net.osgiliath.hello.routes.HelloRoute Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of net.osgiliath.hello.routes.blueprint Show documentation
Routes between UI and business made with blueprint
The newest version!
package net.osgiliath.hello.routes;

/*
 * #%L
 * net.osgiliath.hello.routes
 * %%
 * Copyright (C) 2013 Osgiliath
 * %%
 * 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.
 * #L%
 */

import java.io.InputStream;
import java.io.StringWriter;

import javax.ws.rs.HttpMethod;
import javax.ws.rs.core.MediaType;
import javax.xml.bind.JAXBContext;

import lombok.Setter;
import net.osgiliath.hello.business.model.Hellos;
import net.osgiliath.hello.model.jpa.model.HelloEntity;

import org.apache.camel.Exchange;
import org.apache.camel.LoggingLevel;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.jackson.JacksonDataFormat;
import org.apache.camel.converter.jaxb.JaxbDataFormat;
import org.apache.camel.spi.DataFormat;
import org.apache.commons.io.IOUtils;

/**
 * sample route, see apache camel and EIP keyword on the net ;).
 * 
 * @author charliemordant
 */
public class HelloRoute extends RouteBuilder {
  /**
   * Jackson converters.
   */
  private final transient DataFormat helloObjectJSonFormat = new JacksonDataFormat(
      HelloEntity.class, Hellos.class);
  /**
   * processes JSR303 validation errors.
   */
  @Setter
  private transient Processor thrownExceptionMessageToInBodyProcessor;
  /**
   * xmljson dataformat.
   */
  @Setter
  private transient DataFormat xmljson;
  /**
   * changes inputstream to string.
   */
  private final transient Processor octetsStreamToStringProcessor = new Processor() {

    @Override
    public void process(Exchange exchange) throws Exception {
      final InputStream bodyObject = exchange.getIn()
          .getBody(InputStream.class);
      final StringWriter writer = new StringWriter();
      IOUtils.copy(bodyObject, writer);
      final String theString = writer.toString();
      exchange.getIn().setBody(theString);

    }
  };

  /**
   * Configures routes.
   */
  @Override
  public void configure() throws Exception {
    final JAXBContext ctx = JAXBContext.newInstance(new Class[] {
        HelloEntity.class, Hellos.class, });
    final DataFormat jaxBDataFormat = new JaxbDataFormat(ctx);

    from("{{hello.MessagingEntryPoint}}")
        .log(LoggingLevel.INFO, "Received message: \"${in.body}\"")
        .filter(header("webSocketMsgType").isNotEqualTo("heartBeat"))
        .choice()
        .when(header("httpRequestType").isEqualTo(HttpMethod.POST))
        .to("direct:persistObject")
        .endChoice()
        .otherwise()
        .setBody(
            simple("{error:  'Command not supported for the JaxRS queue'}"))
        .to("direct:toError");

    from("direct:persistObject")
        .setHeader(Exchange.HTTP_METHOD, constant(HttpMethod.POST))
        .setHeader(Exchange.CONTENT_TYPE, constant(MediaType.APPLICATION_XML))
        .unmarshal(this.helloObjectJSonFormat).marshal(jaxBDataFormat)
        .log(LoggingLevel.INFO, "marshalled: ${body}").doTry()
        .inOnly("{{net.osgiliath.hello.business.url.restservice}}/hello")
        .to("direct:updateTopic").doCatch(Exception.class)
        .log(LoggingLevel.WARN, "Validation exception encountered")
        .to("direct:helloValidationError").end();

    from("direct:updateTopic")
        .setHeader(Exchange.HTTP_METHOD, constant(HttpMethod.GET))
        .setHeader(Exchange.CONTENT_TYPE, constant(MediaType.APPLICATION_XML))
        .inOut("{{net.osgiliath.hello.business.url.restservice}}/hello")
        .inOut("direct:marshall").to("{{hello.MessagingEndPoint}}");

    from("direct:marshall").process(this.octetsStreamToStringProcessor)
        .log("hello data retrieved from JaxRS : ${in.body}").marshal(xmljson)
        .log(LoggingLevel.INFO, "marshalled: ${body}");

    from("direct:helloValidationError")
        .process(this.thrownExceptionMessageToInBodyProcessor)
        .process(new Processor() {

          @Override
          public void process(Exchange exchange) throws Exception {
            exchange.getIn().setBody(
                exchange.getIn().getBody(String.class).replaceAll("\"", "'")
                    .replaceAll("\n", ""));
          }
        }).setBody(simple("{\"error\": \"${body}\"}"))
        .log("Subscription error: ${body}").to("{{hello.MessagingErrors}}");

  }
}