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202 LICENSE
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+project.organization=scalaz
+project.name=camel
+sbt.version=0.7.5.RC0
+project.version=0.1
+build.scala.versions=2.8.0
+project.initialize=false
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+import sbt._
+
+class Project(info: ProjectInfo) extends DefaultProject(info) {
+ val ScalazVersion = "5.0"
+ val CamelVersion = "2.5.0"
+
+ val scalazCore = "com.googlecode.scalaz" % "scalaz-core_2.8.0" % ScalazVersion % "compile"
+
+ val camelCore = "org.apache.camel" % "camel-core" % CamelVersion % "compile" withSources
+ val camelJms = "org.apache.camel" % "camel-jms" % CamelVersion % "compile" withSources
+ val cameHttp = "org.apache.camel" % "camel-http" % CamelVersion % "compile" withSources
+ val camelJetty = "org.apache.camel" % "camel-jetty" % CamelVersion % "compile" withSources
+ val camelSpring = "org.apache.camel" % "camel-spring" % CamelVersion % "compile" withSources
+ val activemqCore = "org.apache.activemq" % "activemq-core" % "5.3.2" % "compile" withSources
+
+ val scalatest = "org.scalatest" % "scalatest" % "1.2" % "test"
+ val junit = "junit" % "junit" % "4.8.2" % "test"
+}
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+import sbt._
+
+class Plugins(info: ProjectInfo) extends PluginDefinition(info) {
+}
+
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+/*
+ * Copyright 2010 the original author or authors.
+ *
+ * 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 scalaz.camel
+
+/**
+ * Imported by applications that want to use the <code>CamelDsl</code>
+ *
+ * @author Martin Krasser
+ */
+object Camel extends CamelDsl
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2010 the original author or authors.
+ *
+ * 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 scalaz.camel
+
+import org.apache.camel.{CamelContext, Processor}
+
+import scala.Either.RightProjection
+import scalaz._
+
+/**
+ * Defines the (implicit) conversions from message processing functions, Camel
+ * processors and endpoint URIs to a concrete Kleisli type that can be used to
+ * construct message-processing routes via Kleisli composition.
+ *
+ * @author Martin Krasser
+ */
+trait CamelConv {
+ import Scalaz._
+ import Message._
+
+ /**
+ * The monad used for Kleisli composition. This monad ensures that message processors
+ * <ul>
+ * <li>returning Left(exception) cause a Kleisli-composed route to stop message processing</li>
+ * <li>returning Right(message) cause a Kleisli-composed route to continue message processing</li>
+ * </ul>
+ */
+ type RightProjectionMonad[B] = PartialApply1Of2[RightProjection, Exception]#Apply[B]
+
+ /** Concrete Kleisli type of a message processor */
+ type MessageProcessorKleisli = Kleisli[RightProjectionMonad, Message, Message]
+
+ /** Message processor returning Right(message) when successful or Left(exception) on error */
+ type MessageProcessor = Message => Either[Exception, Message]
+
+ /** Function that combines two messages into into one */
+ type MessageAggregator = (Message, Message) => Message
+
+ /**
+ * Converts a message processing function to a <code>MessageProcessorKleisli</code>.
+ */
+ implicit def messageProcessorFunctionToMessageProcessorKleisli(p: Message => Message): MessageProcessorKleisli =
+ kleisliProcessor(messageProcessor(p))
+
+ /**
+ * Converts a Camel message processor to a <code>MessageProcessorKleisli</code>.
+ */
+ implicit def processorToMessageProcessorKleisli(p: Processor): MessageProcessorKleisli =
+ kleisliProcessor(messageProcessor(p))
+
+ /**
+ * Converts a Camel endpoint defined by <code>uri</code> to a <code>MessageProcessorKleisli</code>
+ * for producing to that endpoint.
+ */
+ implicit def uriStringToMessageProcessorKleisli(uri: String)(implicit context: CamelContext): MessageProcessorKleisli =
+ kleisliProcessor(messageProcessor(uri, context))
+
+ implicit def messageProcessorKleisliToMessageProcessor(p: MessageProcessorKleisli): MessageProcessor =
+ (m: Message) => (p apply m).e
+
+ def kleisliFunction(p: MessageProcessorKleisli) =
+ kleisliFn[RightProjectionMonad, Message, Message](p)
+
+ def kleisliProcessor(p: MessageProcessor) =
+ kleisli[RightProjectionMonad, Message, Message]((m: Message) => p(m).right)
+
+ private[camel] def messageProcessor(p: Message => Message): MessageProcessor = (m: Message) => {
+ try {
+ Right(p(m))
+ } catch {
+ case e: Exception => Left(e)
+ }
+ }
+
+ private[camel] def messageProcessor(p: Processor): MessageProcessor = (m: Message) => {
+ // TODO: operate on a copy of m.exchange otherwise processors could modify the shared exchange
+ val me = m.exchange.getOrElse(throw new IllegalArgumentException("Message exchange not set"))
+
+ // pre-process exchange
+ me.getIn.fromMessage(m)
+ me.setOut(null)
+
+ try {
+ p.process(me)
+ if (me.isFailed) {
+ Left(me.getException)
+ } else {
+ val rm = if (me.hasOut) me.getOut else me.getIn
+ // post-process exchange
+ me.setOut(null)
+ me.setIn(rm)
+ Right(rm.toMessage)
+ }
+ } catch {
+ case e: Exception => Left(e)
+ }
+ }
+
+ private[camel] def messageProcessor(uri: String, context: CamelContext): MessageProcessor = {
+ val endpoint = context.getEndpoint(uri)
+ val producer = endpoint.createProducer
+
+ // TODO: manage producer (and do not start producer during route construction)
+ // ...
+
+ producer.start
+ messageProcessor(producer)
+ }
+}
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