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From sn...@apache.org
Subject [2/3] cassandra git commit: Merge branch 'cassandra-2.2' into cassandra-3.0
Date Mon, 09 Nov 2015 11:47:09 GMT
Merge branch 'cassandra-2.2' into cassandra-3.0


Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/f2af290c
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/f2af290c
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/f2af290c

Branch: refs/heads/trunk
Commit: f2af290c53d88df5d9c07fbfacc7e34bf886a1b4
Parents: 96f407b b5b1252
Author: Robert Stupp <snazy@snazy.de>
Authored: Mon Nov 9 12:44:41 2015 +0100
Committer: Robert Stupp <snazy@snazy.de>
Committed: Mon Nov 9 12:45:39 2015 +0100

----------------------------------------------------------------------
 .../cassandra/cql3/functions/JavaBasedUDFunction.java  | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cassandra/blob/f2af290c/src/java/org/apache/cassandra/cql3/functions/JavaBasedUDFunction.java
----------------------------------------------------------------------
diff --cc src/java/org/apache/cassandra/cql3/functions/JavaBasedUDFunction.java
index 0fb8123,0000000..0c1ee64
mode 100644,000000..100644
--- a/src/java/org/apache/cassandra/cql3/functions/JavaBasedUDFunction.java
+++ b/src/java/org/apache/cassandra/cql3/functions/JavaBasedUDFunction.java
@@@ -1,628 -1,0 +1,639 @@@
 +/*
 + * Licensed to the Apache Software Foundation (ASF) under one
 + * or more contributor license agreements.  See the NOTICE file
 + * distributed with this work for additional information
 + * regarding copyright ownership.  The ASF licenses this file
 + * to you under the Apache License, Version 2.0 (the
 + * "License"); you may not use this file except in compliance
 + * with the License.  You may obtain a copy of the License at
 + *
 + *     http://www.apache.org/licenses/LICENSE-2.0
 + *
 + * Unless required by applicable law or agreed to in writing, software
 + * distributed under the License is distributed on an "AS IS" BASIS,
 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 + * See the License for the specific language governing permissions and
 + * limitations under the License.
 + */
 +
 +package org.apache.cassandra.cql3.functions;
 +
 +import java.io.ByteArrayOutputStream;
 +import java.io.IOException;
 +import java.io.InputStream;
 +import java.lang.invoke.MethodHandle;
 +import java.lang.invoke.MethodHandles;
 +import java.lang.invoke.MethodType;
 +import java.lang.reflect.InvocationTargetException;
++import java.lang.reflect.Method;
 +import java.net.*;
 +import java.nio.ByteBuffer;
 +import java.security.*;
 +import java.security.cert.Certificate;
 +import java.util.*;
 +import java.util.concurrent.ConcurrentHashMap;
 +import java.util.concurrent.ExecutorService;
 +import java.util.concurrent.ThreadLocalRandom;
 +import java.util.concurrent.atomic.AtomicInteger;
 +
 +import com.google.common.io.ByteStreams;
 +import org.slf4j.Logger;
 +import org.slf4j.LoggerFactory;
 +
 +import com.datastax.driver.core.DataType;
 +import org.apache.cassandra.concurrent.NamedThreadFactory;
 +import org.apache.cassandra.cql3.ColumnIdentifier;
 +import org.apache.cassandra.db.marshal.AbstractType;
 +import org.apache.cassandra.exceptions.InvalidRequestException;
 +import org.apache.cassandra.utils.FBUtilities;
 +import org.eclipse.jdt.core.compiler.IProblem;
 +import org.eclipse.jdt.internal.compiler.*;
 +import org.eclipse.jdt.internal.compiler.Compiler;
 +import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
 +import org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException;
 +import org.eclipse.jdt.internal.compiler.env.ICompilationUnit;
 +import org.eclipse.jdt.internal.compiler.env.INameEnvironment;
 +import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;
 +import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
 +import org.eclipse.jdt.internal.compiler.problem.DefaultProblemFactory;
 +
 +final class JavaBasedUDFunction extends UDFunction
 +{
 +    private static final String BASE_PACKAGE = "org.apache.cassandra.cql3.udf.gen";
 +
 +    static final Logger logger = LoggerFactory.getLogger(JavaBasedUDFunction.class);
 +
 +    private static final AtomicInteger classSequence = new AtomicInteger();
 +
 +    // use a JVM standard ExecutorService as DebuggableThreadPoolExecutor references internal
 +    // classes, which triggers AccessControlException from the UDF sandbox
 +    private static final UDFExecutorService executor =
