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The Apache Tuscany SCA Samples
==============================
The Apache Tuscany SCA samples are built as part of the main Maven build and
run, using the provided JUnit test cases, as tests in the Maven build.
In the binary distribution of Apache Tuscany the samples can also
be run using the provided Ant build.xml files. These show the samples running
from a simple main() method without the need for a JUnit test case.
In these notes text that appears in angled brackets like this <example> means
that you need to make a choice and provide your own text at that point.
These simple samples have been created with the intention of illustrating the
usage of the SCA API and annotations and certainly not to levels of SCA component
abstraction. In real life situations you should use SCA to assemble real and
usually bigger components, and when you do that you'll get all the benefits of
SCA, bindings, policies, integration in an SOA environment etc..
Sample Overview
---------------
The samples generally show off different features of the SCA runtime
and the extensions that come packaged with it. This list is ordered in a rough
order of increasing complexity.
calculator - A calculator built with java components and local
wires
calculator-script - The calculator but this time built using various
script languages
calculator-webapp - The calculator again but this time running inside a
web app
chat-webapp - A simple chat style web app demonsrating how to use
the AJAX binding
feed-aggregator - Demonstrates using the ATOM binding
helloworld-ws-reference - The client side of a hello world sample that uses a
web service binding
helloworld-ws-service - The server side of a hello world sample that uses a
web service binding
calculator-rmi-reference - The calculator configured to talk RMI to the
calculator-rmi-service sample
calculator-rmi-service - The calculator configured to accept RMI requests
from calculator-rmi-reference
helloworld-jsonrpc - An SCA application that exposes a service using
JSONRPC
helloworld-dojo - An SCA application that exposes a service using
JSONRPC and a client using the Dojo toolkit
simple-callback - An SCA application with two components demonstrating
the callback interface
implementation-composite - An SCA application that shows how composites are used to
implement components
supplychain - A more complicated sample showing how asynchronous
callbacks can be used
databinding-echo - An SCA application that shows how databindings
transform data
simple-bigbank - A banking application built with java components
and local wires
There are two samples that demonstrate how to build extensions for the
Tuscany SCA runtime. These samples are slightly different from the samples
above in that the provided code is concerned with building the extension
and not with building an application that uses it. The application
that shows how the new extension can be used is provided in an associated
sample.
implementation-crud-extension - Shows how to build new implementation type
extensions
implementation-crud - A sample application that exercises the new
implementation extensions
binding-echo-extension - Shows how to build new binding extensions
binding-echo - A sample application that exercises the new
binding extension
Sample Layout
-------------
All sample directories are organized in the same way based on the default
project template provided by Maven. For example, take a look at the calculator
sample;
calculator/
src/ - Holds all of the source files for the sample
main/ - Groups together the files that implement the sample
java/ - Java source files
resources/ - Non java resource files such as composte files
test/ - Groups together files that provide sample tests
java - Java test sources files. Usually JUnit test cases
target/ - Holds the files generated when the sample is built
classes/ - For example, Java class files
test-classes/ - classes from src/test and other test files
Getting Ready To Build
----------------------
You will need to install the following software before you start.
J2SE Development Kit (JDK) 5.0
Apache Ant 1.7.0 - if you are going to use Ant
Apache Maven 2.0.6 - if you are going to use Maven
Java and Ant and/or Maven binary directories must be present in your PATH so
that their executable programs are available in your environment. You may
find it useful to use a script to set up your environment, for example;
For UNIX:
JAVA_HOME=/<installation_directory>
ANT_HOME=/<installation_directory>/apache-ant-1.7.0
MAVEN_HOME=/<installation_directory>/maven-2.0.6
export PATH=$JAVA_HOME/bin:$ANT_HOME/bin:$MAVEN_HOME/bin:$PATH
For Windows:
set JAVA_HOME=C:\<installation_directory>
set ANT_HOME=C:\<installation_directory>\apache-ant-1.7.0
set MAVEN_HOME=C:\<installation_directory>\maven-2.0.6
set PATH=%JAVA_HOME%\bin;%ANT_HOME%\bin;%MAVEN_HOME%\bin;%PATH%
Building And Running The SCA Samples Using Ant
----------------------------------------------
The build.xml files provided with the Apache Tuscany SCA samples are designed
to work with the binary distribution. They rely on the tuscany-sca-manifest.jar
to describe the class path and this jar is only provided as part of the
binary distribution.
