java config added

spring-integration/src/main/java/com/baeldung/tx/TxIntegrationConfig.java

@@ -0,0 +1,156 @@
+package com.baeldung.tx;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.support.AbstractApplicationContext;
+import org.springframework.expression.common.LiteralExpression;
+import org.springframework.integration.annotation.InboundChannelAdapter;
+import org.springframework.integration.annotation.Poller;
+import org.springframework.integration.annotation.ServiceActivator;
+import org.springframework.integration.annotation.Transformer;
+import org.springframework.integration.channel.DirectChannel;
+import org.springframework.integration.config.EnableIntegration;
+import org.springframework.integration.core.MessageSource;
+import org.springframework.integration.dsl.Pollers;
+import org.springframework.integration.file.FileReadingMessageSource;
+import org.springframework.integration.file.filters.SimplePatternFileListFilter;
+import org.springframework.integration.file.transformer.FileToStringTransformer;
+import org.springframework.integration.scheduling.PollerMetadata;
+import org.springframework.integration.transaction.DefaultTransactionSynchronizationFactory;
+import org.springframework.integration.transaction.ExpressionEvaluatingTransactionSynchronizationProcessor;
+import org.springframework.integration.transaction.TransactionInterceptorBuilder;
+import org.springframework.integration.transaction.TransactionSynchronizationFactory;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.datasource.DataSourceTransactionManager;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+import org.springframework.messaging.MessageChannel;
+import org.springframework.transaction.interceptor.TransactionInterceptor;
+
+import javax.sql.DataSource;
+import java.io.File;
+import java.util.Scanner;
+
+@Configuration
+@EnableIntegration
+public class TxIntegrationConfig {
+
+    private final Logger log = LoggerFactory.getLogger(this.getClass());
+
+    public final String INPUT_DIR = "/tmp/tx/";
+    public final String FILE_PATTERN = "*.txt";
+
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    @Autowired
+    private DataSource dataSource;
+
+    @Autowired
+    private TransactionSynchronizationFactory transactionSynchronizationFactory;
+
+    @Autowired
+    DataSourceTransactionManager txManager;
+
+    @Bean
+    public MessageChannel inputChannel() {
+        return new DirectChannel();
+    }
+
+    @Bean
+    @InboundChannelAdapter(value = "inputChannel", poller = @Poller(value = "pollerMetadata"))
+    public MessageSource<File> fileReadingMessageSource() {
+        FileReadingMessageSource sourceReader = new FileReadingMessageSource();
+        sourceReader.setDirectory(new File(INPUT_DIR));
+        sourceReader.setFilter(new SimplePatternFileListFilter(FILE_PATTERN));
+        return sourceReader;
+    }
+
+    @Bean
+    public PollerMetadata pollerMetadata() {
+        return Pollers
+                .fixedDelay(5000)
+                .advice(transactionInterceptor())
+                .transactionSynchronizationFactory(transactionSynchronizationFactory)
+                .get();
+    }
+
+    private TransactionInterceptor transactionInterceptor() {
+        return new TransactionInterceptorBuilder()
+                .transactionManager(txManager)
+                .build();
+    }
+
+    @Bean
+    public TransactionSynchronizationFactory transactionSynchronizationFactory(){
+        ExpressionEvaluatingTransactionSynchronizationProcessor transactionSynchronizationProcessor =
+            new ExpressionEvaluatingTransactionSynchronizationProcessor();
+        transactionSynchronizationProcessor.setAfterCommitExpression(
+            new LiteralExpression("payload.renameTo(new java.io.File(payload.absolutePath + '.PASSED'))"));
+        transactionSynchronizationProcessor.setAfterRollbackExpression(
+            new LiteralExpression("payload.renameTo(new java.io.File(payload.absolutePath + '.FAILED'))"));
+        return new DefaultTransactionSynchronizationFactory(transactionSynchronizationProcessor);
+    }
+
+    @Bean
+    @Transformer(inputChannel = "inputChannel", outputChannel = "toServiceChannel")
+    public FileToStringTransformer fileToStringTransformer() {
+        return new FileToStringTransformer();
+    }
+
+    @ServiceActivator(inputChannel = "toServiceChannel")
+    public void serviceActivator(String payload) {
+
+        jdbcTemplate.update("insert into STUDENT values(?)", payload);
+
+        if (payload.toLowerCase().startsWith("fail")) {
+            log.error("Service failure. Test result: {} ", payload);
+            throw new RuntimeException("Service failure.");
+        }
+
+        log.info("Service success. Test result: {}", payload);
+    }
+
+    @Bean
+    public JdbcTemplate jdbcTemplate(DataSource dataSource) {
+        return new JdbcTemplate(dataSource);
+    }
+
+    @Bean
+    public DataSource dataSource() {
+        return new EmbeddedDatabaseBuilder()
+                .setType(EmbeddedDatabaseType.H2)
+                .addScript("classpath:table.sql")
+                .build();
+    }
+
+    @Bean
+    public DataSourceTransactionManager txManager() {
+        return new DataSourceTransactionManager(dataSource);
+    }
+
+    public static void main(final String... args) {
+        final AbstractApplicationContext context = new AnnotationConfigApplicationContext(TxIntegrationConfig.class);
+        context.registerShutdownHook();
+
+        final Scanner scanner = new Scanner(System.in);
+        System.out.print("Integration flow is running. Type q + <enter> to quit ");
+        while (true) {
+            final String input = scanner.nextLine();
+            if ("q".equals(input.trim())) {
+                context.close();
+                scanner.close();
+                break;
+            }
+        }
+        System.exit(0);
+    }
+
+}
+    
+
+