How to use

HystrixRequestVariable

in

com.netflix.hystrix.strategy.concurrency

@SuppressWarnings("unchecked")
public T get(HystrixConcurrencyStrategy concurrencyStrategy) {
  /*
   * 1) Fetch RequestVariable implementation from cache.
   * 2) If no implementation is found in cache then construct from factory.
   * 3) Cache implementation from factory as each object instance needs to be statically cached to be relevant across threads.
   */
  RVCacheKey key = new RVCacheKey(this, concurrencyStrategy);
  HystrixRequestVariable<?> rvInstance = requestVariableInstance.get(key);
  if (rvInstance == null) {
    requestVariableInstance.putIfAbsent(key, concurrencyStrategy.getRequestVariable(lifeCycleMethods));
    /*
     * A safety check to help debug problems if someone starts injecting dynamically created HystrixConcurrencyStrategy instances - which should not be done and has no good reason to be done.
     * 
     * The 100 value is arbitrary ... just a number far higher than we should see.
     */
    if (requestVariableInstance.size() > 100) {
      logger.warn("Over 100 instances of HystrixRequestVariable are being stored. This is likely the sign of a memory leak caused by using unique instances of HystrixConcurrencyStrategy instead of a single instance.");
    }
  }
  return (T) requestVariableInstance.get(key).get();
}

@SuppressWarnings("unchecked")
public T get(HystrixConcurrencyStrategy concurrencyStrategy) {
  /*
   * 1) Fetch RequestVariable implementation from cache.
   * 2) If no implementation is found in cache then construct from factory.
   * 3) Cache implementation from factory as each object instance needs to be statically cached to be relevant across threads.
   */
  RVCacheKey key = new RVCacheKey(this, concurrencyStrategy);
  HystrixRequestVariable<?> rvInstance = requestVariableInstance.get(key);
  if (rvInstance == null) {
    requestVariableInstance.putIfAbsent(key, concurrencyStrategy.getRequestVariable(lifeCycleMethods));
    /*
     * A safety check to help debug problems if someone starts injecting dynamically created HystrixConcurrencyStrategy instances - which should not be done and has no good reason to be done.
     * 
     * The 100 value is arbitrary ... just a number far higher than we should see.
     */
    if (requestVariableInstance.size() > 100) {
      logger.warn("Over 100 instances of HystrixRequestVariable are being stored. This is likely the sign of a memory leak caused by using unique instances of HystrixConcurrencyStrategy instead of a single instance.");
    }
  }
  return (T) requestVariableInstance.get(key).get();
}