Re: [ecf-dev] Remote service Restlet example question

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Re: [ecf-dev] Remote service Restlet example question

From: alans@xxxxxxxx
Date: Fri, 10 Aug 2012 10:25:43 -0600
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Hi Scott,

Thank you for the timely reply, it was very helpful. My comments are in-line below.

Kind regards,

-Alan

On Aug 23, 2012, at 9:06 PM, Scott Lewis wrote:

Hi Alan,

One possibility is that the hostname has to be set on the server/service host (it currently defaults to 'localhost'...and it doesn't sound like this is right for your environment). This can be set with the following system property (e.g. given on the command line):

-Dorg.eclipse.ecf.remoteservice.restlet.exporturl.host=my.hostname.com

Note that there are others...with these as defaults:

-Dorg.eclipse.ecf.remoteservice.restlet.exporturl.protocol=http
-Dorg.eclipse.ecf.remoteservice.restlet.exporturl.port=8080

You might try setting these on the server/service host process.

BTW...have you tried running both the server/service host and the consumer on the same system (localhost)? If localhost works but separate hosts do not, then it very likely is an issue with the server hostname as described above.

[Alan] So far I have only run on a single system, Mac OS X, by way of localhost. As a result I believe that I am benefitting from all of the default settings.

Another possibility is that this example uses the zeroconf discovery provider (org.eclipse.ecf.provider.jmdns bundle), and it's quite possible that the network you are on does not support the zeroconf protocol. I suspect that this could also be why your service is not being discovered.

[Alan] Good catch. I run Mac OS X 10.6. I have verified that mDNSResponder is up and running. What is strange is that the host service appears to be available according to the OSGi console, but the Bonjour Browser does not list it. I wonder if there is some incompatibility between osgi-enabled-jmdns and Bonjour on the Mac? Probably something really simple that I am just missing. To the best of my knowledge I've not had multicast difficulties before (we use multicast for grid development), but I can look into this further.

[Alan] That said, I think that I will turn my attention toward the xml-file (EDEF?) based approach so as not to be constrained by either multicast or proximity between host and consumer (the assumption being that the xml-file based approach would work well for service discovery over a WAN or the I-Net?).

In any case...I've been meaning to create another example...that uses some other discovery provider (e.g. the xml-file based provider so that no requirements needed for network support...as various networks allow/disallow the multicast traffic used by zeroconf and other network discovery protocols. If you would like such an example, please open an enhancement request to that effect and we'll start down that road.

[Alan] That would be very helpful. I submitted this enhancement request as Bug 387031. If I did this incorrectly or incompletely please let me know.

[Alan] Ultimately I want to deploy the host by way of gemini blueprint. In the near term, would you recommend that I extrapolate from a combination of the rest, EDEF and DS examples to accomplish this? Perhaps there a more direct route?

Thanks again,

-Alan

Thanks,

Scott

On 8/9/2012 6:32 PM, alans@xxxxxxxx wrote:
Hello,

My apology for the length of this post.

In running the remote services Restlet example all of the bundles are active as expected but the consumer fails silently, leading me to believe that I am missing a bundle or have the wrong set of bundles or am mixing versions inappropriately (the OSGi console short status for the host and consumer are at the bottom of this post).

The specific problem is that while the start(IApplicationContext) is called on the consumer's HelloConsumerApplication, the addingService(ServiceReference<IHelloResource>) is not called. No exceptions are thrown. It simply fails silently.

I believe that the host is working as expected. The IHelloResource appears to be available (see bundle report at the bottom of the post), and Restlet is listening on port 8080:

$ nc -z localhost 8080

Connection to localhost 8080 port [tcp/http-alt] succeeded!

The setup that I am using follows.

Eclipse IDE:

Version: Juno Release

Build id: 20120614-1722

Target Definition for both consumer and host:

${eclipse_home}

ECF Target Components Feature - http://download.eclipse.org/rt/ecf/3.5.6/site.p2

Restlet Update Site - http://p2.restlet.org/2.2

I am using the Restlet 2.2 SNAPSHOT, which includes Bryan Hunt's osgi extension, because the RestletClientContainer in the ecf provider has a dependency on org.restlet.engine.resource.AnnotationUtils.getInstance() that is not satisfied by Restlet 2.1.

The restlet provider was obtained from https://github.com/ECF/RestletProvider.git where there is only a [master] version. These projects are imported to both the host and consumer IDE instances:

/org.eclipse.ecf.provider.restlet

/org.eclipse.ecf.remoteservice.tm.restlet

The examples were taken from the [master] version of git://git.eclipse.org/gitroot/ecf/org.eclipse.ecf.git.

