I use Spring and Hibernate for my application and want to load some configuration data from DB when the application launches. But the question is how I can update the preloaded data in case the record in DB is updated (btw, I use mysql for the DB).
I found some solutions said using the trigger in mysql, but I don't know whether the trigger can call some WebService all send some events to tell the application.
Are there some more solutions or good ideas for the case?
Here's the sample code of preloading data:
#Service
public class PreloadService {
#Autowired
private ConfigurationDao configurationDao;
private Map<String, String> preloadConfs = null;
#PostConstruct
public void getConfigurations() {
Map<String, String> results = new HashMap<String, String>();
List<Configuration> confs = configurationDao.findConfigurations(null, null);
for (Configuration c: confs) {
results.put(c.getCode(), c.getDescription());
}
preloadConfs = results;
}
public String getDescription(String code) {
return preloadConfs.get(code);
}
}
and other class should use the class like this
#Autowired
private PreloadService preloadService;
public void foo() {
preloadService.getDescription("code");
}
So the question is how I can update the preloadConfs object if the configuration table was changed?
Related
Spring boot Is there any way to create Jdbctemplate at runtime pointing to the different MySQL databases?
Runtime I do have all the required information.
The database structure is the same for all the clients but the instance is different.
I also tried with How to create multiple Jdbctemplate beans, pointing to different Mysql databases, in runtime?
but not able to find any solution.
I guess this can be done like this:
#Component
public class JdbcTemplateProvider {
private final Map<String, DataSource> databaseNameToDataSourceMap;
private final JdbcProperties properties;
public JdbcTemplateProvider(List<DataSource> dataSources, JdbcProperties properties) {
this.databaseNameToDataSourceMap = this.buildDatabaseToDataSourceMap(dataSources);
this.properties = properties;
}
public JdbcTemplate byDatabaseName(String database) {
DataSource dataSource = this.databaseNameToDataSourceMap.get(database);
return buildJdbcTemplate(dataSource);
}
private Map<String, DataSource> buildDatabaseToDataSourceMap(List<DataSource> dataSources) {
return new ConcurrentHashMap<>();
}
private JdbcTemplate buildJdbcTemplate(DataSource dataSource) {
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
JdbcProperties.Template template = properties.getTemplate();
jdbcTemplate.setFetchSize(template.getFetchSize());
jdbcTemplate.setMaxRows(template.getMaxRows());
if (template.getQueryTimeout() != null) {
jdbcTemplate.setQueryTimeout((int) template.getQueryTimeout().getSeconds());
}
return jdbcTemplate;
}
}
If this question was if Spring Boot can natively handle this, as far as I know there may not be any built in solution for this.
org.springframework.boot.autoconfigure.jdbc.JdbcProperties reads properties values with prefix spring.jdbc.If it is available in your classpath, this will be able to configure newly built JdbcTemplate instances as per configuration.
You will have build your own logic though to build map of database name to datasource.
I am trying to write integration test case for one of my rest application which uses mongodb internally to persist the data
#DataMongoTest
#SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
public class MainControllerTest {
#LocalServerPort
private int port = 8080;
/* some test cases*/
}
but I am getting below error
java.lang.IllegalStateException: Configuration error: found multiple declarations of #BootstrapWith for test class [com.sample.core.controller.MainControllerTest]: [#org.springframework.test.context.BootstrapWith(value=class org.springframework.boot.test.autoconfigure.data.mongo.DataMongoTestContextBootstrapper), #org.springframework.test.context.BootstrapWith(value=class org.springframework.boot.test.context.SpringBootTestContextBootstrapper)]
looks like these two are mutually exclusive, so how to do the integration testing .
Use #AutoConfigureDataMongo with #SpringBootTest and this will resolve this ambiguity issue. #SpringBootTest and #DataMongoTest cannot be used together.
Answering to a very old post hoping it may help others.
#AutoConfigureDataMongo will connect to real database. In order to still use the embedded mongo, one can initiate the embedded mongoDb manually.
#SpringBootTest(classes = SubscriptionEventApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class SubscriptionEventApiIntegrationTest {
#BeforeAll
static void setup() throws Exception {
startEmbeddedMongoDbManually();
}
private static void startEmbeddedMongoDbManually() throws IOException {
final String connectionString = "mongodb://%s:%d";
final String ip = "localhost";
final int port = 27017;
ImmutableMongodConfig mongodConfig = MongodConfig
.builder()
.version(Version.V3_5_5)
.net(new Net(ip, port, Network.localhostIsIPv6()))
.build();
MongodStarter starter = MongodStarter.getDefaultInstance();
mongodExecutable = starter.prepare(mongodConfig);
mongodExecutable.start();
mongoTemplate = new MongoTemplate(MongoClients.create(String.format(connectionString, ip, port)), "test");
}
#AfterAll
static void clean() {
mongodExecutable.stop();
}
#Test
public void test() {
.....
}
}
Purushothaman suggested starting embedded MongoDB server manually. I am suggesting to start it automatically using #DataMongoTest, but creating WebTestClient manually instead.
