package com.netflix.astyanax.recipes.uniqueness; import com.netflix.astyanax.MutationBatch; public interface UniquenessConstraint { /** * Acquire the row(s) for uniqueness. Call release() when the uniqueness on * the row(s) is no longer needed, such as when deleting the rows. * * @throws NotUniqueException * @throws Exception */ void acquire() throws NotUniqueException, Exception; /** * Release the uniqueness lock for this row. Only call this when you no longer * need the uniqueness lock * * @throws Exception */ void release() throws Exception; /** * Acquire the uniqueness constraint and apply the final mutation if the * row if found to be unique * @param mutation * @throws NotUniqueException * @throws Exception */ void acquireAndMutate(MutationBatch mutation) throws NotUniqueException, Exception; }