The binary distribution of SCA also includes precompiled versions of each sample.
If you look in the target directory of each sample you will see this jar file. To
run a sample based on all of the precompiled artifacts all you have to do is:
cd <sampledir>
ant run
Check each <sampledir>/README file as some samples require that two progams are
run to get the desired result, for example, the two samples that show how
to build extensions are run from their associated application samples.
If you want to rebuild a sample, for example, if you have changed it, do the
following:
cd <sampledir>
ant compile
Once the sample is built you have the option of running the sample in whatever
way best suits you. Two alternatives are provided in the ant build files.
The compile target builds the class files and then builds the jar so you can use
the same command as before:
ant run
This will use the generated jar to run the samples. The command line version of
this is:
on Windows
java -cp ..\..\lib\tuscany-sca-manifest.jar;target\<sample jar file> <sample runnable class>
for example : java -cp ..\..\lib\tuscany-sca-manifest.jar;target\sample-calculator.jar calculator.CalculatorClient
on *nix
java -cp ../../lib/tuscany-sca-manifest.jar:target/<sample jar file> <sample runnable class>
for example : java -cp ../../lib/tuscany-sca-manifest.jar:target/sample-calculator.jar calculator.CalculatorClient
You can use the compiled classes directly using
ant run-classes
The command line version of this is:
on Windows
java -cp ..\..\lib\tuscany-sca-manifest.jar;target\classes <sample runnable class>
for example : java -cp ..\..\lib\tuscany-sca-manifest.jar;target\classes calculator.CalculatorClient
on *nix
java -cp ../../lib/tuscany-sca-manifest.jar:target/classes <sample runnable class>
for example : java -cp ../../lib/tuscany-sca-manifest.jar:target/classes calculator.CalculatorClient
The class specified on the command of course depends on which sample you want to
run. In the examples we have used we are running the CalculatorClient from the calculator sample.
Building And Running The SCA Samples Using Maven
------------------------------------------------
The Maven build process will work from both source and binary distributions.
To build and test all of the Apache Tuscany SCA sources, including the samples,
do the following.
cd sca
mvn
This will take a little while to complete. Experience with Maven tells us that
sometimes there are problems downloading the dependencies that Apache Tuscany
SCA requires. If Maven reports that it cannot download required dependencies
try running the Maven build again.
Once you have all of the source built you can build and run each sample
independently if required.
cd <sampledir>
mvn
When using Maven the samples are run within JUnit test cases and so you will
sometimes not see any test output. You will always see an indication of test
success or failure.
Using The Samples In An IDE
---------------------------------------------
The easiest way to use the samples in an IDE is to use Maven to generate all
of the IDE project files for you automatically. This works best if you
generate IDE projects for all of the Apache Tuscany modules. You can then
include the ones you are interested in working with in you IDE.
To build IDE project files for all of the modules in Apache Tuscany SCA;
cd sca
If you are an Eclipse user do the following
mvn -Peclipse eclipse:eclipse
If you are an IDEA user do the following
mvn idea:idea
These commands generate project files for each module in Apache Tuscany SCA.
The modules you are interested in can now be included in your IDE, for example,
in Eclipse, if you create a new Java project and use the option to "create a
new project from existing source" you can specify an SCA module directory,
which includes the generated project files, and Eclipse will treat it like any
other Java project.
Using The Samples In An IDE Without Maven
-----------------------------------------
We don't provide any IDE project files with our distributions so you will have to
import the sample files into your IDE manually. Here's an example of how it can be
done using Eclipse.
In a new or existing workspace
Create a new java project to represent the sample you want to work on, e.g.
calculator
Import all of the sample code and resources into this project, e.g.
File, Import and then select tuscany-sca-0.90-incubating\samples\calculator from the filesystem
Configure the source path to include
src/main/java
src/main/resources
Configure the output folder to be
calculator/target
Configure the build path to include all of the jars provided in
lib
If you select calculator.CalculatorClient.java and run as "Java Application" you should see
3 + 2=5.0
3 - 2=1.0
3 * 2=6.0
3 / 2=1.5
The details of how to do this for other development environments will
vary but the process will be similar.
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