Added a sample that illustrates using multiple DataSources

This PR adds a sample that illustrates the use of multiple DataSources
in a single Spring Cloud Task application.

Resolves #413

Updated based on code review

spring-cloud-task-samples/multiple-datasources/src/main/java/io/spring/MultipleDataSourcesApplication.java

@@ -0,0 +1,35 @@
+/*
+ *  Copyright 2018 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
+ *
+ *          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 io.spring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.task.configuration.EnableTask;
+
+
+/**
+ * @author Michael Minella
+ */
+@SpringBootApplication
+@EnableTask
+public class MultipleDataSourcesApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(MultipleDataSourcesApplication.class, args);
+	}
+
+}

spring-cloud-task-samples/multiple-datasources/src/main/java/io/spring/configuration/CustomTaskConfigurer.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2018 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
+ *
+ *      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 io.spring.configuration;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.cloud.task.configuration.DefaultTaskConfigurer;
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Michael Minella
+ */
+@Component
+public class CustomTaskConfigurer extends DefaultTaskConfigurer {
+
+	@Autowired
+	public CustomTaskConfigurer(@Qualifier("secondDataSource") DataSource dataSource) {
+		super(dataSource);
+	}
+}

spring-cloud-task-samples/multiple-datasources/src/main/java/io/spring/configuration/DataSourceConfiguration.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2018 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
+ *
+ *      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 io.spring.configuration;
+
+import javax.sql.DataSource;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+
+/**
+ * @author Michael Minella
+ */
+@Configuration
+public class DataSourceConfiguration {
+
+	@Bean
+	public DataSource dataSource() {
+		return new EmbeddedDatabaseBuilder()
+				.setType(EmbeddedDatabaseType.HSQL)
+				.build();
+	}
+
+	@Bean
+	public DataSource secondDataSource() {
+		return new EmbeddedDatabaseBuilder()
+				.setType(EmbeddedDatabaseType.H2)
+				.build();
+	}
+}

spring-cloud-task-samples/multiple-datasources/src/main/java/io/spring/task/SampleCommandLineRunner.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2018 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
+ *
+ *      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 io.spring.task;
+
+import java.util.List;
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Michael Minella
+ */
+@Component
+public class SampleCommandLineRunner implements CommandLineRunner {
+
+	private List<DataSource> dataSources;
+
+	@Autowired
+	public SampleCommandLineRunner(List<DataSource> dataSources) {
+		this.dataSources = dataSources;
+	}
+
+	@Override
+	public void run(String... args) throws Exception {
+		System.out.println("There are " + dataSources.size() +
+				" DataSources within this application");
+	}
+}

spring-cloud-task-samples/multiple-datasources/src/main/resources/application.properties

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+spring.application.name=Demo Multiple DataSources Task
+logging.level.org.springframework.cloud.task=DEBUG

spring-cloud-task-samples/multiple-datasources/src/test/java/io/spring/MultiDataSourcesApplicationTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2018 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
+ *
+ *      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 io.spring;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.test.rule.OutputCapture;
+
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Michael Minella
+ */
+public class MultiDataSourcesApplicationTests {
+
+	@Rule
+	public OutputCapture outputCapture = new OutputCapture();
+
+	@Test
+	public void testTimeStampApp() throws Exception {
+
+		SpringApplication.run(MultipleDataSourcesApplication.class, new String[0]);
+
+		String output = this.outputCapture.toString();
+
+		assertTrue("Unable to find CommandLineRunner output: " + output,
+				output.contains("There are 2 DataSources within this application"));
+		assertTrue("Unable to find start task message: " + output,
+				output.contains("Creating: TaskExecution{"));
+		assertTrue("Unable to find update task message: " + output,
+				output.contains("Updating: TaskExecution"));
+	}
+}

spring-cloud-task-samples/multiple-datasources/src/test/resources/application.properties

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+#
+# Copyright 2016 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
+#
+#      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.
+#
+
+spring.application.name=Demo Multiple DataSources Task
+logging.level.org.springframework.cloud.task=DEBUG