Module jdk.dynalink

Interface GuardingDynamicLinker

    • Method Detail

      • getGuardedInvocation

        GuardedInvocation getGuardedInvocation​(LinkRequest linkRequest,
                                               LinkerServices linkerServices)
                                        throws Exception
        Creates a guarded invocation appropriate for a particular invocation with the specified arguments at a call site.
        linkRequest - the object describing the request for linking a particular invocation
        linkerServices - linker services
        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.
        Exception - if the operation fails for whatever reason