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Add scala-based example Resolves: https://jira.duraspace.org/browse/FCREPO-1282
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| Fcrepo Camel OSGi Project | ||
| ========================= | ||
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| This is a sample project that listens to fedora's JMS message stream, | ||
| passing updates to an external triplestore and solr index. The component | ||
| also exposes a REST endpoint for re-indexing the entire collection. | ||
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| To build this project use | ||
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| mvn install | ||
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| Once built, this can be deployed in an OSGi container, such as | ||
| [Karaf](https://karaf.apache.org). If using Karaf, add the fcrepo-camel | ||
| jarfile to $KARAF_HOME/deploy. Then, add this component to the same deploy | ||
| directory. | ||
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| Properties can be defined and updated in an org.fcrepo.camel.examples.osgi.cfg | ||
| file. | ||
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| For more help see the Apache Camel documentation | ||
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| http://camel.apache.org/ | ||
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72 changes: 72 additions & 0 deletions
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examples/fcrepo-camel-osgi/src/main/java/org/fcrepo/camel/examples/osgi/DeleteRouter.java
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| /** | ||
| * Copyright 2014 DuraSpace, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.fcrepo.camel.examples.osgi; | ||
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| import org.apache.camel.Exchange; | ||
| import org.apache.camel.builder.RouteBuilder; | ||
| import org.fcrepo.camel.HttpMethods; | ||
| import org.fcrepo.camel.JmsHeaders; | ||
| import org.fcrepo.camel.processor.SparqlDeleteProcessor; | ||
|
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| /** | ||
| * A Camel Router for handling delete operations. | ||
| * | ||
| * @author Aaron Coburn | ||
| */ | ||
| public class DeleteRouter extends RouteBuilder { | ||
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| public void configure() throws Exception { | ||
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| final String solrFormat = "{\"delete\":{\"id\":\"${headers[%s]}\", \"commitWithin\": \"500\"}}"; | ||
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| /** | ||
| * A generic error handler (specific to this RouteBuilder) | ||
| */ | ||
| onException(Exception.class) | ||
| .handled(true) | ||
| .transform() | ||
| .simple("Delete Error: ${routeId}") | ||
| .to("direct:error.log"); | ||
|
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| /* | ||
| * Handle items in the delete queue. | ||
| */ | ||
| from("seda:delete") | ||
| .routeId("FcrepoDelete") | ||
| .multicast().to("direct:delete.log", "direct:delete.triplestore", "direct:delete.solr"); | ||
|
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| /* | ||
| * Remove objects from the triplestore. | ||
| */ | ||
| from("direct:delete.triplestore") | ||
| .routeId("FcrepoDeleteTriplestore") | ||
| .process(new SparqlDeleteProcessor()) | ||
| .to("http4:{{triplestore.baseUrl}}/update?throwExceptionOnFailure=false"); | ||
|
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| /* | ||
| * Remove objects from the solr index. | ||
| */ | ||
| from("direct:delete.solr") | ||
| .routeId("FcrepoDeleteSolr") | ||
| .setHeader(Exchange.CONTENT_TYPE) | ||
| .constant("application/json") | ||
| .setHeader(Exchange.HTTP_METHOD) | ||
| .constant(HttpMethods.POST) | ||
| .transform() | ||
| .simple(String.format(solrFormat, JmsHeaders.IDENTIFIER)) | ||
| .to("http4://{{solr.baseUrl}}/update"); | ||
| } | ||
| } |
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examples/fcrepo-camel-osgi/src/main/java/org/fcrepo/camel/examples/osgi/EventRouter.java
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| /** | ||
| * Copyright 2014 DuraSpace, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.fcrepo.camel.examples.osgi; | ||
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| import org.apache.camel.builder.RouteBuilder; | ||
| import org.fcrepo.camel.JmsHeaders; | ||
| import org.fcrepo.camel.RdfNamespaces; | ||
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| /** | ||
| * A content router for handling JMS events. | ||
| * | ||
| * @author Aaron Coburn | ||
| */ | ||
| public class EventRouter extends RouteBuilder { | ||
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| public void configure() throws Exception { | ||
|
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| /** | ||
| * A generic error handler (specific to this RouteBuilder) | ||
| */ | ||
| onException(Exception.class) | ||
| .handled(true) | ||
| .transform() | ||
| .simple("Event Routing Error: ${routeId}") | ||
| .to("direct:error.log"); | ||
|
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| /** | ||
| * route a message to the proper queue, based on whether | ||
| * it is a DELETE or UPDATE operation. | ||
| */ | ||
| from("activemq:{{jms.fcrepoEndpoint}}") | ||
| .routeId("FcrepoEventRouter") | ||
| .to("direct:event.log") | ||
| .choice() | ||
| .when(header(JmsHeaders.EVENT_TYPE).isEqualTo(RdfNamespaces.REPOSITORY + "NODE_REMOVED")) | ||
| .to("seda:delete?blockWhenFull=true") | ||
| .otherwise() | ||
