package com.atlassian.sal.core.executor;
   
   import com.atlassian.sal.api.executor.ThreadLocalContextManager;
   
   import java.util.concurrent.Executor;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   
   /**
   * Executor that wraps executing runnables in a wrapper that transfers the threadlocal context
   */
  class ThreadLocalDelegateExecutor<C> implements Executor {
      private final Executor delegate;
      protected final ThreadLocalContextManager<C> manager;
  
      ThreadLocalDelegateExecutor(ThreadLocalContextManager<C> manager, Executor delegate) {
          this.delegate = checkNotNull(delegate);
          this.manager = checkNotNull(manager);
      }
  
      public void execute(Runnable runnable) {
          final Runnable wrapper = new ThreadLocalDelegateRunnable<C>(manager, runnable);
          delegate.execute(wrapper);
      }
  }