 +        new UDFExecutorService(new NamedThreadFactory("UserDefinedFunctions",
 +                                                      Thread.MIN_PRIORITY,
 +                                                      udfClassLoader,
 +                                                      new SecurityThreadGroup("UserDefinedFunctions",
null, UDFunction::initializeThread)),
 +                               "userfunction");
 +
 +    private static final EcjTargetClassLoader targetClassLoader = new EcjTargetClassLoader();
 +
 +    private static final UDFByteCodeVerifier udfByteCodeVerifier = new UDFByteCodeVerifier();
 +
 +    private static final ProtectionDomain protectionDomain;
 +
 +    private static final IErrorHandlingPolicy errorHandlingPolicy = DefaultErrorHandlingPolicies.proceedWithAllProblems();
 +    private static final IProblemFactory problemFactory = new DefaultProblemFactory(Locale.ENGLISH);
 +    private static final CompilerOptions compilerOptions;
 +
 +    /**
 +     * Poor man's template - just a text file splitted at '#' chars.
 +     * Each string at an even index is a constant string (just copied),
 +     * each string at an odd index is an 'instruction'.
 +     */
 +    private static final String[] javaSourceTemplate;
 +
 +    static
 +    {
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/Class", "forName");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/Class", "getClassLoader");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/Class", "getResource");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/Class", "getResourceAsStream");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "clearAssertionStatus");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "getResource");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "getResourceAsStream");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "getResources");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "getSystemClassLoader");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "getSystemResource");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "getSystemResourceAsStream");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "getSystemResources");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "loadClass");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "setClassAssertionStatus");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "setDefaultAssertionStatus");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/lang/ClassLoader", "setPackageAssertionStatus");
 +        udfByteCodeVerifier.addDisallowedMethodCall("java/nio/ByteBuffer", "allocateDirect");
 +
 +        Map<String, String> settings = new HashMap<>();
 +        settings.put(CompilerOptions.OPTION_LineNumberAttribute,
 +                     CompilerOptions.GENERATE);
 +        settings.put(CompilerOptions.OPTION_SourceFileAttribute,
 +                     CompilerOptions.DISABLED);
 +        settings.put(CompilerOptions.OPTION_ReportDeprecation,
 +                     CompilerOptions.IGNORE);
 +        settings.put(CompilerOptions.OPTION_Source,
 +                     CompilerOptions.VERSION_1_8);
 +        settings.put(CompilerOptions.OPTION_TargetPlatform,
 +                     CompilerOptions.VERSION_1_8);
 +
 +        compilerOptions = new CompilerOptions(settings);
 +        compilerOptions.parseLiteralExpressionsAsConstants = true;
 +
 +        try (InputStream input = JavaBasedUDFunction.class.getResource("JavaSourceUDF.txt").openConnection().getInputStream())
 +        {
 +            ByteArrayOutputStream output = new ByteArrayOutputStream();
 +            FBUtilities.copy(input, output, Long.MAX_VALUE);
 +            String template = output.toString();
 +
 +            StringTokenizer st = new StringTokenizer(template, "#");
 +            javaSourceTemplate = new String[st.countTokens()];
 +            for (int i = 0; st.hasMoreElements(); i++)
 +                javaSourceTemplate[i] = st.nextToken();
 +        }
 +        catch (IOException e)
 +        {
 +            throw new RuntimeException(e);
 +        }
 +
 +        CodeSource codeSource;
 +        try
 +        {
 +            codeSource = new CodeSource(new URL("udf", "localhost", 0, "/java", new URLStreamHandler()
 +            {
 +                protected URLConnection openConnection(URL u)
 +                {
 +                    return null;
 +                }
 +            }), (Certificate[])null);
