Type Members

1.  class CASLong extends AnyRef

   Implements atomic distributed Long using optimistic locking mechanism.

   Implements atomic distributed Long using optimistic locking mechanism. The principle of changing the persisted counter/long value is to: 1) read the value from Consul including the latest ModificationIndex. 2) store the updated value to Consul using compare-and-set with the read ModificationIndex. Should the write fail due to concurrency issues, we loop back to step 1 and try again. Generally all operations will fail if there is no such key/path or the key doesn't have a numerical value.

2.  trait Candidate extends AnyRef

   Represents a candidate in the leader election

3.  class Consul extends AnyRef

   Encapsulates functions towards Consul.

4.  trait ElectionObserver extends AnyRef

   Observer to be notified for changes in election state.

5.  class Semaphore extends AnyRef

   A semaphore is a construction to control access to a common resource in a concurrent system.

   A semaphore is a construction to control access to a common resource in a concurrent system. The semaphore in this library allows for creation of a distributed lock. In principle a semaphore is initiated with 1..n permits, instances of a semaphore then try to acquire one permit either succeeding or failing in case there are no more permits left to take. The simplest form is a binary semaphore which has only one permit thus only allowing a single instance to acquire a permit. Semaphores are traditionally used to control access to a protected source like a database or some task that only should be executed by a single process.

   Each instance of the Semaphore class can hold exactly 0 or 1 permit thus invoking any of the tryAcquire functions mulitple times will not acquire additional permits.

6.  type SessionID = String