/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.beam.sdk.io.gcp.bigtable;
import com.google.bigtable.v2.MutateRowResponse;
import com.google.bigtable.v2.Mutation;
import com.google.bigtable.v2.Row;
import com.google.bigtable.v2.SampleRowKeysResponse;
import com.google.cloud.bigtable.config.BigtableOptions;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.protobuf.ByteString;
import java.io.IOException;
import java.io.Serializable;
import java.util.List;
import java.util.NoSuchElementException;
import org.apache.beam.sdk.io.gcp.bigtable.BigtableIO.BigtableSource;
import org.apache.beam.sdk.values.KV;
/**
* An interface for real or fake implementations of Cloud Bigtable.
*/
interface BigtableService extends Serializable {
/**
* The interface of a class that can write to Cloud Bigtable.
*/
interface Writer {
/**
* Writes a single row transaction to Cloud Bigtable. The key of the {@code record} is the
* row key to be mutated and the iterable of mutations represent the changes to be made to the
* row.
*
* @throws IOException if there is an error submitting the write.
*/
ListenableFuture<MutateRowResponse> writeRecord(KV<ByteString, Iterable<Mutation>> record)
throws IOException;
/**
* Flushes the writer.
*
* @throws IOException if any writes did not succeed
*/
void flush() throws IOException;
/**
* Closes the writer.
*
* @throws IOException if there is an error closing the writer
*/
void close() throws IOException;
}
/**
* The interface of a class that reads from Cloud Bigtable.
*/
interface Reader {
/**
* Reads the first element (including initialization, such as opening a network connection) and
* returns true if an element was found.
*/
boolean start() throws IOException;
/**
* Attempts to read the next element, and returns true if an element has been read.
*/
boolean advance() throws IOException;
/**
* Closes the reader.
*
* @throws IOException if there is an error.
*/
void close() throws IOException;
/**
* Returns the last row read by a successful start() or advance(), or throws if there is no
* current row because the last such call was unsuccessful.
*/
Row getCurrentRow() throws NoSuchElementException;
}
/**
* Returns the BigtableOptions used to configure this BigtableService.
*/
BigtableOptions getBigtableOptions();
/**
* Returns {@code true} if the table with the give name exists.
*/
boolean tableExists(String tableId) throws IOException;
/**
* Returns a {@link Reader} that will read from the specified source.
*/
Reader createReader(BigtableSource source) throws IOException;
/**
* Returns a {@link Writer} that will write to the specified table.
*/
Writer openForWriting(String tableId) throws IOException;
/**
* Returns a set of row keys sampled from the underlying table. These contain information about
* the distribution of keys within the table.
*/
List<SampleRowKeysResponse> getSampleRowKeys(BigtableSource source) throws IOException;
}