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Sample Stomp message queue consumer code for Fedora
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| --Headers: { | |
| "destination": "/topic/fedora", | |
| "expires": "0", | |
| "message-id": "ID:wikibase-36143-1638450997244-4:1:1:1:6", | |
| "org.fcrepo.jms.baseURL": "http://141.94.169.145:8080/rest", | |
| "org.fcrepo.jms.eventID": "urn:uuid:cd36ab67-4a51-4e88-96ab-b07acf71d625", | |
| "org.fcrepo.jms.eventType": "https://www.w3.org/ns/activitystreams#Create", | |
| "org.fcrepo.jms.identifier": "/galaxy", | |
| "org.fcrepo.jms.resourceType": "http://mementoweb.org/ns#TimeGate,http://www.w3.org/ns/ldp#BasicContainer,http://fedora.info/definitions/v4/repository#Resource,http://mementoweb.org/ns#OriginalResource,http://www.w3.org/ns/ldp#Container,http://www.w3.org/ns/ldp#Resource,http://www.w3.org/ns/ldp#RDFSource,http://fedora.info/definitions/v4/repository#Container", | |
| "org.fcrepo.jms.timestamp": "1638519905399", | |
| "org.fcrepo.jms.user": "null", | |
| "org.fcrepo.jms.userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36", | |
| "persistent": "true", | |
| "priority": "4", | |
| "subscription": "abcd", | |
| "timestamp": "1638519905410" | |
| } | |
| --Body: { | |
| "id": "urn:uuid:cd36ab67-4a51-4e88-96ab-b07acf71d625", | |
| "type": ["Create"], | |
| "name": "create resource", | |
| "published": "2021-12-03T08:25:05.399035Z", | |
| "actor": [{ | |
| "type": "Person", | |
| "id": "null" | |
| }, { | |
| "type": "Application", | |
| "name": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36" | |
| }], | |
| "object": { | |
| "type": ["http://mementoweb.org/ns#TimeGate", "http://www.w3.org/ns/ldp#BasicContainer", "http://fedora.info/definitions/v4/repository#Resource", "http://mementoweb.org/ns#OriginalResource", "http://www.w3.org/ns/ldp#Container", "http://www.w3.org/ns/ldp#Resource", "http://www.w3.org/ns/ldp#RDFSource", "http://fedora.info/definitions/v4/repository#Container", "http://www.w3.org/ns/prov#Entity"], | |
| "id": "http://141.94.169.145:8080/rest/galaxy", | |
| "isPartOf": "http://141.94.169.145:8080/rest" | |
| }, | |
| "@context": ["https://www.w3.org/ns/activitystreams#", { | |
| "prov": "http://www.w3.org/ns/prov#", | |
| "dcterms": "http://purl.org/dc/terms/", | |
| "type": "@type", | |
| "id": "@id", | |
| "isPartOf": { | |
| "@id": "dcterms:isPartOf", | |
| "@type": "@id" | |
| } | |
| }] | |
| } |
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| """Fedora listener | |
| Listens for ActiveMQ messages using the stomp message queue library. | |
| The equivalent using stomp itself would look as follows; | |
| stomp -H localhost -P 61613 | |
| > subscribe /topic/fedora | |
| Modified from Lyrasis: | |
| * https://wiki.lyrasis.org/display/FEDORAM6M1P0/Inspect+Event+Messages | |
| """ | |
| import json | |
| import stomp | |
| import signal | |
| class Listener(stomp.ConnectionListener): | |
| def on_message(self, frames): | |
| print("\n\nIncoming Message") | |
| print("--Headers:") | |
| print(json.dumps(frames.headers, indent=2, sort_keys=True)) | |
| print("\n--Body:") | |
| print(json.dumps(frames.body, indent=2, sort_keys=True)) | |
| connection = stomp.Connection(host_and_ports=[("localhost", 61613)]) | |
| connection.set_listener("", Listener()) | |
| connection.connect() | |
| connection.subscribe(id="abcd", destination="/topic/fedora") | |
| while True: | |
| signal.pause() |
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Question is, how does one provide a retroactive argument? Further, is fcrepo configured to store messages so that they can be retroactively sent out? e.g. one possibility?
headers={"activemq.retroactive": "true"}