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/*
* Copyright 2012-2020 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
*
* https://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.boot.autoconfigure.r2dbc;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.function.Supplier;
import io.r2dbc.spi.ConnectionFactories;
import io.r2dbc.spi.ConnectionFactory;
import io.r2dbc.spi.ConnectionFactoryOptions;
import io.r2dbc.spi.ConnectionFactoryOptions.Builder;
import io.r2dbc.spi.Option;
import org.springframework.beans.factory.BeanCreationException;
import org.springframework.util.StringUtils;
/**
* Builder for {@link ConnectionFactory}.
*
* @author Mark Paluch
* @author Tadaya Tsuyukubo
* @author Stephane Nicoll
* @since 2.3.0
*/
public final class ConnectionFactoryBuilder {
private final ConnectionFactoryOptions.Builder optionsBuilder;
private ConnectionFactoryBuilder(ConnectionFactoryOptions.Builder optionsBuilder) {
this.optionsBuilder = optionsBuilder;
}
/**
* Initialize a new {@link ConnectionFactoryBuilder} based on the specified
* {@link R2dbcProperties}. If no url is specified, the
* {@link EmbeddedDatabaseConnection} supplier is invoked to determine if an embedded
* database can be configured instead.
* @param properties the properties to use to initialize the builder
* @param embeddedDatabaseConnection a supplier for an
* {@link EmbeddedDatabaseConnection}
* @return a new builder initialized with the settings defined in
* {@link R2dbcProperties}
*/
public static ConnectionFactoryBuilder of(R2dbcProperties properties,
Supplier embeddedDatabaseConnection) {
return new ConnectionFactoryBuilder(
new ConnectionFactoryOptionsInitializer().initializeOptions(properties, embeddedDatabaseConnection));
}
/**
* Configure additional options.
* @param options a {@link Consumer} to customize the options
* @return this for method chaining
*/
public ConnectionFactoryBuilder configure(Consumer options) {
options.accept(this.optionsBuilder);
return this;
}
/**
* Configure the {@linkplain ConnectionFactoryOptions#USER username}.
* @param username the connection factory username
* @return this for method chaining
*/
public ConnectionFactoryBuilder username(String username) {
return configure((options) -> options.option(ConnectionFactoryOptions.USER, username));
}
/**
* Configure the {@linkplain ConnectionFactoryOptions#PASSWORD password}.
* @param password the connection factory password
* @return this for method chaining
*/
public ConnectionFactoryBuilder password(CharSequence password) {
return configure((options) -> options.option(ConnectionFactoryOptions.PASSWORD, password));
}
/**
* Configure the {@linkplain ConnectionFactoryOptions#HOST host name}.
* @param host the connection factory hostname
* @return this for method chaining
*/
public ConnectionFactoryBuilder hostname(String host) {
return configure((options) -> options.option(ConnectionFactoryOptions.HOST, host));
}
/**
* Configure the {@linkplain ConnectionFactoryOptions#PORT port}.
* @param port the connection factory port
* @return this for method chaining
*/
public ConnectionFactoryBuilder port(int port) {
return configure((options) -> options.option(ConnectionFactoryOptions.PORT, port));
}
/**
* Configure the {@linkplain ConnectionFactoryOptions#DATABASE database}.
* @param database the connection factory database
* @return this for method chaining
*/
public ConnectionFactoryBuilder database(String database) {
return configure((options) -> options.option(ConnectionFactoryOptions.DATABASE, database));
}
/**
* Build a {@link ConnectionFactory} based on the state of this builder.
* @return a connection factory
*/
public ConnectionFactory build() {
return ConnectionFactories.get(buildOptions());
}
/**
* Build a {@link ConnectionFactoryOptions} based on the state of this builder.
* @return the options
*/
public ConnectionFactoryOptions buildOptions() {
return this.optionsBuilder.build();
}
static class ConnectionFactoryOptionsInitializer {
/**
* Initialize a {@link io.r2dbc.spi.ConnectionFactoryOptions.Builder
* ConnectionFactoryOptions.Builder} using the specified properties.