 +        }
 +        catch (MalformedURLException e)
 +        {
 +            throw new RuntimeException(e);
 +        }
 +
 +        protectionDomain = new ProtectionDomain(codeSource, ThreadAwareSecurityManager.noPermissions,
targetClassLoader, null);
 +    }
 +
 +    private final JavaUDF javaUDF;
 +
 +    JavaBasedUDFunction(FunctionName name, List<ColumnIdentifier> argNames, List<AbstractType<?>>
argTypes,
 +                        AbstractType<?> returnType, boolean calledOnNullInput, String
body)
 +    {
 +        super(name, argNames, argTypes, UDHelper.driverTypes(argTypes),
 +              returnType, UDHelper.driverType(returnType), calledOnNullInput, "java", body);
 +
 +        // javaParamTypes is just the Java representation for argTypes resp. argDataTypes
 +        Class<?>[] javaParamTypes = UDHelper.javaTypes(argDataTypes, calledOnNullInput);
 +        // javaReturnType is just the Java representation for returnType resp. returnDataType
 +        Class<?> javaReturnType = UDHelper.asJavaClass(returnDataType);
 +
 +        // put each UDF in a separate package to prevent cross-UDF code access
 +        String pkgName = BASE_PACKAGE + '.' + generateClassName(name, 'p');
 +        String clsName = generateClassName(name, 'C');
 +
 +        String executeInternalName = generateClassName(name, 'x');
 +
 +        StringBuilder javaSourceBuilder = new StringBuilder();
 +        int lineOffset = 1;
 +        for (int i = 0; i < javaSourceTemplate.length; i++)
 +        {
 +            String s = javaSourceTemplate[i];
 +
 +            // strings at odd indexes are 'instructions'
 +            if ((i & 1) == 1)
 +            {
 +                switch (s)
 +                {
 +                    case "package_name":
 +                        s = pkgName;
 +                        break;
 +                    case "class_name":
 +                        s = clsName;
 +                        break;
 +                    case "body":
 +                        lineOffset = countNewlines(javaSourceBuilder);
 +                        s = body;
 +                        break;
 +                    case "arguments":
 +                        s = generateArguments(javaParamTypes, argNames);
 +                        break;
 +                    case "argument_list":
 +                        s = generateArgumentList(javaParamTypes, argNames);
 +                        break;
 +                    case "return_type":
 +                        s = javaSourceName(javaReturnType);
 +                        break;
 +                    case "execute_internal_name":
 +                        s = executeInternalName;
 +                        break;
 +                }
 +            }
 +
 +            javaSourceBuilder.append(s);
 +        }
 +
 +        String targetClassName = pkgName + '.' + clsName;
 +
 +        String javaSource = javaSourceBuilder.toString();
 +
 +        logger.trace("Compiling Java source UDF '{}' as class '{}' using source:\n{}", name,
targetClassName, javaSource);
 +
 +        try
 +        {
 +            EcjCompilationUnit compilationUnit = new EcjCompilationUnit(javaSource, targetClassName);
 +
 +            org.eclipse.jdt.internal.compiler.Compiler compiler = new Compiler(compilationUnit,
 +                                                                               errorHandlingPolicy,
 +                                                                               compilerOptions,
 +                                                                               compilationUnit,
 +                                                                               problemFactory);
 +            compiler.compile(new ICompilationUnit[]{ compilationUnit });
 +
 +            if (compilationUnit.problemList != null && !compilationUnit.problemList.isEmpty())
 +            {
 +                boolean fullSource = false;
 +                StringBuilder problems = new StringBuilder();
 +                for (IProblem problem : compilationUnit.problemList)
 +                {
 +                    long ln = problem.getSourceLineNumber() - lineOffset;
 +                    if (ln < 1L)
 +                    {
 +                        if (problem.isError())
 +                        {
 +                            // if generated source around UDF source provided by the user
is buggy,
 +                            // this code is appended.