Kotlin code below, translates to Java trivially:
#DataMongoTest
// #ContextConfiguration may not be needed for your case.
#ContextConfiguration(
classes = [
Application::class,
MainController::class,
// Add more needed classes for your tests here.
// ...
]
)
#TestPropertySource(properties = ["spring.mongodb.embedded.version=4.0.12"])
class MainControllerTest(
#Autowired
private val mainController: MainController,
// Add more beans needed for your tests here.
// ...
) {
// Creating a WebTestClient is easy and
// can be done in different ways.
// Here is one of the possible ways.
private val webTestClient: WebTestClient =
WebTestClient.bindToController(mainController).build()
#Test
fun someTest() {
// ...
}
}
I'm creating a multi tenant spring boot - JPA application.
In this application, I want to connect to MySQL Databases using DB name which is sent through API request as header.
I checked many multi tenant project samples online but still can't figure out a solution.
Can anyone suggest me a way to do this?
You can use AbstractRoutingDataSource to achieve this. AbstractRoutingDataSource requires information to know which actual DataSource to route to(referred to as Context), which is provided by determineCurrentLookupKey() method. Using example from here.
Define Context like:
public enum ClientDatabase {
CLIENT_A, CLIENT_B
}
Then you need to define Context Holder which will be used in determineCurrentLookupKey()
public class ClientDatabaseContextHolder {
private static ThreadLocal<ClientDatabase> CONTEXT = new ThreadLocal<>();
public static void set(ClientDatabase clientDatabase) {
Assert.notNull(clientDatabase, "clientDatabase cannot be null");
CONTEXT.set(clientDatabase);
}
public static ClientDatabase getClientDatabase() {
return CONTEXT.get();
}
public static void clear() {
CONTEXT.remove();
}
}
Then you can extend AbstractRoutingDataSource like below:
public class ClientDataSourceRouter extends AbstractRoutingDataSource {
#Override
protected Object determineCurrentLookupKey() {
return ClientDatabaseContextHolder.getClientDatabase();
}
}
Finally, DataSource bean configuration:
#Bean
public DataSource clientDatasource() {
Map<Object, Object> targetDataSources = new HashMap<>();
DataSource clientADatasource = clientADatasource();
DataSource clientBDatasource = clientBDatasource();
targetDataSources.put(ClientDatabase.CLIENT_A,
clientADatasource);
targetDataSources.put(ClientDatabase.CLIENT_B,
clientBDatasource);
ClientDataSourceRouter clientRoutingDatasource
= new ClientDataSourceRouter();
clientRoutingDatasource.setTargetDataSources(targetDataSources);
clientRoutingDatasource.setDefaultTargetDataSource(clientADatasource);
return clientRoutingDatasource;
}
https://github.com/wmeints/spring-multi-tenant-demo
Following this logic, I can solve it now. Some of the versions need to be upgraded and the codes as well.
Spring Boot version have changed.
org.springframework.boot
spring-boot-starter-parent
2.1.0.RELEASE
Mysql version has been removed.
And some small changed in MultitenantConfiguration.java
#Configuration
public class MultitenantConfiguration {
#Autowired
private DataSourceProperties properties;
/**
* Defines the data source for the application
* #return
*/
#Bean
#ConfigurationProperties(
prefix = "spring.datasource"
)
public DataSource dataSource() {
File[] files = Paths.get("tenants").toFile().listFiles();
Map<Object,Object> resolvedDataSources = new HashMap<>();
if(files != null) {
for (File propertyFile : files) {
Properties tenantProperties = new Properties();
DataSourceBuilder dataSourceBuilder = DataSourceBuilder.create(this.getClass().getClassLoader());
try {
tenantProperties.load(new FileInputStream(propertyFile));
String tenantId = tenantProperties.getProperty("name");
dataSourceBuilder.driverClassName(properties.getDriverClassName())
.url(tenantProperties.getProperty("datasource.url"))
.username(tenantProperties.getProperty("datasource.username"))
.password(tenantProperties.getProperty("datasource.password"));
if (properties.getType() != null) {
dataSourceBuilder.type(properties.getType());
}
resolvedDataSources.put(tenantId, dataSourceBuilder.build());
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
// Create the final multi-tenant source.
// It needs a default database to connect to.
// Make sure that the default database is actually an empty tenant database.
// Don't use that for a regular tenant if you want things to be safe!
MultitenantDataSource dataSource = new MultitenantDataSource();
dataSource.setDefaultTargetDataSource(defaultDataSource());
dataSource.setTargetDataSources(resolvedDataSources);
// Call this to finalize the initialization of the data source.
dataSource.afterPropertiesSet();
return dataSource;
}
/**
* Creates the default data source for the application
* #return
*/
private DataSource defaultDataSource() {
DataSourceBuilder dataSourceBuilder = DataSourceBuilder.create(this.getClass().getClassLoader())
.driverClassName(properties.getDriverClassName())
.url(properties.getUrl())
.username(properties.getUsername())
.password(properties.getPassword());
if(properties.getType() != null) {
dataSourceBuilder.type(properties.getType());
}
return dataSourceBuilder.build();
}
}
This change is here due to the DataSourceBuilder has been moved to another path and its constructor has been changed.
