Package org.apache.sling.discovery.commons.providers.spi.base

Class ClusterSyncServiceChain

  • All Implemented Interfaces:
    ClusterSyncService
    public class ClusterSyncServiceChain
extends java.lang.Object
implements ClusterSyncService
    Allows chaining of ClusterSyncService, itself implementing the ClusterSyncService interface

    • Constructor Summary

      Constructors 
      Constructor Description
      ClusterSyncServiceChain​(ClusterSyncService... chain)
      Creates a new chain of ClusterSyncService that calls a cascaded sync with the provided ClusterSyncService.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void cancelSync()  
      void sync​(BaseTopologyView view, java.lang.Runnable callback)
      Starts the synchronization process and calls the provided callback upon completion.

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • ClusterSyncServiceChain

        public ClusterSyncServiceChain​(ClusterSyncService... chain)
        Creates a new chain of ClusterSyncService that calls a cascaded sync with the provided ClusterSyncService.

    • Method Detail

      • sync

        public void sync​(BaseTopologyView view,
                 java.lang.Runnable callback)
        Description copied from interface: ClusterSyncService
        Starts the synchronization process and calls the provided callback upon completion.

        sync() is not thread-safe and should not be invoked concurrently.

        If sync() gets called before a previous invocation finished, that previous invocation will be discarded, ie the callback of the previous invocation will no longer be called.

        The synchronization process consists of making sure that the repository has processed any potential backlog of instances that are no longer part of the provided, new view. Plus it writes a 'sync-token' to a well-defined location, with all peers doing the same, and upon seeing all other sync-tokens declares successful completion - at which point it calls the callback.run().

        Specified by:
        sync in interface ClusterSyncService
        Parameters:
        view - the view which all instances in the local cluster should agree on having seen
        callback - the runnable which should be called after successful syncing