Drools 7 ObjectDataCompiler

ObjectDataCompiler 是用于将一个java 对象填充到template 内生成drl。

• 实际是转为String对象，父类为DataProviderCompiler
• 要注意对象值为空的处理，如果填充遇到null，会导致rule很奇怪。

测试java 代码如下

public class ObjectDataCompilerTest {
    private static final Logger LOGGER = LoggerFactory.getLogger(ObjectDataCompilerTest.class);
    public static   void main(String[] args) {
        ObjectDataCompilerTest test=new ObjectDataCompilerTest();
        try {
            test.loadingFromDLRArrayCorrectnessCheck( );
            test.TenTemplatesManyRules();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }
    public void loadingFromDLRArrayCorrectnessCheck() throws Exception {
        final String[][] rows = new String[3][6];
        rows[0] = new String[]{"tomato", "weight", "200", "1000", "6", "== Taste.GOOD || == Taste.EXCELENT"};
        rows[1] = new String[]{"cucumber", "length", "20", "40", "15", "== Taste.EXCELENT"};
        rows[2] = new String[]{"carrot", "weight", "0", "1000", "2", "== Taste.HORRIBLE"};

        final ArrayDataProvider adp = new ArrayDataProvider(rows);

        final DataProviderCompiler converter = new DataProviderCompiler();
        try (InputStream resourceStream = KieServices.Factory.get().getResources().newClassPathResource("template_1.drl", getClass()).getInputStream()) {
            final String drl = converter.compile(adp, resourceStream);

            // prints rules generated from template
            System.out.println(drl);

//            assertEqualsIgnoreWhitespace(EXPECTED_RULES.toString(), drl);

//            testCorrectnessCheck(drl);
        }
    }

    public void TenTemplatesManyRules() throws IOException {
        final KieServices kieServices = KieServices.Factory.get();
        final ObjectDataCompiler converter = new ObjectDataCompiler();
        try (InputStream resourceStream = kieServices.getResources().newClassPathResource("template_2.drl", getClass()).getInputStream()) {
            final String drl = converter.compile(
                    generateParamSetCollection(5),
                    resourceStream);

            // prints rules generated from template
            System.out.println(drl);

            //testManyRules(drl, 500);
        }
    }

    private Collection<ParamSet> generateParamSetCollection(final int loops) {
        final Collection<ParamSet> result = new ArrayList<>();
        for (int i = 0; i < loops; i++) {
            result.add(new ParamSet("tomato", "weight", 200, (1000 + i), 6, EnumSet.of(Taste.GOOD, Taste.EXCELENT)));
            result.add(new ParamSet("tomato", "weight", 100, (500 + i), 6, EnumSet.of(Taste.BAD)));
            result.add(new ParamSet("tomato", "length", 5, (10 + i), 6, EnumSet.of(Taste.AVERAGE)));
            result.add(new ParamSet("tomato", "weight", 300, (4000 + i), 6, EnumSet.of(Taste.GOOD, Taste.EXCELENT)));
            result.add(new ParamSet("tomato", "weight", 200, (6000 + i), 6, EnumSet.of(Taste.EXCELENT)));
            result.add(new ParamSet("tomato", "length", 2, (4 + i), 6, EnumSet.of(Taste.AVERAGE, Taste.GOOD)));
            result.add(new ParamSet("tomato", "weight", 100, (1000 + i), 6, EnumSet.of(Taste.GOOD)));
            result.add(new ParamSet("tomato", "weight", 500, (1000 + i), 6, EnumSet.of(Taste.EXCELENT)));
            result.add(new ParamSet("tomato", "length", 4, (15 + i), 6, EnumSet.of(Taste.AVERAGE, Taste.EXCELENT)));
            result.add(new ParamSet("tomato", "weight", 200, (1000 + i), 6, EnumSet.of(Taste.GOOD, Taste.EXCELENT)));
        }
        return result;
    }