 +                            problems.append("GENERATED SOURCE ERROR: line ")
 +                                    .append(problem.getSourceLineNumber())
 +                                    .append(" (in generated source): ")
 +                                    .append(problem.getMessage())
 +                                    .append('\n');
 +                            fullSource = true;
 +                        }
 +                    }
 +                    else
 +                    {
 +                        problems.append("Line ")
 +                                .append(Long.toString(ln))
 +                                .append(": ")
 +                                .append(problem.getMessage())
 +                                .append('\n');
 +                    }
 +                }
 +
 +                if (fullSource)
 +                    throw new InvalidRequestException("Java source compilation failed:\n"
+ problems + "\n generated source:\n" + javaSource);
 +                else
 +                    throw new InvalidRequestException("Java source compilation failed:\n"
+ problems);
 +            }
 +
 +            // Verify the UDF bytecode against use of probably dangerous code
 +            Set<String> errors = udfByteCodeVerifier.verify(targetClassLoader.classData(targetClassName));
 +            String validDeclare = "not allowed method declared: " + executeInternalName
+ '(';
 +            String validCall = "call to " + targetClassName.replace('.', '/') + '.' + executeInternalName
+ "()";
 +            for (Iterator<String> i = errors.iterator(); i.hasNext();)
 +            {
 +                String error = i.next();
 +                // we generate a random name of the private, internal execute method, which
is detected by the byte-code verifier
 +                if (error.startsWith(validDeclare) || error.equals(validCall))
 +                {
 +                    i.remove();
 +                }
 +            }
 +            if (!errors.isEmpty())
 +                throw new InvalidRequestException("Java UDF validation failed: " + errors);
 +
 +            // Load the class and create a new instance of it
 +            Thread thread = Thread.currentThread();
 +            ClassLoader orig = thread.getContextClassLoader();
 +            try
 +            {
 +                thread.setContextClassLoader(UDFunction.udfClassLoader);
 +                // Execute UDF intiialization from UDF class loader
 +
 +                Class cls = Class.forName(targetClassName, false, targetClassLoader);
 +
-                 if (cls.getDeclaredMethods().length != 2 || cls.getDeclaredConstructors().length
!= 1)
++                // Count only non-synthetic methods, so code coverage instrumentation doesn't
cause a miscount
++                int nonSyntheticMethodCount = 0;
++                for (Method m : cls.getDeclaredMethods())
++                {
++                    if (!m.isSynthetic())
++                    {
++                        nonSyntheticMethodCount += 1;
++                    }
++                }
++
++                if (nonSyntheticMethodCount != 2 || cls.getDeclaredConstructors().length
!= 1)
 +                    throw new InvalidRequestException("Check your source to not define additional
Java methods or constructors");
 +                MethodType methodType = MethodType.methodType(void.class)
 +                                                  .appendParameterTypes(DataType.class,
DataType[].class);
 +                MethodHandle ctor = MethodHandles.lookup().findConstructor(cls, methodType);
 +                this.javaUDF = (JavaUDF) ctor.invokeWithArguments(returnDataType, argDataTypes);
 +            }
 +            finally
 +            {
 +                thread.setContextClassLoader(orig);
 +            }
 +        }
 +        catch (InvocationTargetException e)
 +        {
 +            // in case of an ITE, use the cause
 +            throw new InvalidRequestException(String.format("Could not compile function
'%s' from Java source: %s", name, e.getCause()));
 +        }
 +        catch (VirtualMachineError e)
 +        {
 +            throw e;
 +        }
 +        catch (Throwable e)
 +        {
 +            throw new InvalidRequestException(String.format("Could not compile function
'%s' from Java source: %s", name, e));
 +        }
 +    }
 +
 +    protected ExecutorService executor()
 +    {
 +        return executor;
 +    }
 +
 +    protected ByteBuffer executeUserDefined(int protocolVersion, List<ByteBuffer>
params)
 +    {
 +        return javaUDF.executeImpl(protocolVersion, params);
 +    }
 +
 +
 +    private static int countNewlines(StringBuilder javaSource)
 +    {
 +        int ln = 0;
 +        for (int i = 0; i < javaSource.length(); i++)
 +            if (javaSource.charAt(i) == '\n')
 +                ln++;
 +        return ln;
 +    }
 +
 +    private static String generateClassName(FunctionName name, char prefix)
