/**
* Compiles the given rule strings into a single rulebase
*
* @param rules
* @return
* @throws Exception
*/
public static RuleBase compile(List<String> rules) throws Exception {
Properties properties = new Properties();
properties.setProperty("drools.dialect.java.compiler", "JANINO");
properties.setProperty("drools.dialect.default", "java");
properties.setProperty("drools.dialect.java.compiler.lnglevel", "1.5");
// properties.setProperty("drools.dump.dir", "/tmp");
// log.debug("drools.dump.dir value is set to " + dumpDir);
PackageBuilderConfiguration conf = new PackageBuilderConfiguration(properties);
PackageBuilder builder = new PackageBuilder(conf);
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
for (String rule : rules) {
StringReader drl = new StringReader(rule);
builder.addPackageFromDrl(drl);
PackageBuilderErrors errors = builder.getErrors();
for (DroolsError error : errors.getErrors()) {
log.warn(error);
}
}
ruleBase.addPackage(builder.getPackage());
return ruleBase;
}
public void execute() throws MojoExecutionException {
// find all the rules items and load them into a package
try {
// Need to load the build classpath
@SuppressWarnings("unchecked")
List<Dependency> dependencies = project.getDependencies();
List<URL> url = new ArrayList<URL>();
url.add(outputDirectory.toURI().toURL());
for (Dependency d : dependencies) {
String scope = d.getScope();
if (!Artifact.SCOPE_TEST.equals(scope)) {
Artifact artifact =
getArtifact(
d.getGroupId(),
d.getArtifactId(),
d.getVersion(),
d.getType(),
d.getClassifier());
url.add(artifact.getFile().toURI().toURL());
}
}
URL[] classpath = url.toArray(new URL[url.size()]);
URLClassLoader uc =
new URLClassLoader(classpath, this.getClass().getClassLoader()) {
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
getLog().debug("Loading Class for compile [" + name + "]");
Class<?> c = super.loadClass(name);
getLog().debug("Loading Class for compile [" + name + "] found [" + c + "]");
return c;
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
getLog().debug("Finding Class for compile [" + name + "]");
Class<?> c = super.findClass(name);
getLog().debug("Finding Class for compile [" + name + "] found [" + c + "]");
return c;
}
};
URLClassLoader uc2 =
new URLClassLoader(classpath, this.getClass().getClassLoader()) {
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
getLog().debug("Loading Class for runtime [" + name + "]");
Class<?> c = super.loadClass(name);
getLog().debug("Loading Class for runtime [" + name + "] found [" + c + "]");
return c;
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
getLog().debug("Finding Class for runtime [" + name + "]");
Class<?> c = super.findClass(name);
getLog().debug("Finding Class for runtime [" + name + "] found [" + c + "]");
return c;
}
};
getLog().info("Package Class loader is using classpath " + Arrays.toString(uc.getURLs()));
listClassloader(" ", uc);
PackageBuilderConfiguration packageBuilderConfiguration = new PackageBuilderConfiguration(uc);
PackageBuilder pb = new PackageBuilder(packageBuilderConfiguration);
DirectoryScanner ds = new DirectoryScanner();
ds.setIncludes(includes);
ds.setExcludes(excludes);
ds.setBasedir(rulesdir);
ds.setCaseSensitive(true);
ds.scan();
String[] files = ds.getIncludedFiles();
for (String file : files) {
File f = new File(rulesdir, file);
Reader reader = new FileReader(f);
try {
if (file.endsWith(".drl")) {
getLog().info("Adding Rules " + f);
pb.addPackageFromDrl(reader);
} else if (file.endsWith(".xml")) {
getLog().info("Adding Package definition " + f);
pb.addPackageFromXml(reader);
} else if (file.endsWith(".rf")) {
getLog().info("Adding Rule Flow " + f);
pb.addRuleFlow(reader);
} else {
getLog().info("Ignored Resource " + f);
}
} finally {
reader.close();
}
}
pb.compileAll();
PackageBuilderErrors errors = pb.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError kberr : errors) {
getLog().error(kberr.toString());
}
throw new MojoExecutionException("Package is not valid");
}
org.drools.rule.Package p = pb.getPackage();
if (!p.isValid()) {
getLog().error("Package is not valid ");
throw new MojoExecutionException("Package is not valid");
}
File outputFile = getOutputFile();
getLog().info("Saving compiled package to " + outputFile.getPath());
outputFile.getParentFile().mkdirs();
FileOutputStream fout = new FileOutputStream(outputFile);
DroolsStreamUtils.streamOut(fout, p);
fout.close();
getLog().info("Testing Compiled package " + outputFile.getPath());
File inputFile = getOutputFile();
FileInputStream fin = new FileInputStream(inputFile);
RuleBaseConfiguration config = new RuleBaseConfiguration(uc2);
RuleBase ruleBase = RuleBaseFactory.newRuleBase(config);
Object o = DroolsStreamUtils.streamIn(fin, uc);
ruleBase.addPackage((Package) o);
KnowledgeBase kb = new KnowledgeBaseImpl(ruleBase);
@SuppressWarnings("unused")
StatelessKnowledgeSession session = kb.newStatelessKnowledgeSession();
getLog().info("Testing passed ");
} catch (Exception e) {
getLog().error(e);
throw new MojoExecutionException(e.getMessage());
}
}