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Listeners: What are conflict listeners and how to work with them?

To allow users to handle document replication conflicts automatically, we introduced a Document Conflict listener. To create your own listener of this type, just implement IDocumentConflictListener interface.

public interface IDocumentConflictListener {

  public boolean tryResolveConflict(String key, List<JsonDocument> results, Reference<JsonDocument> resolvedDocument);
}

Example

This example shows how to create an automatic conflict resolver by using IDocumentConflictListener, which will pick the newest item from the list of conflicted documents:

public class ResolveInFavourOfNewest implements IDocumentConflictListener {
  @Override
  public boolean tryResolveConflict(String key, List<JsonDocument> conflictedDocs, Reference<JsonDocument> resolvedDocument) {
    long maxDate = 0;
    for (JsonDocument doc : conflictedDocs) {
      if (doc.getLastModified().getTime() > maxDate) {
        maxDate = doc.getLastModified().getTime();
        resolvedDocument.value = doc;
      }
    }

    return resolvedDocument.value != null;
  }
}