Compile and run the script only once.

This should fix issue #116

src/main/java/de/thetaphi/forbiddenapis/gradle/ForbiddenApisPlugin.java

@@ -19,6 +19,7 @@
 import groovy.lang.Binding;
 import groovy.lang.GroovyCodeSource;
 import groovy.lang.GroovyShell;
+import groovy.lang.Script;
 import groovy.util.DelegatingScript;
 
 import java.net.URL;
@@ -45,22 +46,30 @@ public class ForbiddenApisPlugin implements Plugin<Project> {
  /** Name of the extension to define defaults for all tasks of this module. */
  public static final String FORBIDDEN_APIS_EXTENSION_NAME = "forbiddenApis";
 
- @Override
- public void apply(final Project project) {
+ private final Script script;
+
+ public ForbiddenApisPlugin() {
  final ImportCustomizer importCustomizer = new ImportCustomizer().addStarImports(ForbiddenApisPlugin.class.getPackage().getName());
  final CompilerConfiguration configuration = new CompilerConfiguration().addCompilationCustomizers(importCustomizer);
  configuration.setScriptBaseClass(DelegatingScript.class.getName());
  configuration.setSourceEncoding("UTF-8");
- final Binding binding = new Binding(Collections.singletonMap("project", project));
- final GroovyShell shell = new GroovyShell(ForbiddenApisPlugin.class.getClassLoader(), binding, configuration);
+ final GroovyShell shell = new GroovyShell(ForbiddenApisPlugin.class.getClassLoader(), new Binding(), configuration);
  final URL scriptUrl = ForbiddenApisPlugin.class.getResource(PLUGIN_INIT_SCRIPT);
  if (scriptUrl == null) {
  throw new PluginInstantiationException("Cannot find resource with script: " + PLUGIN_INIT_SCRIPT);
  }
  final GroovyCodeSource csrc = new GroovyCodeSource(scriptUrl);
  final DelegatingScript script = (DelegatingScript) shell.parse(csrc);
  script.setDelegate(this);
+ this.script = script;
+ }
+
+ // synchronized because we change the property "project" in the binding
+ @Override
+ public synchronized void apply(Project project) {
+ script.setProperty("project", project);
  script.run();
+ script.setProperty("project", null);
  }
 
 }