk with report frustration of too much XML hacking |
| with Spring (which is being addressed in Guice and Spring 2.5). But heck if you like programming in XML be my |
| guest :)<br /><blockquote>He went on to cast aspersions on graphical tools also. His clear preference |
| was that integration logic should be written in Java. Given that I have worked with highly skilled Java developers |
| for many years now I was not too surprised to hear this - many good developers shy away from tooling, seeing it as |
| compromising their style or the power of the underlying framework - hence the longevity of vi and emacs I suppose.<br |
| /></blockquote>I didn't mean to cast aspersions on graphical tools; more that pretty much all developers |
| understand Java these days, its pretty universal - whereas most complex graphical tools require a fair amount of |
| learning to get used to them.<br /><br />Personally I totally prefer writing in Java rather than XML |
| or using visual tooling but one of the main requirements of Camel is that you can configure and specify routes in |
| any way you like - via a graphical IDE (e.g. Cimero) or via XML or Java or Groovy or Ruby or one day hopefully a |
| real DSL. Using XML is quite useful as you can just drop your routing rules inside a spring XML file such as |
| inside the <span style="text-decoration: underline;"></span><span class="nobr"><a |
| href="http://activemq.apache.org/" title="Visit page outside Confluence" rel="nofollow">Apache ActiveMQ</a></span>.<br |
| /><br />So we're working hard to allow folks to specify routing rules however they like - despite what I |
| prefer :). Irrespective of how you write your routing rules, we can <a |
| href="http://activemq.apache.org/camel/visualisation.html">visualise them</a> so anyone can easily |
| understand them.<br /><blockquote>However it is important to note that all developers are not |
| middleware experts and have no wish to be. Indeed the enterprises they work for want their developers to spend as |
| little time and effort as possible on middleware plumbing. They need and demand tools which will enable them to |
| get at least 80% of patterns done without having to understand the middleware architecture, it's threading model,<br |
| /></blockquote>Thats one of the main things we're trying to attempt with Camel - letting folks who are |
| not middleware experts easily use the <a |
| href="http://activemq.apache.org/camel/enterprise-integration-patterns.html" title="Enterprise Integration |
| Patterns">Enterprise Integration Patterns</a> using a single line of Java code - using <a |
| href="http://activemq.apache.org/camel/components.html">any transport or component </a>with minimal |
| configuration required.<br /><blockquote>it's support for configurable expression languages etc.<br |
| /></blockquote>I find it hard to understand how any tool can be usable by folks without some kind of |
| expression language that they understand - whether its Java or SQL or XPath/XQuery or whatnot. Even a visual query |
| definer is a language that users need to know.<br /><blockquote>Most people express their requirements |
| in a declarative way- I have data at A that needs to get to B, on it's way I need to perform transformation, |
| validation, logging etc. (indeed the EIP book itself does this) . However Camel has taken a very Java centric |
| approach and I think this increases it's complexity unnecessarily.<br /></blockquote>We are actually |
| trying to be as declarative as possible - don't let the fact that you can use Java as the DSL confuse you. e.g. |
| here's what you just described in Camel using a single line of Java code...<br /><blockquote>from(a).<br |
| />to("xsd:org/cheese/something.xsd").<br />to("xslt:com/acme/mytransform.xsl").<br />to("log:com.acme.MyLogger").<br |
| />to(b);<br /></blockquote>Its hard to be more concise than that in Java code. But sure - you could |
| use some other language or XML or UI tool etc<br /><blockquote>2. Camel presents transports as |
| nice-simple looking endpoint URIs in Java. However configuration of these transports may not be as simple as it |
| seems. There appears to me to be a potential disconnection between the Camel processors and the Camel Components |
| in terms of configuration.<br /></blockquote>You can always configure anything in Camel via Java or |
| Spring; a component, endpoint, processor etc. The URI is just a shorthand notation for configurating things; which |
| tends to work well with endpoints as usually all the smart configuration is in the component.<br /><blockquote>In |
| the presentation processors use endpoints which can be configured using Spring within Camel. However it would |
| appear that many of the component implementations are inherited from ServiceMix and these properties will need to |
