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Java idiomatic client for Google Cloud Spanner.
/*
* Copyright 2019 Google LLC
*
* 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 com.google.cloud.spanner.connection;
import com.google.api.core.ApiFuture;
import com.google.api.core.InternalApi;
import com.google.cloud.Timestamp;
import com.google.cloud.spanner.CommitResponse;
import com.google.cloud.spanner.Dialect;
import com.google.cloud.spanner.Mutation;
import com.google.cloud.spanner.Options.QueryOption;
import com.google.cloud.spanner.Options.UpdateOption;
import com.google.cloud.spanner.PartitionOptions;
import com.google.cloud.spanner.ReadContext;
import com.google.cloud.spanner.ResultSet;
import com.google.cloud.spanner.SpannerException;
import com.google.cloud.spanner.TransactionContext;
import com.google.cloud.spanner.connection.AbstractStatementParser.ParsedStatement;
import com.google.spanner.v1.ResultSetStats;
import java.util.concurrent.ExecutionException;
import javax.annotation.Nonnull;
/** Internal interface for transactions and batches on {@link Connection}s. */
@InternalApi
interface UnitOfWork {
enum CallType {
SYNC,
ASYNC
}
/** A unit of work can be either a transaction or a DDL/DML batch. */
enum Type {
TRANSACTION,
BATCH
}
enum UnitOfWorkState {
STARTED,
COMMITTING,
COMMITTED,
COMMIT_FAILED,
ROLLED_BACK,
RUNNING,
RAN,
RUN_FAILED,
ABORTED;
public boolean isActive() {
return this == STARTED;
}
}
/** Cancel the currently running statement (if any and the statement may be cancelled). */
void cancel();
/** @return the type of unit of work. */
Type getType();
/** @return the current state of this unit of work. */
UnitOfWorkState getState();
/** @return true if this unit of work is still active. */
boolean isActive();
/**
* Commits the changes in this unit of work to the database. For read-only transactions, this only
* closes the {@link ReadContext}. This method will throw a {@link SpannerException} if called for
* a {@link Type#BATCH}.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @return An {@link ApiFuture} that is done when the commit has finished.
*/
ApiFuture commitAsync(CallType callType);
/**
* Rollbacks any changes in this unit of work. For read-only transactions, this only closes the
* {@link ReadContext}. This method will throw a {@link SpannerException} if called for a {@link
* Type#BATCH}.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @return An {@link ApiFuture} that is done when the rollback has finished.
*/
ApiFuture rollbackAsync(CallType callType);
/** @see Connection#savepoint(String) */
void savepoint(@Nonnull String name, @Nonnull Dialect dialect);
/** @see Connection#releaseSavepoint(String) */
void releaseSavepoint(@Nonnull String name);
/** @see Connection#rollbackToSavepoint(String) */
void rollbackToSavepoint(@Nonnull String name, @Nonnull SavepointSupport savepointSupport);
/**
* Sends the currently buffered statements in this unit of work to the database and ends the
* batch. This method will throw a {@link SpannerException} if called for a {@link
* Type#TRANSACTION}.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @return an {@link ApiFuture} containing the update counts in case of a DML batch. Returns an
* array containing 1 for each successful statement and 0 for each failed statement or
* statement that was not executed in case of a DDL batch.
*/
ApiFuture runBatchAsync(CallType callType);
/**
* Clears the currently buffered statements in this unit of work and ends the batch. This method
* will throw a {@link SpannerException} if called for a {@link Type#TRANSACTION}. This method is
* always non-blocking.
*/
void abortBatch();
/** @return true if this unit of work is read-only. */
boolean isReadOnly();
/**
* @return true if this unit of work supports {@link
* com.google.spanner.v1.DirectedReadOptions}
*/
default boolean supportsDirectedReads(ParsedStatement parsedStatement) {
return false;
}
/**
* Executes a query with the given options. If {@link AnalyzeMode} is set to {@link
* AnalyzeMode#PLAN} or {@link AnalyzeMode#PROFILE}, the returned {@link ResultSet} will include
* {@link ResultSetStats}.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @param statement The statement to execute.
