Package org.jctools.queues.atomic

Class JavaParsingAtomicLinkedQueueGenerator

  • All Implemented Interfaces:
    com.github.javaparser.ast.visitor.VoidVisitor<java.lang.Void>, JCToolsGenerator
    Direct Known Subclasses:
    JavaParsingAtomicUnpaddedLinkedQueueGenerator
    public class JavaParsingAtomicLinkedQueueGenerator
extends JavaParsingAtomicQueueGenerator
    This generator takes in an JCTools 'LinkedQueue' Java source file and patches Unsafe accesses into atomic AtomicLongFieldUpdater. It outputs a Java source file with these patches.

    An 'LinkedQueue' is one that is backed by a linked list and use a producerNode and a consumerNode field to track the positions of each.

    • Field Detail

      • mpscLinkedQueueName

        private final java.lang.String mpscLinkedQueueName

    • Constructor Detail

      • JavaParsingAtomicLinkedQueueGenerator

        public JavaParsingAtomicLinkedQueueGenerator​(java.lang.String sourceFileName)

    • Method Detail

      • main

        public static void main​(java.lang.String[] args)
                 throws java.lang.Exception
        Throws:
        java.lang.Exception

      • visit

        public void visit​(com.github.javaparser.ast.body.ConstructorDeclaration n,
                  java.lang.Void arg)
        Specified by:
        visit in interface com.github.javaparser.ast.visitor.VoidVisitor<java.lang.Void>
        Overrides:
        visit in class com.github.javaparser.ast.visitor.VoidVisitorAdapter<java.lang.Void>

      • atomicQueueName

        private java.lang.String atomicQueueName()

      • visit

        public void visit​(com.github.javaparser.ast.body.ClassOrInterfaceDeclaration node,
                  java.lang.Void arg)
        Specified by:
        visit in interface com.github.javaparser.ast.visitor.VoidVisitor<java.lang.Void>
        Overrides:
        visit in class com.github.javaparser.ast.visitor.VoidVisitorAdapter<java.lang.Void>

      • visit

        public void visit​(com.github.javaparser.ast.expr.CastExpr n,
                  java.lang.Void arg)
        Specified by:
        visit in interface com.github.javaparser.ast.visitor.VoidVisitor<java.lang.Void>
        Overrides:
        visit in class com.github.javaparser.ast.visitor.VoidVisitorAdapter<java.lang.Void>

      • visit

        public void visit​(com.github.javaparser.ast.body.MethodDeclaration n,
                  java.lang.Void arg)
        Specified by:
        visit in interface com.github.javaparser.ast.visitor.VoidVisitor<java.lang.Void>
        Overrides:
        visit in class com.github.javaparser.ast.visitor.VoidVisitorAdapter<java.lang.Void>

      • visit

        public void visit​(com.github.javaparser.ast.expr.ObjectCreationExpr n,
                  java.lang.Void arg)
        Specified by:
        visit in interface com.github.javaparser.ast.visitor.VoidVisitor<java.lang.Void>
        Overrides:
        visit in class com.github.javaparser.ast.visitor.VoidVisitorAdapter<java.lang.Void>

      • processSpecialNodeTypes

        void processSpecialNodeTypes​(com.github.javaparser.ast.nodeTypes.NodeWithType<?,​com.github.javaparser.ast.type.Type> node,
                             java.lang.String name)
        Given a variable declaration of some sort, check it's name and type and if it looks like any of the key type changes between unsafe and atomic queues, perform the conversion to change it's type.
        Specified by:
        processSpecialNodeTypes in class JavaParsingAtomicQueueGenerator

      • patchAtomicFieldUpdaterAccessorMethods

        private void patchAtomicFieldUpdaterAccessorMethods​(com.github.javaparser.ast.body.ClassOrInterfaceDeclaration n)
        For each method accessor to a field, add in the calls necessary to AtomicFieldUpdaters. Only methods start with so/cas/sv/lv/lp/sp/xchg followed by the field name are processed. Clearly lv, lp and sv are simple field accesses with only so and cas using the AtomicFieldUpdaters.
        Parameters:
        n - the AST node for the containing class

      • fieldUpdaterGetAndSet

        private com.github.javaparser.ast.stmt.BlockStmt fieldUpdaterGetAndSet​(java.lang.String fieldUpdaterFieldName,
                                                                       java.lang.String newValueName)
        Generates something like return P_INDEX_UPDATER.getAndSet(this, newValue)

      • declareRefFieldUpdater

        private com.github.javaparser.ast.body.FieldDeclaration declareRefFieldUpdater​(java.lang.String className,
                                                                               java.lang.String variableName)
        Generates something like private static final AtomicReferenceFieldUpdater P_NODE_UPDATER = AtomicReferenceFieldUpdater.newUpdater(MpmcAtomicArrayQueueProducerNodeField.class, "producerNode");

      • newAtomicRefFieldUpdater

        private com.github.javaparser.ast.expr.MethodCallExpr newAtomicRefFieldUpdater​(java.lang.String className,
                                                                               java.lang.String variableName)

      • atomicRefArrayType

        private com.github.javaparser.ast.type.ClassOrInterfaceType atomicRefArrayType​(com.github.javaparser.ast.type.ArrayType in)