I have two Eclipse IDE instances, one running the consumer and the other running the host. On the host side I have imported these example projects:

/org.eclipse.ecf.examples.remoteservice.restlet.hello

/org.eclipse.ecf.examples.remoteservice.restlet.hello.host

On the consumer side I have imported these example projects;

/org.eclipse.ecf.examples.remoteservice.restlet.hello

/org.eclipse.ecf.examples.remoteservice.restlet.hello.consumer

The host launcher, "Restlet RSA Server.launch", is setup a bit different than my own with regard to what it assumes is in the "target_bundles" versus what are "workspace_bundles". That said, I believe that I reconciled what bundles are expected overall with the exception of a jetty "target_bundle", org.mortbay.jetty.util@default:default. It was not clear to me where this might have come from since versions 7 and 8 of Jetty are packaged as "org.eclipse" bundles. Nevertheless, the absence of this bundle did not keep the other bundles from becoming active.

The consumer launcher, "Restlet Hello Consumer.launch", went through the same reconciliation process for the bundles that are expected. I also validated the plug-ins in the run configuration.

The short status (ss) from the OSGi console follows for the host:

id State Bundle

0 ACTIVE org.eclipse.osgi_3.8.0.v20120529-1548

45 ACTIVE org.apache.commons.httpclient_3.1.0.v201012070820

46 ACTIVE org.eclipse.jetty.servlet_8.1.3.v20120522

47 ACTIVE org.eclipse.ecf.discovery_4.0.0.v20120610-1946

49 ACTIVE org.eclipse.ecf.remoteservice.tm.restlet_1.0.0.qualifier

50 ACTIVE org.eclipse.equinox.console_1.0.0.v20120522-1841

51 ACTIVE org.eclipse.equinox.http.servlet_1.1.300.v20120522-1841

52 ACTIVE org.eclipse.ecf_3.1.300.v20120610-1946

Fragments=60

54 ACTIVE org.apache.felix.gogo.shell_0.8.0.v201110170705

55 ACTIVE org.eclipse.jetty.http_8.1.3.v20120522

56 ACTIVE javax.servlet_3.0.0.v201112011016

57 RESOLVED org.eclipse.core.runtime.compatibility.registry_3.5.100.v20120521-2346

Master=78

58 ACTIVE org.apache.ant_1.8.3.v20120321-1730

59 ACTIVE org.eclipse.jetty.util_8.1.3.v20120522

60 RESOLVED org.eclipse.ecf.ssl_1.0.100.v20120610-1946

Master=52

61 ACTIVE org.eclipse.ecf.osgi.services.remoteserviceadmin_2.1.0.v20120610-1946

62 ACTIVE org.eclipse.ecf.identity_3.1.200.v20120610-1946

63 ACTIVE org.eclipse.equinox.common_3.6.100.v20120522-1841

64 ACTIVE org.eclipse.jetty.continuation_8.1.3.v20120522

65 ACTIVE javax.servlet.jsp_2.2.0.v201112011158

66 ACTIVE org.eclipse.jetty.server_8.1.3.v20120522

67 ACTIVE org.eclipse.osgi.services_3.3.100.v20120522-1822

68 ACTIVE org.apache.felix.gogo.runtime_0.8.0.v201108120515

69 ACTIVE org.eclipse.equinox.ds_1.4.0.v20120522-1841

70 ACTIVE org.apache.commons.logging_1.0.4.v201101211617

72 ACTIVE javax.el_2.2.0.v201108011116

73 ACTIVE org.eclipse.ecf.remoteservice_6.0.200.v20120610-1946

74 ACTIVE org.eclipse.equinox.util_1.0.400.v20120522-2049

75 ACTIVE org.eclipse.ecf.remoteservice.rest_2.2.200.v20120610-1946

76 ACTIVE org.apache.felix.gogo.command_0.8.0.v201108120515

77 ACTIVE org.eclipse.core.jobs_3.5.200.v20120521-2346

78 ACTIVE org.eclipse.equinox.registry_3.5.200.v20120522-1841

Fragments=57

79 ACTIVE org.eclipse.jetty.io_8.1.3.v20120522

80 ACTIVE org.eclipse.jetty.security_8.1.3.v20120522

81 ACTIVE org.eclipse.ecf.provider.restlet_1.0.0.qualifier

82 ACTIVE org.eclipse.ecf.examples.remoteservice.restlet.hello.host_1.0.0.qualifier

83 ACTIVE org.eclipse.equinox.http.jetty_3.0.0.v20120522-1841

84 ACTIVE org.eclipse.equinox.concurrent_1.0.300.v20120522-2049

85 ACTIVE org.eclipse.ecf.examples.remoteservice.restlet.hello_1.0.0.qualifier

86 ACTIVE org.eclipse.ecf.osgi.services.remoteserviceadmin.proxy_1.0.0.v20120610-1946

87 ACTIVE org.apache.commons.codec_1.3.0.v201101211617

88 ACTIVE org.eclipse.osgi.services.remoteserviceadmin_1.5.0.v20120610-1946

89 ACTIVE org.restlet.ext.wadl_2.2.0.snapshot-v20120804-1400

90 ACTIVE org.restlet.ext.osgi_2.2.0.snapshot-v20120804-1400

91 ACTIVE org.restlet.ext.xml_2.2.0.snapshot-v20120804-1400

92 ACTIVE org.restlet.ext.slf4j_2.2.0.snapshot-v20120804-1400

93 ACTIVE org.restlet_2.2.0.snapshot-v20120804-1400

94 ACTIVE org.restlet.ext.servlet_2.2.0.snapshot-v20120804-1400

95 ACTIVE org.restlet.ext.simple_2.2.0.snapshot-v20120804-1400

96 ACTIVE org.eclipse.ecf.provider.jmdns_4.1.0.v20120610-1946

97 ACTIVE org.json_1.0.0.v201011060100

98 ACTIVE org.eclipse.osgi.util_3.2.300.v20120522-1822

99 ACTIVE javax.xml_1.3.4.v201005080400

osgi>

The short status (ss) from the OSGi console follows for the consumer:

id State Bundle

0 ACTIVE org.eclipse.osgi_3.8.0.v20120529-1548

1 ACTIVE org.apache.commons.httpclient_3.1.0.v201012070820

2 ACTIVE org.eclipse.equinox.p2.repository_2.2.0.v20120524-1945

3 ACTIVE org.eclipse.equinox.console_1.0.0.v20120522-1841

4 ACTIVE org.eclipse.osgi.services_3.3.100.v20120522-1822

5 ACTIVE org.apache.commons.codec_1.3.0.v201101211617

6 ACTIVE org.eclipse.equinox.preferences_3.5.0.v20120522-1841

7 ACTIVE org.eclipse.equinox.p2.metadata_2.1.0.v20120430-2001

8 ACTIVE org.apache.felix.gogo.shell_0.8.0.v201110170705

9 ACTIVE org.restlet_2.2.0.snapshot-v20120804-1400

10 ACTIVE org.eclipse.equinox.concurrent_1.0.300.v20120522-2049

11 ACTIVE org.json_1.0.0.v201011060100

12 ACTIVE org.eclipse.equinox.security_1.1.100.v20120522-1841

Fragments=41

13 ACTIVE org.eclipse.equinox.common_3.6.100.v20120522-1841

14 ACTIVE org.eclipse.ecf.examples.remoteservice.restlet.hello_1.0.0.qualifier

15 ACTIVE org.eclipse.core.contenttype_3.4.200.v20120523-2004

16 ACTIVE org.apache.commons.logging_1.0.4.v201101211617

17 RESOLVED org.eclipse.core.runtime.compatibility.registry_3.5.100.v20120521-2346

Master=20

18 ACTIVE org.eclipse.equinox.p2.jarprocessor_1.0.200.v20110808-1657

19 ACTIVE org.apache.felix.gogo.runtime_0.8.0.v201108120515

20 ACTIVE org.eclipse.equinox.registry_3.5.200.v20120522-1841

Fragments=17

21 ACTIVE javax.servlet_3.0.0.v201112011016

22 ACTIVE org.eclipse.ant.core_3.2.400.v20120523-1752

23 ACTIVE org.hamcrest.core_1.1.0.v20090501071000

24 ACTIVE org.eclipse.core.jobs_3.5.200.v20120521-2346

25 ACTIVE org.eclipse.equinox.p2.core_2.2.0.v20120430-0525

26 ACTIVE org.eclipse.ecf.examples.remoteservice.restlet.hello.consumer_1.0.0.qualifier

27 ACTIVE org.apache.felix.gogo.command_0.8.0.v201108120515

28 ACTIVE org.apache.ant_1.8.3.v20120321-1730

29 ACTIVE org.eclipse.core.runtime_3.8.0.v20120521-2346

30 ACTIVE org.eclipse.core.runtime.compatibility.auth_3.2.300.v20120523-2004

31 ACTIVE org.eclipse.core.variables_3.2.600.v20120521-2012

32 ACTIVE org.eclipse.equinox.app_1.3.100.v20120522-1841

33 ACTIVE org.restlet.ext.servlet_2.2.0.snapshot-v20120804-1400

34 ACTIVE org.restlet.ext.osgi_2.2.0.snapshot-v20120804-1400

35 ACTIVE org.eclipse.ecf.osgi.services.remoteserviceadmin.proxy_1.0.0.v20120610-1946

36 RESOLVED org.eclipse.ecf.ssl_1.0.100.v20120610-1946

Master=46

37 ACTIVE org.eclipse.ecf.remoteservice.tm.restlet_1.0.0.qualifier

38 ACTIVE org.eclipse.ecf.identity_3.1.200.v20120610-1946

39 ACTIVE org.eclipse.ecf.discovery_4.0.0.v20120610-1946

40 ACTIVE org.eclipse.ecf.provider.restlet_1.0.0.qualifier

41 RESOLVED org.eclipse.equinox.security.macosx_1.100.200.v20120522-2049

Master=12

42 ACTIVE org.eclipse.osgi.services.remoteserviceadmin_1.5.0.v20120610-1946

43 ACTIVE org.eclipse.ecf.osgi.services.remoteserviceadmin_2.1.0.v20120610-1946

44 ACTIVE org.eclipse.ecf.remoteservice_6.0.200.v20120610-1946

45 ACTIVE org.eclipse.ecf.remoteservice.rest_2.2.200.v20120610-1946

46 ACTIVE org.eclipse.ecf_3.1.300.v20120610-1946

Fragments=36

47 ACTIVE org.restlet.ext.xml_2.2.0.snapshot-v20120804-1400

48 ACTIVE org.restlet.ext.wadl_2.2.0.snapshot-v20120804-1400

49 ACTIVE org.restlet.ext.simple_2.2.0.snapshot-v20120804-1400

50 ACTIVE org.eclipse.ecf.provider.jmdns_4.1.0.v20120610-1946

51 ACTIVE org.eclipse.osgi.util_3.2.300.v20120522-1822

52 ACTIVE javax.xml_1.3.4.v201005080400

osgi>

hello.host bundle and services:

osgi> bundle 82

org.eclipse.ecf.examples.remoteservice.restlet.hello.host_1.0.0.qualifier [82]

