DATACASS-574 - Add reactive batch operations.

Original pull request: #134.

Author: OlegDokuka

spring-data-cassandra/src/main/java/org/springframework/data/cassandra/core/ReactiveCassandraBatchOperations.java

@@ -0,0 +1,183 @@
+/*
+ * Copyright 2016-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.cassandra.core;
+
+import reactor.core.publisher.Mono;
+
+import org.springframework.data.cassandra.core.cql.WriteOptions;
+
+/**
+ * Reactive Batch operations for insert/update/delete actions on a table. {@link ReactiveCassandraBatchOperations} use logged Cassandra
+ * {@code BATCH}es for single entities and collections of entities. A {@link ReactiveCassandraBatchOperations} instance cannot
+ * be modified/used once it was executed.
+ * <p>
+ * Batches are atomic by default. In the context of a Cassandra batch operation, atomic means that if any of the batch
+ * succeeds, all of it will. Statement order does not matter within a batch. {@link ReactiveCassandraBatchOperations} applies
+ * all rows using the same {@link #withTimestamp(long) timestamp} if supplied, otherwise Cassandra will generate a
+ * timestamp.
+ * <p>
+ * Multi partition batches should only be used to achieve atomicity for a few writes on different tables. Apart from
+ * this they should be avoided because they’re too expensive. Single partition batches can be used to get atomicity and
+ * isolation, they're not much more expensive than normal writes.
+ *
+ * @author Oleh Dokuka
+ * @since 2.0
+ */
+public interface ReactiveCassandraBatchOperations {
+
+/**
+ * Execute the batch. The batch can be executed only once.
+ *
+ * @return the {@link Mono<WriteResult>} for the bulk operation.
+ * @throws IllegalStateException if the batch is executed after it was executed already.
+ */
+Mono<WriteResult> execute();
+
+/**
+ * Apply a given {@code timestamp} to the whole batch.
+ *
+ * @param timestamp the timestamp to apply.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations withTimestamp(long timestamp);
+
+/**
+ * Add an array of inserts to the batch.
+ *
+ * @param entities the entities to insert; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations insert(Object... entities);
+
+/**
+ * Add a collection of inserts to the batch.
+ *
+ * @param entities the entities to insert; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations insert(Iterable<?> entities);
+
+/**
+ * Add a collection of inserts to the batch.
+ *
+ * @param entities the entities to insert; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations insert(Mono<? extends Iterable<?>> entities);
+
+/**
+ * Add a collection of inserts with given {@link WriteOptions} to the batch.
+ *
+ * @param entities the entities to insert; must not be {@literal null}.
+ * @param options the WriteOptions to apply; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ * @since 2.0
+ */
+ReactiveCassandraBatchOperations insert(Iterable<?> entities, WriteOptions options);
+
+
+/**
+ * Add a collection of inserts with given {@link WriteOptions} to the batch.
+ *
+ * @param entities the entities to insert; must not be {@literal null}.
+ * @param options the WriteOptions to apply; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ * @since 2.0
+ */
+ReactiveCassandraBatchOperations insert(Mono<? extends Iterable<?>> entities, WriteOptions options);
+
+/**
+ * Add an array of updates to the batch.
+ *
+ * @param entities the entities to update; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations update(Object... entities);
+
+/**
+ * Add a collection of updates to the batch.
+ *
+ * @param entities the entities to update; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations update(Iterable<?> entities);
+
+/**
+ * Add a collection of updates to the batch.
+ *
+ * @param entities the entities to update; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations update(Mono<? extends Iterable<?>> entities);
+
+/**
+ * Add a collection of updates with given {@link WriteOptions} to the batch.
+ *
+ * @param entities the entities to update; must not be {@literal null}.
+ * @param options the WriteOptions to apply; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ * @since 2.0
+ */
+ReactiveCassandraBatchOperations update(Iterable<?> entities, WriteOptions options);
+
+/**
+ * Add a collection of updates with given {@link WriteOptions} to the batch.
+ *
+ * @param entities the entities to update; must not be {@literal null}.
+ * @param options the WriteOptions to apply; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ * @since 2.0
+ */
+ReactiveCassandraBatchOperations update(Mono<? extends Iterable<?>> entities, WriteOptions options);
+
+/**
+ * Add an array of deletes to the batch.
+ *
+ * @param entities the entities to delete; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations delete(Object... entities);
+
+/**
+ * Add a collection of deletes to the batch.
+ *
+ * @param entities the entities to delete; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations delete(Iterable<?> entities);
+
+/**
+ * Add a collection of deletes to the batch.
+ *
+ * @param entities the entities to delete; must not be {@literal null}.
+ * @return {@code this} {@link ReactiveCassandraBatchOperations}.
+ * @throws IllegalStateException if the batch was already executed.
+ */
+ReactiveCassandraBatchOperations delete(Mono<? extends Iterable<?>> entities);
+}