* @param analyzeMode Indicates whether to include {@link ResultSetStats} in the returned {@link
* ResultSet} or not. Cannot be used in combination with {@link QueryOption}s.
* @param options the options to configure the query. May only be set if analyzeMode is set to
* {@link AnalyzeMode#NONE}.
* @return an {@link ApiFuture} containing a {@link ResultSet} with the results of the query.
* @throws SpannerException if the query is not allowed on this {@link UnitOfWork}. The {@link
* ApiFuture} will return a {@link SpannerException} wrapped in an {@link ExecutionException}
* if a database error occurs.
*/
ApiFuture executeQueryAsync(
CallType callType,
ParsedStatement statement,
AnalyzeMode analyzeMode,
QueryOption... options);
ApiFuture partitionQueryAsync(
CallType callType,
ParsedStatement query,
PartitionOptions partitionOptions,
QueryOption... options);
/**
* @return the read timestamp of this transaction. Will throw a {@link SpannerException} if there
* is no read timestamp.
*/
Timestamp getReadTimestamp();
/** @return the read timestamp of this transaction or null if there is no read timestamp. */
Timestamp getReadTimestampOrNull();
/**
* @return the commit timestamp of this transaction. Will throw a {@link SpannerException} if
* there is no commit timestamp.
*/
Timestamp getCommitTimestamp();
/** @return the commit timestamp of this transaction or null if there is no commit timestamp. */
Timestamp getCommitTimestampOrNull();
/**
* @return the {@link CommitResponse} of this transaction
* @throws SpannerException if there is no {@link CommitResponse}
*/
CommitResponse getCommitResponse();
/**
* @return the {@link CommitResponse} of this transaction or null if there is no {@link
* CommitResponse}
*/
CommitResponse getCommitResponseOrNull();
/**
* Executes the specified DDL statements in this unit of work. For DDL batches, this will mean
* that the statements are buffered locally and will be sent to Spanner when {@link
* UnitOfWork#commit()} is called. For {@link SingleUseTransaction}s, this will execute the DDL
* statement directly on Spanner.
*
* @param ddl The DDL statement to execute.
* @return an {@link ApiFuture} that is done when the DDL operation has finished.
*/
ApiFuture executeDdlAsync(CallType callType, ParsedStatement ddl);
/**
* Execute a DML statement on Spanner.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @param update The DML statement to execute.
* @param options Update options to apply for the statement.
* @return an {@link ApiFuture} containing the number of records that were
* inserted/updated/deleted by this statement.
*/
ApiFuture executeUpdateAsync(
CallType callType, ParsedStatement update, UpdateOption... options);
/**
* Execute and/or analyze a DML statement on Spanner.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @param update The DML statement to analyze/execute.
* @param analyzeMode Specifies the query/analyze mode to use for the DML statement.
* @param options Update options to apply for the statement.
* @return an {@link ApiFuture} containing the {@link ResultSet} that were returned by this
* statement. The {@link ResultSet} will not contain any rows.
*/
ApiFuture analyzeUpdateAsync(
CallType callType, ParsedStatement update, AnalyzeMode analyzeMode, UpdateOption... options);
/**
* Execute a batch of DML statements on Spanner.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @param updates The DML statements to execute.
* @param options Update options to apply for the statement.
* @return an {@link ApiFuture} containing an array with the number of records that were
* inserted/updated/deleted per statement.
* @see TransactionContext#batchUpdate(Iterable)
*/
ApiFuture executeBatchUpdateAsync(
CallType callType, Iterable updates, UpdateOption... options);
/**
* Writes a batch of {@link Mutation}s to Spanner. For {@link ReadWriteTransaction}s, this means
* buffering the {@link Mutation}s locally and writing the {@link Mutation}s to Spanner upon
* {@link UnitOfWork#commit()}. For {@link SingleUseTransaction}s, the {@link Mutation}s will be
* sent directly to Spanner.
*
* @param callType Indicates whether the top-level call is a sync or async call.
* @param mutations The mutations to write.
* @return an {@link ApiFuture} that is done when the {@link Mutation}s have been successfully
* buffered or written to Cloud Spanner.
*/
ApiFuture writeAsync(CallType callType, Iterable mutations);
}