Id=82, Status=ACTIVE Data Root=/Users/mas/dev/tmp.server/.metadata/.plugins/org.eclipse.pde.core/Restlet RSA Server/org.eclipse.osgi/bundles/82/data

"Registered Services"

{org.restlet.ext.osgi.IResourceProvider}={component.name=org.eclipse.ecf.examples.remoteservice.restlet.hello, restlet.service.exported.interfaces=[org.eclipse.ecf.examples.remoteservice.restlet.hello.IHelloResource], component.id=3, paths=[/hello], service.id=67}

{org.restlet.ext.osgi.IRouterProvider}={component.name=org.eclipse.ecf.examples.remoteservice.restlet.app.router, component.id=4, service.id=68}

{org.restlet.ext.osgi.IApplicationProvider}={alias=/, component.name=org.eclipse.ecf.examples.remoteservice.restlet.app, component.id=2, service.id=69}

Services in use:

{org.restlet.ext.osgi.IRouterProvider}={component.name=org.eclipse.ecf.examples.remoteservice.restlet.app.router, component.id=4, service.id=68}

{org.restlet.ext.osgi.IResourceProvider}={component.name=org.eclipse.ecf.examples.remoteservice.restlet.hello, restlet.service.exported.interfaces=[org.eclipse.ecf.examples.remoteservice.restlet.hello.IHelloResource], component.id=3, paths=[/hello], service.id=67}

Exported packages

org.eclipse.ecf.examples.internal.remoteservice.restlet.hello.host; version="0.0.0"[exported]

Imported packages

org.eclipse.ecf.examples.remoteservice.restlet.hello; version="0.0.0"<org.eclipse.ecf.examples.remoteservice.restlet.hello_1.0.0.qualifier [85]>

org.restlet.ext.osgi; version="0.0.0"<org.restlet.ext.osgi_2.2.0.snapshot-v20120804-1400 [90]>

org.restlet; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.data; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.adapter; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.application; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.component; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.connector; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.converter; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.header; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.internal; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.io; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.local; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.log; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.resource; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.security; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.engine.util; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.representation; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.resource; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.routing; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.security; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.service; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

org.restlet.util; version="0.0.0"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

No fragment bundles

Named class space

org.eclipse.ecf.examples.remoteservice.restlet.hello.host; bundle-version="1.0.0.qualifier"[provided]

Required bundles

org.restlet; bundle-version="2.2.0.snapshot-v20120804-1400"<org.restlet_2.2.0.snapshot-v20120804-1400 [93]>

Thank you in advance for taking a look.

Kind regards,

-Alan Strait
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References:
- [ecf-dev] Remote service Restlet example question
  - From: alans
- Re: [ecf-dev] Remote service Restlet example question
  - From: Scott Lewis

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