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Drools Server

Usage

Build

mvn clean install

This will build the fat jar, the fat shell script and install the script in ~/bin/drools-server.

Sample decision table and types

Excel sheet doc/rules/ExamplePolicyPricing.xls

IMPORTANT: The Excel sheet must import in RuleSet cell D2 the model package io.quicksign.drools.server, it should be changed to reflect your company but must match the package exported from Types.drl file.

ExamplePolicyPricing.xls

Fact types doc/rules/Types.drl

package io.quicksign.drools.server

declare Driver
    name : String = "Mr Joe Blogs"
    age : Integer = new Integer(30)
    priorClaims : Integer = new Integer(0)
    locationRiskProfile : String = "LOW"
end

declare Policy
    type : String = "COMPREHENSIVE";
    approved : boolean = false;
    discountPercent : int = 0;
    basePrice : int;
end

IMPORTANT: The io.quicksign.drools.server can be changed be must be matched by the packaged imported in the Excel file. See RuleSet cell D2.

Start the server

Given the sample decision table and facts are in doc/rules/ :

  • Installed shell script from ~/bin: drools-server --drools.folder=$PWD/doc/rules
  • Shell script from ./target dir: ./target/drools-server.sh --drools.folder=$PWD/doc/rules
  • Executable JAR: java -Ddrools.folder=$PWD/doc/rules -jar target/drools-server-1.0-SNAPSHOT.jar

Test the rules

With Swagger UI :

At http://localhost:8080/swagger-ui.html

Sample facts request body :

[
    {
        "_type": "io.quicksign.drools.server.Driver",
        "age": 30,
        "priorClaims": 0,
        "locationRiskProfile": "LOW"
    },
    {
        "_type": "io.quicksign.drools.server.Policy"
    }
]

With Curl

curl -X POST "http://localhost:8080/" \
	-H "Content-Type: application/json" \
	-d "[{ \"_type\": \"io.quicksign.drools.server.Driver\", \"age\": 30, \"priorClaims\": 0, \"locationRiskProfile\": \"LOW\"}, { \"_type\": \"io.quicksign.drools.server.Policy\" } ]"

It should return the following :

[
    {
        "_type": "io.quicksign.drools.server.Driver",
        "age": 30,
        "priorClaims": 0,
        "locationRiskProfile": "LOW"
    },
    {
        "_type": "io.quicksign.drools.server.Policy",
        "approved": false,
        "discountPercent": 20,
        "type": "COMPREHENSIVE",
        "basePrice": 120
    }
]

Experimental RFC 6902 JSON Patch support

The endpoint URL is /_diff :

curl -X POST "http://localhost:8080/_diff" \
	-H "Content-Type: application/json" \
	-d "[{ \"_type\": \"io.quicksign.drools.server.Driver\", \"age\": 30, \"priorClaims\": 0, \"locationRiskProfile\": \"LOW\"}, { \"_type\": \"io.quicksign.drools.server.Policy\" } ]"

It should return the following :

[
  {
    "op": "add",
    "path": "/1/approved",
    "value": false
  },
  {
    "op": "add",
    "path": "/1/basePrice",
    "value": 120
  },
  {
    "op": "add",
    "path": "/1/discountPercent",
    "value": 20
  },
  {
    "op": "add",
    "path": "/1/type",
    "value": "COMPREHENSIVE"
  }
]

NB: For this example, the JSON Patch uses only 10% less bytes than the plain JSON which is not great but compresses better. The gzip compressed JSON Patch uses 30% less bytes than the gzip compressed plain JSON.