Also changed the MySQL driver class name in application.properties like this
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
I need to insert a data multiple times in an web application. I am using selenium with testNG along with data driven framework.
I am using CSV file for reading the the input values.
Please find the sample code below.
public class TestData
{
private static String firstName;
public static String lastName;
#BeforeClass
public void beforeClass() throws IOException
{
reader = new CSVReader(new FileReader(fileName));
while((record = reader.readNext()) != null)
{
firstName = record[0];
lastName = record[1];
}
}
#Test
public void test1()
{
driver.findElement(By.id(id)).sendKeys(firstName);
driver.findElement(By.id(id)).click();
and so on....
}
#Test
public void test2()
{
driver.findElement(By.id(id)).sendKeys(lastName);
driver.findElement(By.id(id)).click();
and so on....
}
}
Here, I need to insert 3 records, but when I use the above code, only the 3rd record gets inserted.
Kindly help me to fix this issue.
Sample Input File
What you need here is a Factory powered by a DataProvider. The Factory would produce test class instances (A test class here is basically a regular class that contains one or more #Test methods housed in it). The data provider would basically feed the factory method with the data required to instantiate the test class.
Now your #Test methods would basically work with the data members in the instances to run its logic.
Here's a simple sample that shows this in action.
import org.assertj.core.api.Assertions;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Factory;
import org.testng.annotations.Test;
public class TestClassSample {
private String firstName;
private String lastName;
#Factory(dataProvider = "dp")
public TestClassSample(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
#DataProvider(name = "dp")
public static Object[][] getData() {
//feel free to replace this with the logic that reads up a csv file (using CSVReader)
// and then translates it to a 2D array.
return new Object[][]{
{"Mohan", "Kumar"},
{"Kane", "Williams"},
{"Mark", "Henry"}
};
}
#Test
public void test1() {
Assertions.assertThat(this.firstName).isNotEmpty();
}
#Test
public void test2() {
Assertions.assertThat(this.lastName).isNotEmpty();
}
}
As per the data given by you , the while loop ends at the third record of CSV file. In each iteration your variables "firstName" and "lastName" are overwritten.
When the loop breaks , the variables store the lastly written values. So , use a better data structure for storing all values. I recommend map.
You can further club all the test cases in a single method , use invocationcount attribute in #Test annotation to repeat the execution for each entry from map. Add one more method with #BeforeTest for increment to next keyset in map.
I am trying to write a JUnit test with service dependencies being injected.
protected MainClassApplicationUnderTest aut = new MainClassApplicationUnderTest(App.class) {
#Override
protected void addImpositions(final ImpositionsSpec impositions) {
impositions.add(UserRegistryImposition.of(appRegistry -> {
// Allow modifying Injector in tests
return appRegistry.join(Guice.registry(injector));
}));
}
};
private Injector injector = com.google.inject.Guice.createInjector(new Module());
#Before
public void setup () {
injector.injectMembers(this);
}
#After
public void tearDown() {
aut.close();
}
and then using injected services in my test classes:
#Inject
private UserService userService;
This was working fine until I started adding persistence to my app with HikariModule. Now Guice registry creation is a bit more complex:
.join(Guice.registry(b -> b
.module(HikariModule.class, hikariConfig -> {
final String dbUrl = System.getenv("JDBC_DATABASE_URL");
hikariConfig.setJdbcUrl(dbUrl);
})
.module(Module.class)
.bind(DbMigrator.class)
).apply(r))
Because my registry now consists of multiple modules if I have a service that depends on DataSource class coming from HikariModule guice injection fails in tests.
My goal is to allow writing tests in the following fashion:
#Inject // <- not required can be done in #Before method
private UserService userService; // <- Inject it somehow from Application under test
#Test
public void testUser() {
final Result<User, String> userResult = userService.create(new User.Registration());
final ReceivedResponse res = aut.getHttpClient().get("/users/" + user.userId);
assertEquals(200, res.getStatusCode());
}
What is the right approach of injecting service dependencies in tests? I would very much prefer reusing guice modules from MainClassApplicationUnderTest rather than creating my own and overriding them.
After quite some time battling with this issue and help from Ratpack slack I managed to pull this off.
First of all we need to capture our application registry in the local variable.
private Registry appRegistry;
protected MainClassApplicationUnderTest aut = new MainClassApplicationUnderTest(App.class) {
#Override
protected void addImpositions(final ImpositionsSpec impositions) {
impositions.add(UserRegistryImposition.of(r -> {
appRegistry = r;
return Registry.empty();
}));
}
};
It turns out there is a nifty method that starts the application. So when injecting the class we will know that Registry will not be null and we can inject classes.
protected <T> T inject(final Class<T> classOf) {
aut.getAddress();
return appRegistry.get(classOf);
}
Then in test classes we can simply inject any class that is present in the registry.
final UserService userService = inject(UserService.class);
// OR
final DataSource dataSource = inject(DataSource.class);