| be set presumably within the ServiceMix container configuration? </blockquote>Not so - all the components |
| are configured in Spring via Camel. If you want to talk to ServiceMix components and endpoints you can use the NMR |
| and the <a href="http://activemq.apache.org/camel/jbi.html">JBI endpoint</a>.<br /><blockquote>When |
| you have multiple XML configurations to use a transport then the pretty looking URI is hiding a lot of complexity |
| under the hood.<br /></blockquote>I hear you. We've tried very hard to make things as easy as is |
| possible with minimal configuration; for example most configuration tends to be on the Component rather than the |
| Endpoint. But you can configure things however you like in Java code or Guice or Spring.<br /><blockquote>3. |
| Some of the pattern implementations look a little short on credibility - take the aggregator pattern for example |
| the "aggregator" pattern does not seem to have the concept of a store - so in essence one must have access to all |
| of the messages which require aggregation or must hold aggregations in memory for the configurable timeout period. |
| This will clearly not work in a scalable way. Likewise as regards clustering - if you are looking to aggregate 2 |
| messages and they turn up on different servers you gotta problem.</blockquote>You're right I purposely |
| missed out some of the detail on a few slides (such as specifying some kind of persistence store or strategy for |
| aggregator or for idempotent consumer) but that is easily done via a pluggable strategies Spring beans. However |
| just because I missed out some detail on some slides (its kinda hard in an hour to present all the detail in all |
| the patterns as well as the rest of Camel) please don't think that somehow Camel isn't short on capabilities.<br |
| /><blockquote>To summarise Camel is clearly a worthy set of widgets and they will work for very simple |
| applications without Enterprise requirements.<br /></blockquote>Ouch :). We've actually lots of |
| customers using Camel today in production with very Enterprise requirements. <span class="nobr"></span><a |
| href="http://activemq.apache.org/" title="Visit page outside Confluence" rel="nofollow">Apache ActiveMQ</a> |
| 5.0 actually ships <a href="http://activemq.apache.org/enterprise-integration-patterns.html">fully |
| integrated with Camel</a> so we've tons of users in production using Camel today.<br /><br />I |
| hope I've managed to straighten out some misunderstandings on Camel; its definitely a great fit for enterprise |
| requirements. Thanks for your great feedback - I'll definitely take it on board on future presentations and try |
| and avoid confusing other folks :). |
| </content> |
| <link rel='alternate' type='text/html' |
| href='http://macstrac.blogspot.com/2007/11/feedback-on-my-camel-talk-at-ijtc.html' |
| title='Feedback on my Camel talk at the IJTC conference'/> |
| <link rel='replies' type='text/html' |
| href='http://www.blogger.com/comment.g?blogID=637417304187784899&postID=8132857663967818867' |
| title='2 Comments'/> |
| <link rel='replies' type='application/atom+xml' |
| href='http://macstrac.blogspot.com/feeds/8132857663967818867/comments/default' title='Post Comments'/> |
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| href='http://macstrac.blogspot.com/feeds/posts/default/8132857663967818867'/> |
| <link rel='edit' type='application/atom+xml' |
| href='http://www.blogger.com/feeds/637417304187784899/posts/default/8132857663967818867'/> |
| <author> |
| <name>James Strachan</name> |
| </author> |
| </entry> |
| <entry> |
| <id>tag:blogger.com,1999:blog-637417304187784899.post-2980017428692756666</id> |
| <published>2007-11-13T13:33:00.000Z</published> |
| <updated>2007-11-13T13:35:25.014Z</updated> |
| <title type='text'>webcast today on Apache ActiveMQ</title> |
| <content type='html'>Sorry for the really late notice - bad James! - but I<a |
| href="http://open.iona.com/resources/news/#webinar">'m doing a webinar today</a> on <a |
| href="http://activemq.apache.org/">Apache ActiveMQ</a> with my fellow committer <a |
| href="http://hiramchirino.com/index.html">Hiram Chirino</a>. Feel free to pop by and join us - or if |
| you're snowed you can catch the recording later on. |
| </content> |
| <link rel='alternate' type='text/html' |
| href='http://macstrac.blogspot.com/2007/11/webcast-today-on-apache-activemq.html' |
| title='webcast today on Apache ActiveMQ'/> |
| <link rel='replies' type='text/html' |
| href='http://www.blogger.com/comment.g?blogID=637417304187784899&postID=2980017428692756666' |
| title='0 Comments'/> |
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| href='http://macstrac.blogspot.com/feeds/2980017428692756666/comments/default' title='Post Comments'/> |
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| href='http://macstrac.blogspot.com/feeds/posts/default/2980017428692756666'/> |
