"Composing Music in the Cloud" by James Weaver Leveraging the power of the cloud and microservices, this session demonstrates how music can be analyzed and composed in real-time to augment musical performance with a futuristic instrument. This session contains an introduction to relevant cloud technologies, and an introduction to music theory and composition. This session also has musical demonstrations and code snippets scattered throughout. Enabling technologies demonstrated in this session include Spring Boot and Cloud Foundry.

1. Composing Music in the CloudComposing Music in the Cloud
Counterpoint Composer from a technical perspectiveCounterpoint Composer from a technical perspective
James L. Weaver
Developer / Evangelist
Pivotal Software
Twitter: @JavaFXpert
Email: jweaver@pivotal.io
http://JavaFXpert.com
http://CulturedEar.com
http://CounterpointComposer.com

2. High-level architectureHigh-level architecture

3. Source code is in GitHub:Source code is in GitHub:
CounterpointService and Counterpoint Composer UI:
ChordAnalyzerService and Chord Analyzer Client:
https://github.com/JavaFXpert/counterpoint-service
https://github.com/JavaFXpert/chord-analyzer-service
Note: These Technical Presentation slides and Getting Started
slides are available on the Help menu:CounterpointComposer.com

4. RESTful services & usageRESTful services & usage

5. Let's examine theLet's examine the
ChordAnalyzerServiceChordAnalyzerService

6. Resource controllerResource controller
http://example/analyze?notes=G3 D4 B4
Note: Because is on the classpath,
Spring’s is automatically
chosen to convert the MusicChord instance to JSON
Jackson 2
MappingJackson2HttpMessageConverter
@RestController
public class ChordAnalyzerController {
private MusicChord musicChord;
@RequestMapping("/analyze") // endpoints s/b nouns, so analysis is a better name
public MusicChord identifyChordByNotes(@RequestParam(value = "notes") String notes) {
...
return musicChord;
}
}
To learn more, see Spring GuideBuilding a RESTful Web Service

7. Resource representationResource representation
public class MusicChord {
private final String root;
private final String chordType;
private final String bassNote;
public MusicChord(String root, String chordType, String bassNote) {
this.root = root;
this.chordType = chordType;
this.bassNote = bassNote;
}
public String getRoot() {
return root;
}
public String getChordType() {
return chordType;
}
public String getBassNote() {
return bassNote;
}
}

8. Make the app executableMake the app executable
package com.culturedear.chord;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ChordAnalyzerServiceApplication {
public static void main(String[] args) {
SpringApplication.run(ChordAnalyzerServiceApplication.class, args);
}
}
To learn more, see Spring GuideBuilding a RESTful Web Service

9. App build/deploy cycleApp build/deploy cycle
1. $ mvn clean install
2. $ cf push -p ./target/counterpoint-service.jar CounterpointService
Note: One method of deployment for Spring Boot apps is a JAR
file, which contains an embedded Tomcat servlet container.

10. Pivotal Web Services ConsolePivotal Web Services Console

11. start.spring.iostart.spring.io

12. Chord Analyzer ClientChord Analyzer Client
Leverages Web MIDI API (currently supported in Chrome)
Use any MIDI keyboard controller
http://chordanalyzerservice.cfapps.io/

13. Counterpoint ComposerCounterpoint Composer
from a technical perspectivefrom a technical perspective
James L. Weaver
Developer / Evangelist
Pivotal Software
Twitter: @JavaFXpert
Email: jweaver@pivotal.io
http://JavaFXpert.com
http://CulturedEar.com
http://CounterpointComposer.com
Hope you enjoyed