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JDBC Driver for Google Cloud Spanner
/*
* Copyright 2017 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 nl.topicus.jdbc.shaded.com.google.cloud.spanner;
import nl.topicus.jdbc.shaded.com.google.common.base.Preconditions;
/** Specifies options for various spanner operations */
public final class Options {
/** Marker interface to mark options applicable to both Read and Query operations */
public interface ReadAndQueryOption extends ReadOption, QueryOption {}
/** Marker interface to mark options applicable to read operation */
public interface ReadOption {}
/** Marker interface to mark options applicable to query operation. */
public interface QueryOption {}
/** Marker interface to mark options applicable to list operations in admin API. */
public interface ListOption {}
/**
* Specifying this will cause the read to yield at most this many rows. This should be greater
* than 0.
*/
public static ReadOption limit(long limit) {
Preconditions.checkArgument(limit > 0, "Limit should be greater than 0");
return new LimitOption(limit);
}
/**
* Specifying this will allow the client to prefetch up to {@code prefetchChunks} {@code
* PartialResultSet} chunks for read and query. The data size of each chunk depends on the server
* implementation but a good rule of thumb is that each chunk will be up to 1 MiB. Larger values
* reduce the likelihood of blocking while consuming results at the cost of greater memory
* consumption. {@code prefetchChunks} should be greater than 0. To get good performance choose a
* value that is large enough to allow buffering of chunks for an entire row. Apart from the
* buffered chunks, there can be at most one more row buffered in the client.
*/
public static ReadAndQueryOption prefetchChunks(int prefetchChunks) {
Preconditions.checkArgument(prefetchChunks > 0, "prefetchChunks should be greater than 0");
return new FlowControlOption(prefetchChunks);
}
/**
* Specifying this will cause the list operations to fetch at most this many records in a page.
*/
public static ListOption pageSize(int pageSize) {
return new PageSizeOption(pageSize);
}
/**
* Specifying this will cause the list operation to start fetching the record from this onwards.
*/
public static ListOption pageToken(String pageToken) {
return new PageTokenOption(pageToken);
}
/**
* Specifying this will cause the given filter to be applied to the list operation. List
* operations that support this options are:
*
*
* - {@link InstanceAdminClient#listInstances}
*
*
* If this option is passed to any other list operation, it will throw an
* IllegalArgumentException.
*
* @param filter An expression for filtering the results of the request. Filter rules are case
* insensitive. Some examples of using filters are:
*
* - name:* The entity has a name.
*
- name:Howl The entity's name contains "howl".
*
- name:HOWL Equivalent to above.
*
- NAME:howl Equivalent to above.
*
- labels.env:* The entity has the label env.
*
- labels.env:dev The entity has a label env whose value contains "dev".
*
- name:howl labels.env:dev The entity's name contains "howl" and it has the label env
* whose value contains "dev".
*
*/
public static ListOption filter(String filter) {
return new FilterOption(filter);
}
/** Option pertaining to flow control. */
static final class FlowControlOption extends InternalOption implements ReadAndQueryOption {
final int prefetchChunks;
FlowControlOption(int prefetchChunks) {
this.prefetchChunks = prefetchChunks;
}
int prefetchChunks() {
return prefetchChunks;
}
@Override
void appendToOptions(Options options) {
options.prefetchChunks = prefetchChunks;
}
}
private Long limit;
private Integer prefetchChunks;
private Integer pageSize;
private String pageToken;
private String filter;
// Construction is via factory methods below.
private Options() {}
boolean hasLimit() {
return limit != null;
}
long limit() {
return limit;
}
boolean hasPrefetchChunks() {
return prefetchChunks != null;
}
int prefetchChunks() {
return prefetchChunks;
}
boolean hasPageSize() {
return pageSize != null;
}
int pageSize() {
return pageSize;
}
boolean hasPageToken() {
return pageToken != null;
}
String pageToken() {
return pageToken;
}
boolean hasFilter() {
return filter != null;
}
String filter() {
return filter;
}
static Options fromReadOptions(ReadOption... options) {
Options readOptions = new Options();
for (ReadOption option : options) {
((InternalOption) option).appendToOptions(readOptions);
}
return readOptions;
}
static Options fromQueryOptions(QueryOption... options) {
Options readOptions = new Options();
for (QueryOption option : options) {
((InternalOption) option).appendToOptions(readOptions);
}
return readOptions;
}
static Options fromListOptions(ListOption... options) {
Options listOptions = new Options();
for (ListOption option : options) {
((InternalOption) option).appendToOptions(listOptions);
}
return listOptions;
}
private abstract static class InternalOption {
abstract void appendToOptions(Options options);
}
static class LimitOption extends InternalOption implements ReadOption {
private final long limit;
LimitOption(long limit) {
this.limit = limit;
}
long limit() {
return limit;
}
@Override
void appendToOptions(Options options) {
options.limit = limit;
}
}
static class PageSizeOption extends InternalOption implements ListOption {
private final int pageSize;
PageSizeOption(int pageSize) {
this.pageSize = pageSize;
}
int pageSize() {
return pageSize;
}
@Override
void appendToOptions(Options options) {
options.pageSize = pageSize;
}
}
static class PageTokenOption extends InternalOption implements ListOption {
private final String pageToken;
PageTokenOption(String pageToken) {
this.pageToken = pageToken;
}
String pageToken() {
return pageToken;
}
@Override
void appendToOptions(Options options) {
options.pageToken = pageToken;
}
}
static class FilterOption extends InternalOption implements ListOption {
private final String filter;
FilterOption(String filter) {
this.filter = filter;
}
@Override
void appendToOptions(Options options) {
options.filter = filter;
}
}
}