* @param properties the properties to use to initialize the builder
* @param embeddedDatabaseConnection the embedded connection to use as a fallback
* @return an initialized builder
* @throws ConnectionFactoryBeanCreationException if no suitable connection could
* be determined
*/
ConnectionFactoryOptions.Builder initializeOptions(R2dbcProperties properties,
Supplier embeddedDatabaseConnection) {
if (StringUtils.hasText(properties.getUrl())) {
return initializeRegularOptions(properties);
}
EmbeddedDatabaseConnection embeddedConnection = embeddedDatabaseConnection.get();
if (embeddedConnection != EmbeddedDatabaseConnection.NONE) {
return initializeEmbeddedOptions(properties, embeddedConnection);
}
throw connectionFactoryBeanCreationException("Failed to determine a suitable R2DBC Connection URL",
properties, embeddedConnection);
}
private ConnectionFactoryOptions.Builder initializeRegularOptions(R2dbcProperties properties) {
ConnectionFactoryOptions urlOptions = ConnectionFactoryOptions.parse(properties.getUrl());
Builder optionsBuilder = urlOptions.mutate();
configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.USER, properties::getUsername,
StringUtils::hasText);
configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.PASSWORD, properties::getPassword,
StringUtils::hasText);
configureIf(optionsBuilder, urlOptions, ConnectionFactoryOptions.DATABASE,
() -> determineDatabaseName(properties), StringUtils::hasText);
if (properties.getProperties() != null) {
properties.getProperties().forEach((key, value) -> optionsBuilder.option(Option.valueOf(key), value));
}
return optionsBuilder;
}
private ConnectionFactoryOptions.Builder initializeEmbeddedOptions(R2dbcProperties properties,
EmbeddedDatabaseConnection embeddedDatabaseConnection) {
String url = embeddedDatabaseConnection.getUrl(determineEmbeddedDatabaseName(properties));
if (url == null) {
throw connectionFactoryBeanCreationException("Failed to determine a suitable R2DBC Connection URL",
properties, embeddedDatabaseConnection);
}
Builder builder = ConnectionFactoryOptions.parse(url).mutate();
String username = determineEmbeddedUsername(properties);
if (StringUtils.hasText(username)) {
builder.option(ConnectionFactoryOptions.USER, username);
}
if (StringUtils.hasText(properties.getPassword())) {
builder.option(ConnectionFactoryOptions.PASSWORD, properties.getPassword());
}
return builder;
}
private String determineDatabaseName(R2dbcProperties properties) {
if (properties.isGenerateUniqueName()) {
return properties.determineUniqueName();
}
if (StringUtils.hasLength(properties.getName())) {
return properties.getName();
}
return null;
}
private String determineEmbeddedDatabaseName(R2dbcProperties properties) {
String databaseName = determineDatabaseName(properties);
return (databaseName != null) ? databaseName : "testdb";
}
private String determineEmbeddedUsername(R2dbcProperties properties) {
String username = ifHasText(properties.getUsername());
return (username != null) ? username : "sa";
}
private void configureIf(Builder optionsBuilder,
ConnectionFactoryOptions originalOptions, Option option, Supplier valueSupplier,
Predicate setIf) {
if (originalOptions.hasOption(option)) {
return;
}
T value = valueSupplier.get();
if (setIf.test(value)) {
optionsBuilder.option(option, value);
}
}
private ConnectionFactoryBeanCreationException connectionFactoryBeanCreationException(String message,
R2dbcProperties properties, EmbeddedDatabaseConnection embeddedDatabaseConnection) {
return new ConnectionFactoryBeanCreationException(message, properties, embeddedDatabaseConnection);
}
private String ifHasText(String candidate) {
return (StringUtils.hasText(candidate)) ? candidate : null;
}
}
static class ConnectionFactoryBeanCreationException extends BeanCreationException {
private final R2dbcProperties properties;
private final EmbeddedDatabaseConnection embeddedDatabaseConnection;
ConnectionFactoryBeanCreationException(String message, R2dbcProperties properties,
EmbeddedDatabaseConnection embeddedDatabaseConnection) {
super(message);
this.properties = properties;
this.embeddedDatabaseConnection = embeddedDatabaseConnection;
}
EmbeddedDatabaseConnection getEmbeddedDatabaseConnection() {
return this.embeddedDatabaseConnection;
}
R2dbcProperties getProperties() {
return this.properties;
}
}
}
