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Calculator Implementation Policies Sample
=========================================
This sample builds over simple calculator sample to demonstrate how Implementation Policies can
be use in Tuscany SCA Java.
The README in the samples directory (the directory above this) provides
general instructions about building and running samples. Take a look there
first.
If you just want to run the sample to see what happens open a command prompt, navigate
to this sample directory and do:
ant run
OR if you don't have ant, on Windows do
java -cp ..\..\lib\tuscany-sca-manifest.jar;target\sample-calculator.jar calculator.CalculatorClient
and on *nix do
java -cp ../../lib/tuscany-sca-manifest.jar:target/sample-calculator.jar calculator.CalculatorClient
Sample Overview
---------------
The sample provides the calculator service with a default SCA (java) binding. The 'logging' policy
which is handled by the Tuscany SCA java policy-logging module is used in this calculator
composite to specify the need for 'logging'. The MultiplyService Component specifies for 'jassAuthentication'
which is one way of implemention login authentication, using the Java Authentication and Authorization Service.
The logging intent and policyset that is to be used by this calculator application must be
defined in the definitions.xml file. Here we use the policyset structure already defined in
Tuscany for logging under the policy-logging and hence there is no need to specify the policyset processors
and policy handler classes as part of this application.
Similarly the jaasAuthentication intent and policyset also is defined in the definitions.xml file
of this sample. This sample uses the calculator.security.JaasLoginModule class for handling the
authentication functions. Right now there is a simply matching of userid and passwords that happens in this
class. Applications could implement their own sophisticated authentication mechanisms. For more information
on how to do this please look up Java Authentication and Authorization Service documentation. The sample
also use the calculator.security.CalculatorCallbackHandler to fetch the userid and password to be use for the
login authentication. This handler presently uses hardcoded userids and passwords. Applications could
typically use this handler to prompt for userid and passwords.
There are two components that provide the calculator service namely 'CalculatorServiceComponent'
and 'AnotherCalculatorServiceComponent'. The logging intent is specified for the 'subtract' and 'divide'
operations of the 'CalculatorServiceCompnent' implementation, and on the entire implementation
(i.e. all operations) for the AddServiceComponent and AnotherCalculatorServiceComponent.
The CalculatorClient first exercises the CalculatorServiceComponent calling add,
subtract, multiply and divide operations. This results in logging messages appearing on the
console for 'add', 'subtract' and 'divide' operations. The CalculatorClient then exercises the
AnotherCalculatorServiceComponent calling all the service methods. This will result in logging messages
printed on the console for all the operations. For the 'add' operation there will be two sets of messages
printed - one that has resulted from specifying the 'logging' intent on the implementation element of the
'AnotherCalculatorServiceComponent' and another from specifying the 'logging' intent on the
'AddServiceComponent'
The jaasAuthentication intent is specified for the 'MultiplyServiceComponent'. So everytime this component
is invoke an authentication is attempted and only if it succeeds, is the multiply function is invoked. The
console prints messages that denote if the authentication has succeeded or failed.
Thus this sample demonstrates how intents could be applied to either implementations as a whole or to some
selective operations on an implementation.
calculator/
src/
main/
java/
calculator/
CalculatorService.java - the first component, calls +-/* as
appropriate
CalculatorServiceImpl.java
AddService.java - adds two numbers
AddServiceImpl.java
SubtractService.java - subtracts one number from another
SubtractServiceImpl.java
MultiplyService.java - multiplies two numbers
MultiplyServiceImpl.java
DivideService.java - divides one number by another
DivideServiceImpl.java
CalculatorClient.java - starts the SCA Runtime and
deploys the Calculator.composite.
It then calls the deployed Calculator
Components services
calculator/security
JaasLoginModule.java JaasLoginModule implementation for this sample
CalculatorCallbackHandler.java JAAS callbackhandler for fetching userid and password
resources/
Calculator.composite - the SCA assembly for this sample
definitions.xml - sca definitions file that defines the 'logging' intent
and policyset
used by this application
CalculatorLogMessages.properties - A resource bundle contain the log messages to be
used.