 +    {
 +        String qualifiedName = name.toString();
 +
 +        StringBuilder sb = new StringBuilder(qualifiedName.length() + 10);
 +        sb.append(prefix);
 +        for (int i = 0; i < qualifiedName.length(); i++)
 +        {
 +            char c = qualifiedName.charAt(i);
 +            if (Character.isJavaIdentifierPart(c))
 +                sb.append(c);
 +            else
 +                sb.append(Integer.toHexString(((short)c)&0xffff));
 +        }
 +        sb.append('_')
 +          .append(ThreadLocalRandom.current().nextInt() & 0xffffff)
 +          .append('_')
 +          .append(classSequence.incrementAndGet());
 +        return sb.toString();
 +    }
 +
 +    private static String javaSourceName(Class<?> type)
 +    {
 +        String n = type.getName();
 +        return n.startsWith("java.lang.") ? type.getSimpleName() : n;
 +    }
 +
 +    private static String generateArgumentList(Class<?>[] paramTypes, List<ColumnIdentifier>
argNames)
 +    {
 +        // initial builder size can just be a guess (prevent temp object allocations)
 +        StringBuilder code = new StringBuilder(32 * paramTypes.length);
 +        for (int i = 0; i < paramTypes.length; i++)
 +        {
 +            if (i > 0)
 +                code.append(", ");
 +            code.append(javaSourceName(paramTypes[i]))
 +                .append(' ')
 +                .append(argNames.get(i));
 +        }
 +        return code.toString();
 +    }
 +
 +    private static String generateArguments(Class<?>[] paramTypes, List<ColumnIdentifier>
argNames)
 +    {
 +        StringBuilder code = new StringBuilder(64 * paramTypes.length);
 +        for (int i = 0; i < paramTypes.length; i++)
 +        {
 +            if (i > 0)
 +                code.append(",\n");
 +
 +            if (logger.isTraceEnabled())
 +                code.append("            /* parameter '").append(argNames.get(i)).append("'
*/\n");
 +
 +            code
 +                // cast to Java type
 +                .append("            (").append(javaSourceName(paramTypes[i])).append(")
")
 +                // generate object representation of input parameter (call UDFunction.compose)
 +                .append(composeMethod(paramTypes[i])).append("(protocolVersion, ").append(i).append(",
params.get(").append(i).append("))");
 +        }
 +        return code.toString();
 +    }
 +
 +    private static String composeMethod(Class<?> type)
 +    {
 +        return (type.isPrimitive()) ? ("super.compose_" + type.getName()) : "super.compose";
 +    }
 +
 +    // Java source UDFs are a very simple compilation task, which allows us to let one class
implement
 +    // all interfaces required by ECJ.
 +    static final class EcjCompilationUnit implements ICompilationUnit, ICompilerRequestor,
INameEnvironment
 +    {
 +        List<IProblem> problemList;
 +        private final String className;
 +        private final char[] sourceCode;
 +
 +        EcjCompilationUnit(String sourceCode, String className)
 +        {
 +            this.className = className;
 +            this.sourceCode = sourceCode.toCharArray();
 +        }
 +
 +        // ICompilationUnit
 +
 +        @Override
 +        public char[] getFileName()
 +        {
 +            return sourceCode;
 +        }
 +
 +        @Override
 +        public char[] getContents()
 +        {
 +            return sourceCode;
 +        }
 +
 +        @Override
 +        public char[] getMainTypeName()
 +        {
 +            int dot = className.lastIndexOf('.');
 +            return ((dot > 0) ? className.substring(dot + 1) : className).toCharArray();
 +        }
 +
 +        @Override
 +        public char[][] getPackageName()
 +        {
 +            StringTokenizer izer = new StringTokenizer(className, ".");
 +            char[][] result = new char[izer.countTokens() - 1][];
 +            for (int i = 0; i < result.length; i++)
 +                result[i] = izer.nextToken().toCharArray();
 +            return result;
 +        }
 +
 +        @Override
 +        public boolean ignoreOptionalProblems()
 +        {
 +            return false;
 +        }
 +
 +        // ICompilerRequestor
 +
 +        @Override
 +        public void acceptResult(CompilationResult result)
 +        {
 +            if (result.hasErrors())
 +            {
 +                IProblem[] problems = result.getProblems();
 +                if (problemList == null)
 +                    problemList = new ArrayList<>(problems.length);
 +                Collections.addAll(problemList, problems);
 +            }
 +            else
 +            {
 +                ClassFile[] classFiles = result.getClassFiles();
 +                for (ClassFile classFile : classFiles)
 +                    targetClassLoader.addClass(className, classFile.getBytes());
 +            }
 +        }
 +
 +        // INameEnvironment
 +
 +        @Override
 +        public NameEnvironmentAnswer findType(char[][] compoundTypeName)
