Module jdk.dynalink

Class CompositeTypeBasedGuardingDynamicLinker

    • Constructor Detail

      • CompositeTypeBasedGuardingDynamicLinker

        public CompositeTypeBasedGuardingDynamicLinker​(Iterable<? extends TypeBasedGuardingDynamicLinker> linkers)
        Creates a new composite type-based linker.
        Parameters:
        linkers - the component linkers
        Throws:
        NullPointerException - if linkers or any of its elements are null.
    • Method Detail

      • getGuardedInvocation

        public GuardedInvocation getGuardedInvocation​(LinkRequest linkRequest,
                                                      LinkerServices linkerServices)
                                               throws Exception
        Description copied from interface: GuardingDynamicLinker
        Creates a guarded invocation appropriate for a particular invocation with the specified arguments at a call site.
        Specified by:
        getGuardedInvocation in interface GuardingDynamicLinker
        Parameters:
        linkRequest - the object describing the request for linking a particular invocation
        linkerServices - linker services
        Returns:
        a guarded invocation with a method handle suitable for the arguments, as well as a guard condition that if fails should trigger relinking. Must return null if it can't resolve the invocation. If the returned invocation is unconditional (which is actually quite rare), the guard in the return value can be null. The invocation can also have any number of switch points for asynchronous invalidation of the linkage, as well as a Throwable subclass that describes an expected exception condition that also triggers relinking (often it is faster to rely on an infrequent but expected ClassCastException than on an always evaluated instanceof guard). While the linker must produce an invocation with parameter types matching those in the call site descriptor of the link request, it should not try to match the return type expected at the call site except when it can do it with only the conversions that lose neither precision nor magnitude, see LinkerServices.asTypeLosslessReturn(MethodHandle, MethodType) for further explanation.
        Throws:
        Exception - if the operation fails for whatever reason