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| href='http://www.blogger.com/feeds/637417304187784899/posts/default/2980017428692756666'/> |
| <author> |
| <name>James Strachan</name> |
| </author> |
| </entry> |
| <entry> |
| <id>tag:blogger.com,1999:blog-637417304187784899.post-8437027470203977326</id> |
| <published>2007-11-13T13:10:00.000Z</published> |
| <updated>2007-11-13T13:32:23.119Z</updated> |
| <title type='text'>my slides on ActiveMQ and Camel from last weeks Dublin Conference</title> |
| <content type='html'>They are not that useful if you missed me talk, as they are low on bullet points and high on |
| pictures :) But if you were there, here are the slides in PDF format...<br /><ul><li><pre><a |
| href="http://people.apache.org/%7Ejstrachan/talks/ActiveMQ-Dublin07.pdf">ActiveMQ-Dublin07.pdf</a></pre></li><li><pre><a |
| href="http://people.apache.org/%7Ejstrachan/talks/Camel-Dublin07.pdf">Camel-Dublin07.pdf</a> <br /></pre></li></ul></content> |
| <link rel='alternate' type='text/html' |
| href='http://macstrac.blogspot.com/2007/11/my-slides-on-activemq-and-camel-from.html' |
| title='my slides on ActiveMQ and Camel from last weeks Dublin Conference'/> |
| <link rel='replies' type='text/html' |
| href='http://www.blogger.com/comment.g?blogID=637417304187784899&postID=8437027470203977326' |
| title='0 Comments'/> |
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| href='http://macstrac.blogspot.com/feeds/8437027470203977326/comments/default' title='Post Comments'/> |
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| href='http://macstrac.blogspot.com/feeds/posts/default/8437027470203977326'/> |
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| href='http://www.blogger.com/feeds/637417304187784899/posts/default/8437027470203977326'/> |
| <author> |
| <name>James Strachan</name> |
| </author> |
| </entry> |
| <entry> |
| <id>tag:blogger.com,1999:blog-637417304187784899.post-4574479486073739581</id> |
| <published>2007-11-13T13:09:00.000Z</published> |
| <updated>2007-11-13T13:10:23.292Z</updated> |
| <title type='text'>a great presentation on REST, JAX-WS and JSR 311</title> |
| <content type='html'>A great <a |
| href="http://www.innoq.com/blog/st/presentations/2007/2007-11-06-JSR-311-W-JAX.pdf" class="jive-link-external">presentation</a> |
| from <a href="http://www.innoq.com/blog/st/" class="jive-link-external">Stefan Tilkov</a> on REST, |
| JAX-WS and JSR 311; highly recommended. |
| </content> |
| <link rel='alternate' type='text/html' |
| href='http://macstrac.blogspot.com/2007/11/great-presentation-on-rest-jax-ws-and.html' |
| title='a great presentation on REST, JAX-WS and JSR 311'/> |
| <link rel='replies' type='text/html' |
| href='http://www.blogger.com/comment.g?blogID=637417304187784899&postID=4574479486073739581' |
| title='0 Comments'/> |
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| href='http://macstrac.blogspot.com/feeds/4574479486073739581/comments/default' title='Post Comments'/> |
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| href='http://macstrac.blogspot.com/feeds/posts/default/4574479486073739581'/> |
| <link rel='edit' type='application/atom+xml' |
| href='http://www.blogger.com/feeds/637417304187784899/posts/default/4574479486073739581'/> |
| <author> |
| <name>James Strachan</name> |
| </author> |
| </entry> |
| <entry> |
| <id>tag:blogger.com,1999:blog-637417304187784899.post-459928383168678386</id> |
| <published>2007-11-05T10:34:00.000Z</published> |
| <updated>2007-11-05T10:46:07.867Z</updated> |
| <title type='text'>Speaking at the Irish Java Technology Conference on Thursday and Friday</title> |
| <content type='html'>I'll be <a href="http://ijtc.firstport.ie/bio.aspx?sid=33">speaking</a> this week |
| at the <a href="http://ijtc.firstport.ie/"><span id="cmsContent"></span>Irish Java Technology |
| Conference</a> this week on Thursday and Friday. My talks are<br /><ul><li><a |
| href="http://ijtc.firstport.ie/lecture.aspx?lid=34">Enterprise Messaging With Apache ActiveMQ</a></li><li><a |
| href="http://ijtc.firstport.ie/lecture.aspx?lid=14">Easy Enterprise Integration Patterns with Apache Camel, |
| ActiveMQ and ServiceMix</a></li></ul>Do pop along and say hi if you're gonna be in the Dublin |
| area this week. |
| </content> |
| <link rel='alternate' type='text/html' |
| href='http://macstrac.blogspot.com/2007/11/speaking-at-irish-java-technology.html' |
| title='Speaking at the Irish Java Technology Conference on Thursday and Friday'/> |
| <link rel='replies' type='text/html' |
| href='http://www.blogger.com/comment.g?blogID=637417304187784899&postID=459928383168678386' |
| title='3 Comments'/> |
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| <author> |
| <name>James Strachan</name> |
| </author> |
| </entry> |
| </feed> |
