move datasource routing example to spring-jpa module (#3076)

spring-boot/src/main/java/org/baeldung/dsrouting/ClientDao.java

@@ -1,29 +0,0 @@
-package org.baeldung.dsrouting;
-
-import javax.sql.DataSource;
-
-import org.springframework.jdbc.core.JdbcTemplate;
-import org.springframework.jdbc.core.RowMapper;
-
-/**
- * Database access code for datasource routing example.
- */
-public class ClientDao {
-
-    private static final String SQL_GET_CLIENT_NAME = "select name from client";
-
-    private final JdbcTemplate jdbcTemplate;
-
-    public ClientDao(DataSource datasource) {
-        this.jdbcTemplate = new JdbcTemplate(datasource);
-    }
-
-    public String getClientName() {
-        return this.jdbcTemplate.query(SQL_GET_CLIENT_NAME, rowMapper)
-            .get(0);
-    }
-
-    private static RowMapper<String> rowMapper = (rs, rowNum) -> {
-        return rs.getString("name");
-    };
-}

spring-boot/src/main/java/org/baeldung/dsrouting/ClientDataSourceRouter.java

@@ -1,14 +0,0 @@
-package org.baeldung.dsrouting;
-
-import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
-
-/**
- * Returns thread bound client lookup key for current context.
- */
-public class ClientDataSourceRouter extends AbstractRoutingDataSource {
-
-    @Override
-    protected Object determineCurrentLookupKey() {
-        return ClientDatabaseContextHolder.getClientDatabase();
-    }
-}

spring-boot/src/main/java/org/baeldung/dsrouting/ClientDatabase.java

@@ -1,7 +0,0 @@
-package org.baeldung.dsrouting;
-
-public enum ClientDatabase {
-
-    CLIENT_A, CLIENT_B
-
-}

spring-boot/src/main/java/org/baeldung/dsrouting/ClientDatabaseContextHolder.java

@@ -1,26 +0,0 @@
-package org.baeldung.dsrouting;
-
-import org.springframework.util.Assert;
-
-/**
- * Thread shared context to point to the datasource which should be used. This
- * enables context switches between different clients.
- */
-public class ClientDatabaseContextHolder {
-
-    private static final 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();
-    }
-
-}

spring-boot/src/main/java/org/baeldung/dsrouting/ClientService.java

@@ -1,21 +0,0 @@
-package org.baeldung.dsrouting;
-
-/**
- * Service layer code for datasource routing example.  Here, the service methods are responsible
- * for setting and clearing the context.
- */
-public class ClientService {
-
-    private final ClientDao clientDao;
-
-    public ClientService(ClientDao clientDao) {
-        this.clientDao = clientDao;
-    }
-
-    public String getClientName(ClientDatabase clientDb) {
-        ClientDatabaseContextHolder.set(clientDb);
-        String clientName = this.clientDao.getClientName();
-        ClientDatabaseContextHolder.clear();
-        return clientName;
-    }
-}