scala_maven.ScalaScriptMojo Maven / Gradle / Ivy
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The scala-maven-plugin (previously maven-scala-plugin) is used for compiling/testing/running/documenting scala code of any maven project.
package scala_maven;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.StringReader;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.URLClassLoader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.DependencyResolutionRequiredException;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.Plugin;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.classworlds.ClassWorld;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy;
import org.codehaus.plexus.classworlds.strategy.Strategy;
import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.StringUtils;
import scala_maven_executions.JavaMainCaller;
import scala_maven_executions.MainHelper;
/**
* Run a scala script.
*
* @goal script
* @requiresDependencyResolution runtime
* @executionStrategy always
* @since 2.7
* @threadSafe
*/
public class ScalaScriptMojo extends ScalaMojoSupport {
/*
* If the maven-scala-project is a dependency of the project then the
* MavenProject object describing the project will be passed to the script.
*/
/**
* The build directory of the project
*
* @parameter property="project.build.directory"
*/
protected File outputDir;
/**
* The file containing script to be executed. Either 'scriptFile'
* or 'script' must be defined.
*
* @parameter property="scriptFile"
*/
protected File scriptFile;
/**
* The encoding of file containing script to be executed.
*
* @parameter property="scriptEncoding" default-value="UTF-8"
*/
protected String scriptEncoding;
/**
* The script that will be executed. Either 'scriptFile' or '
* script' must be defined.
*
* @parameter property="script"
*/
protected String script;
/**
* If set to true the Scala classfile that is generated will not be deleted
* after the goal completes. This is to allows easier debugging of the
* script especially since line numbers will be wrong because lines are
* added to the compiled script (see script examples)
*
* @parameter property="maven.scala.keepGeneratedScript"
* default-value="false"
*/
protected boolean keepGeneratedScript;
/**
* Comma separated list of scopes to add to the classpath.
* The possible scopes are : test,compile, system, runtime, plugin.
* By default embedded script into pom.xml run with 'plugin' scope
* and script read from scriptFile run with 'compile, test, runtime'
*
* @parameter property="maven.scala.includeScopes"
*/
protected String includeScopes;
/**
* Comma separated list of scopes to remove from the classpath. Eg:
* test,compile
*
* @parameter property="maven.scala.excludeScopes"
*/
protected String excludeScopes;
/**
* Comma seperated list of directories or jars to add to the classpath
*
* @parameter property="addToClasspath"
*/
protected String addToClasspath;
/**
* Comma separated list of directories or jars to remove from the classpath.
* This is useful for resolving conflicts in the classpath. For example, the
* script uses Ant 1.7 and the compiler dependencies pull in Ant 1.5
* optional which conflicts and causes a crash
*
* @parameter property="removeFromClasspath"
*/
protected String removeFromClasspath;
private static AtomicInteger _lastScriptIndex = new AtomicInteger(0);
private static String scriptBaseNameOf(File scriptFile, int idx) {
if (scriptFile == null) {
return "embeddedScript_" + idx;
}
int dot = scriptFile.getName().lastIndexOf('.');
if (dot == -1) {
return scriptFile.getName() + "_" + idx;
}
return scriptFile.getName().substring(0, dot) + "_" + idx;
}
@Override
protected void doExecute() throws Exception {
if (script == null && scriptFile == null) {
throw new MojoFailureException(
"Either script or scriptFile must be defined");
}
if (script != null && scriptFile != null) {
throw new MojoFailureException(
"Only one of script or scriptFile can be defined");
}
if (StringUtils.isEmpty(includeScopes)) {
if (scriptFile != null) {
includeScopes = "compile, test, runtime";
} else {
includeScopes = "plugin";
}
}
if (excludeScopes == null) {
excludeScopes = "";
}
// prepare
File scriptDir = new File(outputDir, ".scalaScriptGen");
scriptDir.mkdirs();
String baseName = scriptBaseNameOf(scriptFile, _lastScriptIndex.incrementAndGet());
File destFile = new File(scriptDir, baseName + ".scala");
Set classpath = new HashSet();
configureClasspath(classpath);
boolean mavenProjectDependency = includeScopes.contains("plugin");
wrapScript(destFile, mavenProjectDependency);
try {
URLClassLoader loader = createScriptClassloader(scriptDir, classpath);
getLog().debug(("classpath : " + Arrays.asList(loader.getURLs())));
compileScript(scriptDir, destFile, loader);
runScript(mavenProjectDependency, loader, baseName);
} finally {
if (!keepGeneratedScript) {
delete(scriptDir);
}
}
}
private void runScript(boolean mavenProjectDependency, URLClassLoader loader, String baseName) throws Exception {
Class compiledScript = loader.loadClass(baseName);
ClassLoader currentCL = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(loader);
try {
try {
Object instance;
if (mavenProjectDependency) {
Constructor constructor = compiledScript.getConstructor(MavenProject.class, MavenSession.class, Log.class);
instance = constructor.newInstance(project, session, getLog());
} else {
instance = compiledScript.newInstance();
}
try {
compiledScript.getMethod("run").invoke(instance);