| .to("seda:update?blockWhenFull=true"); | ||
| } | ||
| } |
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...es/fcrepo-camel-osgi/src/main/java/org/fcrepo/camel/examples/osgi/IndexPathProcessor.java
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| /** | ||
| * Copyright 2014 DuraSpace, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.fcrepo.camel.examples.osgi; | ||
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| import java.net.URL; | ||
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| import org.apache.camel.Processor; | ||
| import org.apache.camel.Exchange; | ||
| import org.apache.camel.Message; | ||
| import org.fcrepo.camel.FcrepoHeaders; | ||
|
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| /** | ||
| * A processor that converts the REST uri into the | ||
| * identifying path for an fcrepo node. | ||
| * | ||
| * This assumes that the `restPrefix` value is stored | ||
| * in the org.fcrepo.camel.examples.osgi.restPrefix header. | ||
| * | ||
| * @author Aaron Coburn | ||
| */ | ||
| public class IndexPathProcessor implements Processor { | ||
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| public void process(final Exchange exchange) throws Exception { | ||
| final Message in = exchange.getIn(); | ||
| final URL url = new URL(in.getHeader(Exchange.HTTP_URI, String.class)); | ||
| final String prefix = in.getHeader(MessageHeaders.REST_PREFIX, String.class); | ||
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| in.setHeader(FcrepoHeaders.FCREPO_IDENTIFIER, | ||
| url.getPath().substring(prefix.length())); | ||
| in.setHeader(FcrepoHeaders.FCREPO_BASE_URL, | ||
| in.getHeader(MessageHeaders.BASE_URL, String.class)); | ||
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| in.removeHeaders("CamelHttp*"); | ||
| in.removeHeaders("CamelRestlet*"); | ||
| in.removeHeaders("org.restlet*"); | ||
| } | ||
| } |
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examples/fcrepo-camel-osgi/src/main/java/org/fcrepo/camel/examples/osgi/IndexRouter.java
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| /** | ||
| * Copyright 2014 DuraSpace, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.fcrepo.camel.examples.osgi; | ||
|
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| import javax.xml.transform.stream.StreamSource; | ||
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| import org.apache.camel.builder.RouteBuilder; | ||
| import org.apache.camel.builder.xml.XPathBuilder; | ||
| import org.apache.camel.builder.xml.Namespaces; | ||
| import org.apache.camel.Exchange; | ||
| import org.fcrepo.camel.FcrepoHeaders; | ||
| import org.fcrepo.camel.RdfNamespaces; | ||
|
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| /** | ||
| * A router for traversing a node hierarchy, initiating' | ||
| * re-indexing operations. | ||
| * | ||
| * @author Aaron Coburn | ||
| */ | ||
| public class IndexRouter extends RouteBuilder { | ||
|
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| public void configure() throws Exception { | ||
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| final Namespaces ns = new Namespaces("rdf", RdfNamespaces.RDF); | ||
| ns.add("ldp", RdfNamespaces.LDP); | ||
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| final XPathBuilder children = new XPathBuilder("/rdf:RDF/rdf:Description/ldp:contains"); | ||
| children.namespaces(ns); | ||
|
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| /** | ||
| * A generic error handler (specific to this RouteBuilder) | ||
| */ | ||
| onException(Exception.class) | ||
| .handled(true) | ||
| .transform() | ||
| .simple("Indexing Error: ${routeId}") | ||
| .to("direct:error.log"); | ||
|
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| /** | ||
| * Index objects, starting at the identified node | ||
| */ | ||
| from("direct:index") | ||
| .routeId("FcrepoIndexEndpoint") | ||
| .log(String.format("Initial indexing path: ${headers[%s]}", Exchange.HTTP_URI)) | ||
| .setHeader(MessageHeaders.REST_PREFIX) | ||
| .constant("{{rest.prefix}}") | ||
| .setHeader(MessageHeaders.BASE_URL) | ||
| .constant("http://{{fcrepo.baseUrl}}") | ||
| .process(new IndexPathProcessor()) | ||
| .to("seda:enqueue?waitForTaskToComplete=Never&blockWhenFull=true") | ||
| .setHeader(Exchange.CONTENT_TYPE) | ||
| .constant("text/plain") | ||
| .transform() | ||
| .simple(String.format("Indexing started at ${headers[%s]}", FcrepoHeaders.FCREPO_IDENTIFIER)); | ||
|
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| /** | ||
| * Buffer index requests in an asynchronous queue before sending to ActiveMQ | ||
| */ | ||
| from("seda:enqueue") | ||
| .routeId("FcrepoEnqueue") | ||
| .removeHeaders("CamelHttp*") | ||
| .to("activemq:queue:index"); | ||
|
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| /** | ||
| * Process indexing requests from the index queue | ||
| */ | ||
| from("activemq:queue:index") | ||
| .routeId("FcrepoIndexer") | ||
| .streamCaching() | ||
| .to("seda:update?waitForTaskToComplete=Never&blockWhenFull=true") | ||
| .removeHeaders("CamelHttp*") | ||
| .setHeader(Exchange.HTTP_METHOD) | ||
| .constant("GET") | ||
| .to("fcrepo:{{fcrepo.baseUrl}}?preferInclude=PreferContainment&preferOmit=ServerManaged") | ||
| .convertBodyTo(StreamSource.class) | ||
| .split(children).streaming() | ||
| .transform() | ||
| .xpath("/ldp:contains/@rdf:resource", String.class, ns) | ||
| .process(new NodePathProcessor()) | ||
| .to("seda:enqueue?waitForTaskToComplete=Never&blockWhenFull=true"); | ||
| } | ||
| } |
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