 +        {
 +            StringBuilder result = new StringBuilder();
 +            for (int i = 0; i < compoundTypeName.length; i++)
 +            {
 +                if (i > 0)
 +                    result.append('.');
 +                result.append(compoundTypeName[i]);
 +            }
 +            return findType(result.toString());
 +        }
 +
 +        @Override
 +        public NameEnvironmentAnswer findType(char[] typeName, char[][] packageName)
 +        {
 +            StringBuilder result = new StringBuilder();
 +            int i = 0;
 +            for (; i < packageName.length; i++)
 +            {
 +                if (i > 0)
 +                    result.append('.');
 +                result.append(packageName[i]);
 +            }
 +            if (i > 0)
 +                result.append('.');
 +            result.append(typeName);
 +            return findType(result.toString());
 +        }
 +
 +        private NameEnvironmentAnswer findType(String className)
 +        {
 +            if (className.equals(this.className))
 +            {
 +                return new NameEnvironmentAnswer(this, null);
 +            }
 +
 +            String resourceName = className.replace('.', '/') + ".class";
 +
 +            try (InputStream is = UDFunction.udfClassLoader.getResourceAsStream(resourceName))
 +            {
 +                if (is != null)
 +                {
 +                    byte[] classBytes = ByteStreams.toByteArray(is);
 +                    char[] fileName = className.toCharArray();
 +                    ClassFileReader classFileReader = new ClassFileReader(classBytes, fileName,
true);
 +                    return new NameEnvironmentAnswer(classFileReader, null);
 +                }
 +            }
 +            catch (IOException | ClassFormatException exc)
 +            {
 +                throw new RuntimeException(exc);
 +            }
 +            return null;
 +        }
 +
 +        private boolean isPackage(String result)
 +        {
 +            if (result.equals(this.className))
 +                return false;
 +            String resourceName = result.replace('.', '/') + ".class";
 +            try (InputStream is = UDFunction.udfClassLoader.getResourceAsStream(resourceName))
 +            {
 +                return is == null;
 +            }
 +            catch (IOException e)
 +            {
 +                // we are here, since close on is failed. That means it was not null
 +                return false;
 +            }
 +        }
 +
 +        @Override
 +        public boolean isPackage(char[][] parentPackageName, char[] packageName)
 +        {
 +            StringBuilder result = new StringBuilder();
 +            int i = 0;
 +            if (parentPackageName != null)
 +                for (; i < parentPackageName.length; i++)
 +                {
 +                    if (i > 0)
 +                        result.append('.');
 +                    result.append(parentPackageName[i]);
 +                }
 +
 +            if (Character.isUpperCase(packageName[0]) && !isPackage(result.toString()))
 +                return false;
 +            if (i > 0)
 +                result.append('.');
 +            result.append(packageName);
 +
 +            return isPackage(result.toString());
 +        }
 +
 +        @Override
 +        public void cleanup()
 +        {
 +        }
 +    }
 +
 +    static final class EcjTargetClassLoader extends SecureClassLoader
 +    {
 +        EcjTargetClassLoader()
 +        {
 +            super(UDFunction.udfClassLoader);
 +        }
 +
 +        // This map is usually empty.
 +        // It only contains data *during* UDF compilation but not during runtime.
 +        //
 +        // addClass() is invoked by ECJ after successful compilation of the generated Java
source.
 +        // loadClass(targetClassName) is invoked by buildUDF() after ECJ returned from successful
compilation.
 +        //
 +        private final Map<String, byte[]> classes = new ConcurrentHashMap<>();
 +
 +        void addClass(String className, byte[] classData)
 +        {
 +            classes.put(className, classData);
 +        }
 +
 +        byte[] classData(String className)
 +        {
 +            return classes.get(className);
 +        }
 +
 +        protected Class<?> findClass(String name) throws ClassNotFoundException
 +        {
 +            // remove the class binary - it's only used once - so it's wasting heap
 +            byte[] classData = classes.remove(name);
 +
 +            if (classData != null)
 +                return defineClass(name, classData, 0, classData.length, protectionDomain);
 +
 +            return getParent().loadClass(name);
 +        }
 +
 +        protected PermissionCollection getPermissions(CodeSource codesource)
 +        {
 +            return ThreadAwareSecurityManager.noPermissions;
 +        }
 +    }}


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