CalculatorJaas.config - JAAS Login Configuration file
test/
java/
calculator/
CalculatorTestCase.java - JUnit test case
calculator.png - a pictorial representation of the sample
.composite file
build.xml - the Ant build file
pom.xml - the Maven build file
Building And Running The Sample Using Ant
-----------------------------------------
With the binary distribution the sample can be built and run using Ant as
follows
cd calculator-implementation-policies
ant compile
ant run
You should see the following output from the run target.
run:
[java] Calling CalculatorServiceComponent configured with 'logging' policy for subtract and divide operations...
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Invoking operation - add
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - add
[java] 3 + 2=5.0
[java] 3 - 2=1.0
[java] 3 * 2=6.0
[java] 3 / 2=1.5
[java] Calling CalculatorServiceComponent configured with 'logging' for all operations in the implementation...
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Invoking operation - subtract
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - subtract
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Invoking operation - divide
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - divide
[java] Nov 23, 2007 1:06:10 PM
[java] 3 + 2=5.0
[java] 3 - 2=1.0
[java] 3 * 2=6.0
[java] INFO: Invoking operation - add
[java] 3 / 2=1.5
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Invoking operation - add
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - add
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - add
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Invoking operation - subtract
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - subtract
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Invoking operation - multiply
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - multiply
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Invoking operation - divide
[java] Nov 23, 2007 1:06:10 PM
[java] INFO: Returned from operation - divide
Building And Running The Sample Using Maven
-------------------------------------------
With either the binary or source distributions the sample can be built and run
using Maven as follows.
cd calculator
mvn
You should see the following output from the test phase. Notice the log messages.
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running calculator.CalculatorTestCase
Dec 18, 2007 12:05:06 PM org.apache.tuscany.sca.contribution.processor.ValidatingXMLStreamReader$1 error
WARNING: XMLSchema validation problem in: file:/F:/LatestTrunk/sca/samples/calculator-implementation-policies/target/
classes/Calculator.composite, line: 28, column: 4
cvc-complex-type.2.4.a: Invalid content was found starting with element 'operation'. One of '{WC[##other:"http://www.
osoa.org/xmlns/sca/1.0"]}' is expected.
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - add
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation add with arguments 3.0, 2.0,
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - add
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation add with return value 5
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - subtract
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation subtract with arguments 3.0, 2.0,
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - subtract
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation subtract with return value 1
Successfully AUTHENTICATED!!
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - divide
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation divide with arguments 3.0, 2.0,
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - divide
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation divide with return value 1.5
Dec 18, 2007 12:05:06 PM org.apache.tuscany.sca.contribution.processor.ValidatingXMLStreamReader$1 error
WARNING: XMLSchema validation problem in: file:/F:/LatestTrunk/sca/samples/calculator-implementation-policies/target/
classes/Calculator.composite, line: 28, column: 4
cvc-complex-type.2.4.a: Invalid content was found starting with element 'operation'. One of '{WC[##other:"http://www.
osoa.org/xmlns/sca/1.0"]}' is expected.
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - add
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation add with arguments 3.0, 2.0,
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - add
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation add with arguments 3.0, 2.0,
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - add
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation add with return value 5
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - add
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation add with return value 5
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - subtract
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation subtract with arguments 3.0, 2.0,
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - subtract
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation subtract with return value 1
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - multiply
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation multiply with arguments 3.0, 2.0,
Successfully AUTHENTICATED!!
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - multiply
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation multiply with return value 6
Dec 18, 2007 12:05:06 PM
INFO: Invoking operation - divide
Dec 18, 2007 12:05:06 PM
FINER: Inovoking operation divide with arguments 3.0, 2.0,
Dec 18, 2007 12:05:06 PM
INFO: Returned from operation - divide
Dec 18, 2007 12:05:06 PM
FINER: Returning from operation divide with return value 1.5
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.823 sec
Results :
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
Results :
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
This shows that the Junit test cases have run successfully.
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