Package org.apache.storm.sql.javac
Class CompilingClassLoader
java.lang.Object
java.lang.ClassLoader
org.apache.storm.sql.javac.CompilingClassLoader
This is a Java ClassLoader that will attempt to load a class from a string of source code.
 
 
Example
 String className = "com.foo.MyClass";
 String classSource =
   "package com.foo;\n" +
   "public class MyClass implements Runnable {\n" +
   "  @Override public void run() {\n" +
   "   log(\"Hello world\");\n" +
   "  }\n" +
   "}";
 // Load class from source.
 ClassLoader classLoader = new CompilingClassLoader(
     parentClassLoader, className, classSource);
 Class myClass = classLoader.loadClass(className);
 // Use it.
 Runnable instance = (Runnable)myClass.newInstance();
 instance.run();
 
 
 Only one chunk of source can be compiled per instance of CompilingClassLoader. If you need to compile more, create multiple
 CompilingClassLoader instances.
 
 Uses Java 1.6's in built compiler API.
 
 If the class cannot be compiled, loadClass() will throw a ClassNotFoundException and log the compile errors to System.err. If you don't
 want the messages logged, or want to explicitly handle the messages you can provide your own DiagnosticListener
 through {#setDiagnosticListener()}.
 - See Also:
- 
Nested Class SummaryNested ClassesModifier and TypeClassDescriptionstatic classThrown when code cannot be compiled.
- 
Constructor SummaryConstructorsConstructorDescriptionCompilingClassLoader(ClassLoader parent, String className, String sourceCode, DiagnosticListener<JavaFileObject> diagnosticListener) Constructor.
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Method SummaryMethods inherited from class java.lang.ClassLoaderclearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findResource, findResources, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners
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Constructor Details- 
CompilingClassLoaderpublic CompilingClassLoader(ClassLoader parent, String className, String sourceCode, DiagnosticListener<JavaFileObject> diagnosticListener) throws CompilingClassLoader.CompilerException Constructor.- Parameters:
- parent- Parent classloader to resolve dependencies from.
- className- Name of class to compile. eg. "com.foo.MyClass".
- sourceCode- Java source for class. e.g. "package com.foo; class MyClass { ... }".
- diagnosticListener- Notified of compiler errors (may be null).
- Throws:
- CompilingClassLoader.CompilerException
 
 
- 
- 
Method Details- 
getClasses
- 
findClassOverride ClassLoader's class resolving method. Don't call this directly, instead useClassLoader.loadClass(String).- Overrides:
- findClassin class- ClassLoader
- Throws:
- ClassNotFoundException
 
 
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