Examples of com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableHolder

com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableHolder

Factory that encompasses functionality of {@link HystrixRequestVariable} for internal Hystrix code.

This is used as a layer between the actual {@link HystrixRequestVariable} and calling code to allow injected implementations of {@link HystrixConcurrencyStrategy}.

Typically a {@link HystrixRequestVariable} would be statically references (similar to a ThreadLocal) but to allow dynamic injection we instead statically reference this class which can thendynamically fetch the correct implementation and statically retain an instance across threads within a context (such as {@link HystrixRequestContext}. @param < T> @ExcludeFromJavadoc

    @SuppressWarnings("unchecked")
    private HystrixRequestVariableHolder<RequestCollapser<?, ?, ?>> getRequestVariableForCommand(final HystrixCollapserBridge<BatchReturnType, ResponseType, RequestArgumentType> commandCollapser) {
        HystrixRequestVariableHolder<RequestCollapser<?, ?, ?>> requestVariable = requestScopedCollapsers.get(commandCollapser.getCollapserKey().name());
        if (requestVariable == null) {
            // create new collapser using 'this' first instance as the one that will get cached for future executions ('this' is stateless so we can do that)
            @SuppressWarnings({ "rawtypes" })
            HystrixRequestVariableHolder newCollapser = new RequestCollapserRequestVariable(commandCollapser, properties, timer, concurrencyStrategy);
            HystrixRequestVariableHolder<RequestCollapser<?, ?, ?>> existing = requestScopedCollapsers.putIfAbsent(commandCollapser.getCollapserKey().name(), newCollapser);
            if (existing == null) {
                // this thread won, so return the one we just created
                requestVariable = newCollapser;

Examples of com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableHolder

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