Quickstart
github | jenkins | dockerhub |
# pull the code git pull https://github.com/obrienlabs/calculator.git # build cd calculator biometric:calculator michaelobrien$ mvn clean install -U # optionally build docker image biometric:calculator michaelobrien$ cd calculator-cli/src/docker/ biometric:docker michaelobrien$ ./build.sh biometric:docker michaelobrien$ cd ../../ biometric:calculator-cli michaelobrien$ java -cp target/tools.obrien.calculator-cli.jar tools.obrien.calculator.Calculator "add(1, add(2,3))" # options (add, div, mult, sub) java -cp target/tools.obrien.calculator-cli.jar tools.obrien.calculator.Calculator "add(1, add(2,3))" java -cp target/tools.obrien.calculator-cli.jar tools.obrien.calculator.Calculator "add(1, div(2,3))" java -cp target/tools.obrien.calculator-cli.jar tools.obrien.calculator.Calculator "add(1, mult(2,3))" java -cp target/tools.obrien.calculator-cli.jar tools.obrien.calculator.Calculator "add(1, sub(2,3))"
Requirements
Lexical inputs are command - not token based. No "2 * 5" - use "mult(2, 5)"
Keywords: add, mult, div sub
expressions: 2 parameters max including recursive keyword expressions - "add(1, mult(2,5))
Analysis
There are several methods for parting mathematical expressions. The most common that comes to mind is RPN (reverse polish notation) - where we had to enter the calculations in RPN or post order binary tree traversal.
Operations
input: add (1,2)
push "add" to the operation stack
on open bracket
push 1,2 to parameter stack
on close bracket - execute last operation stack item
Multiple passes
recursively iterate the string and evaluate ( ) expressions at the deepest level outwards
add(1, add(2,3))
add(1, 5)
6
Test Driven Design Use Cases
Base case operation
Recursive case operation
Design
Execution Phases
Token parsing
Operation parsing
Expression parsing
Calculation
Testing
Logging
Implementation
Usage
Running the calculator via native JDK
# clone # build $mvn clean install -U [INFO] calculator ......................................... SUCCESS [ 0.246 s] [INFO] calculator-cli ..................................... SUCCESS [ 3.563 s] [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3.891 s [INFO] Finished at: 2020-02-09T16:05:23-05:00 [INFO] ------------------------------------------------------------------------ biometric:calculator michaelobrien$ java -cp calculator-cli/target/tools.obrien.calculator-cli.jar tools.obrien.calculator.Calculator "add(1, add(2,3))" Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator parse INFO: expression: add(1, add(2,3)) Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator tokenize INFO: token: add Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator tokenize INFO: token: 1 Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator tokenize INFO: token: add Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator tokenize INFO: token: 2 Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator tokenize INFO: token: 3 Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator parse INFO: result: 6.0 Feb. 09, 2020 4:05:28 P.M. tools.obrien.calculator.Calculator main INFO: Result: 6.0
Running the calculator via docker image
cd calculator/calculator-cli/src/docker biometric:docker michaelobrien$ ./build.sh mkdir: ../../builds: File exists mkdir: ../../builds/10001: File exists Sending build context to Docker daemon 10.75kB Step 1/6 : FROM openjdk:11 ---> 243e95d792e3 Step 2/6 : ARG USERVICE_HOME=/opt/app/ ---> Running in fd38a4fa02e5 Removing intermediate container fd38a4fa02e5 ---> d3653a1c68f3 Step 3/6 : RUN mkdir -p $USERVICE_HOME ---> Running in 520b741b1f79 Removing intermediate container 520b741b1f79 ---> efba67b46f12 Step 4/6 : ADD tools.obrien.calculator-cli.jar $USERVICE_HOME/lib/tools.obrien.calculator-cli.jar ---> e30f348bda35 Step 5/6 : ADD startService.sh $USERVICE_HOME/bin/ ---> 02768f79a7a6 Step 6/6 : CMD ["/opt/app/bin/startService.sh"] ---> Running in 74950f567b96 Removing intermediate container 74950f567b96 ---> e7ffc7cf65fb [Warning] One or more build-args [build-id] were not consumed Successfully built e7ffc7cf65fb Successfully tagged obrienlabs/calculator-cli:latest The push refers to repository [docker.io/obrienlabs/calculator-cli] daf5d66e7e8b: Pushed b108c3ea5097: Pushed 0a9f15a148f0: Pushed 25efa461ccff: Layer already exists 4272c5799ff4: Layer already exists 9a11244a7e74: Layer already exists 5f3a5adb8e97: Layer already exists 73bfa217d66f: Layer already exists 91ecdd7165d3: Layer already exists e4b20fcc48f4: Layer already exists 0.0.1: digest: sha256:d5a8b1d8a07b4af49c9421f8df6aca407ce8e9f2552308e511fdd76bc3266dc1 size: 2417 calculator-cli calculator-cli starting: calculator-cli 2cb387cb2f175918d128126e975aeb2e1b4cd6c843a64bb7f8658ff30fc7dbf0 biometric:docker michaelobrien$ docker logs calculator-cli Feb 10, 2020 3:40:56 AM tools.obrien.calculator.Calculator parse INFO: expression: add(2,3) Feb 10, 2020 3:40:56 AM tools.obrien.calculator.Calculator tokenize INFO: token: add Feb 10, 2020 3:40:56 AM tools.obrien.calculator.Calculator tokenize INFO: token: 2 Feb 10, 2020 3:40:56 AM tools.obrien.calculator.Calculator tokenize INFO: token: 3 Feb 10, 2020 3:40:56 AM tools.obrien.calculator.Calculator parse INFO: result: 5.0 Feb 10, 2020 3:40:56 AM tools.obrien.calculator.Calculator main INFO: Result: 5.0 biometric:docker michaelobrien$ docker ps -a | grep calculator df6d8ff37e3e obrienlabs/calculator-cli:0.0.1 "jshell" About a minute ago Exited (0) About a minute ago calculator-cli