} catch (NoSuchMethodException e) {
// ignore because if there is no method then its ok and we
// just
// don't run the method. initialization of the class must
// have been
// enough
}
} catch (InvocationTargetException e) {
if (e.getTargetException() != null) {
throw e.getTargetException();
} else if (e.getCause() != null) {
throw e.getCause();
} else {
throw e;
}
} catch (ExceptionInInitializerError e) {
if (e.getException() != null) {
throw e.getException();
} else if (e.getCause() != null) {
throw e.getCause();
} else {
throw e;
}
}
} catch (Throwable e) {
if (e instanceof Exception) {
throw (Exception) e;
}
throw new Exception("A " + e.getClass().getSimpleName() + " exception was thrown", e);
} finally {
Thread.currentThread().setContextClassLoader(currentCL);
}
}
private URLClassLoader createScriptClassloader(File scriptDir, Set classpath) throws Exception {
ClassWorld w = new ClassWorld("zero", null);
w.newRealm("mojo", getClass().getClassLoader());
Strategy s = new SelfFirstStrategy(w.newRealm("scalaScript", null));
ClassRealm rScript = s.getRealm();
rScript.setParentClassLoader(getClass().getClassLoader());
//rScript.importFrom("mojo", MavenProject.class.getPackage().getName());
//rScript.importFrom("mojo", MavenSession.class.getPackage().getName());
//rScript.importFrom("mojo", Log.class.getPackage().getName());
rScript.importFrom("mojo", "org.apache.maven");
// add the script directory to the classpath
rScript.addURL(scriptDir.toURI().toURL());
for (String string : classpath) {
rScript.addURL(new File(string).toURI().toURL());
}
return rScript;
}
private void compileScript(File scriptDir, File destFile, URLClassLoader loader) throws Exception {
JavaMainCaller jcmd = getScalaCommand();
jcmd.addArgs("-classpath", MainHelper.toClasspathString(loader));
jcmd.addArgs("-d", scriptDir.getAbsolutePath());
jcmd.addArgs("-sourcepath", scriptDir.getAbsolutePath());
jcmd.addArgs(destFile.getAbsolutePath());
jcmd.run(displayCmd);
}
private void configureClasspath(Set classpath) throws Exception, DependencyResolutionRequiredException {
Set includes = new TreeSet(Arrays.asList(includeScopes.toLowerCase().split(",")));
Set excludes = new TreeSet(Arrays.asList(excludeScopes.toLowerCase().split(",")));
for(Artifact a : project.getArtifacts()) {
if (includes.contains(a.getScope().toLowerCase()) && !excludes.contains(a.getScope())) {
addToClasspath(a, classpath, true);
}
}
if (includes.contains("plugin") && !excludes.contains("plugin")) {
//Plugin plugin = project.getPlugin("scala-maven-plugin");
for(Plugin p : project.getBuildPlugins()) {
if ("scala-maven-plugin".equals(p.getArtifactId())) {
for(Dependency d : p.getDependencies()) {
addToClasspath(factory.createDependencyArtifact(d), classpath, true);
}
}
}
for(Artifact a : project.getPluginArtifacts()) {
if ("scala-maven-plugin".equals(a.getArtifactId())) {
addToClasspath(a, classpath, true);
}
}
}
if (addToClasspath != null) {
classpath.addAll(Arrays.asList(addToClasspath.split(",")));
}
if (removeFromClasspath != null) {
ArrayList toRemove = new ArrayList();
String[] jars = removeFromClasspath.trim().split(",");
for (String string : classpath) {
for (String jar : jars) {
if (string.contains(jar.trim())) {
toRemove.add(string);
}
}
}
classpath.removeAll(toRemove);
}
// String outputDirectory = project.getBuild().getOutputDirectory();
// if(!outputDirectory.endsWith("/")){
// // need it to end with / for URLClassloader
// outputDirectory+="/";
// }
// classpath.add( outputDirectory);
addCompilerToClasspath(classpath);
addLibraryToClasspath(classpath);
//TODO check that every entry from the classpath exists !
boolean ok = true;
for (String s : classpath) {
File f = new File(s);
getLog().debug("classpath entry for running and compiling scripts: " + f);
if (!f.exists()) {
getLog().error("classpath entry for script not found : " + f);
ok = false;
}
}
if (!ok) {
throw new MojoFailureException("some script dependencies not found (see log)");
}
getLog().debug("Using the following classpath for running and compiling scripts: "+classpath);
}
private void wrapScript(File destFile, boolean mavenProjectDependency) throws IOException {
destFile.delete();
FileOutputStream fileOutputStream = new FileOutputStream(destFile);
PrintStream out = new PrintStream(fileOutputStream, false, encoding);
BufferedReader reader = null;
try {
if (scriptFile != null) {
reader = new BufferedReader(new InputStreamReader(new FileInputStream(scriptFile), Charset.forName(scriptEncoding)));
} else {
reader = new BufferedReader(new StringReader(script));
}
String baseName = FileUtils.basename(destFile.getName(), ".scala");
if (mavenProjectDependency) {
// out.println("import scala.collection.jcl.Conversions._");
out.println("class " + baseName
+ "(project :" + MavenProject.class.getCanonicalName()
+ ",session :" + MavenSession.class.getCanonicalName()
+ ",log :"+Log.class.getCanonicalName()
+") {"
);
} else {
out.println("class " + baseName + " {");
}
String line = reader.readLine();
while (line != null) {
out.print(" ");
out.println(line);
line = reader.readLine();
}
out.println("}");
} finally {
IOUtil.close(out);
IOUtil.close(fileOutputStream);
IOUtil.close(reader);
}
}
private void delete(File scriptDir) {
if (scriptDir.isDirectory()) {
for (File file : scriptDir.listFiles()) {
delete(file);
}
}
scriptDir.deleteOnExit();
scriptDir.delete();
}
}
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