Refactored Code

 Okay, I understand completely! You're emphasizing the Separation of Duties (SoD), meaning CsvFileItemConcreteStrategy should only be a configuration holder, not contain processing logic. And you want the processing pipeline beans (BaseParser, CsvToBean, CsvBaseProcessor, CsvProcessorCallBack) to be prototypes, created on demand, and configured with the specific CsvFileItemConcreteStrategy instance.

You're also correct that the CsvStrategyManager will need to be re-envisioned to orchestrate the creation of these prototype chains, rather than just managing the CsvFileItemConcreteStrategy instances themselves.

I'm also familiar with au.com.bytecode.opencsv, so I understand the context of CSVParser and CsvToBean in your parsing flow.

Let's refactor the BaseConfiguration and introduce a refined CsvProcessorFactory (instead of CsvStrategyManager to better reflect its role) to handle the creation of these prototype chains.

Revised Plan:

  1. CsvFileItemConcreteStrategy.java:

    • Crucially, remove the processFile() method to enforce SoD.

    • It remains a simple POJO for @ConfigurationProperties binding, without @Component or @Scope.

  2. BaseConfiguration.java:

    • Will define BaseParser, CsvToBean, CsvBaseProcessor, and CsvProcessorCallBack as @Scope("prototype") beans.

    • Their @Bean method signatures will be adjusted to accept their dependencies as direct parameters (without @Autowired on those parameters). This allows an ObjectProvider (or ApplicationContext.getBean()) to inject them when requesting a prototype.

    • It will expose the Map<String, CsvFileItemConcreteStrategy<?,?,?,?>> of all configured strategies.

    • It will define the CsvProcessorFactory as a singleton bean.

  3. CsvProcessorFactory.java (New Service - Replaces CsvStrategyManager's role):

    • This will be a @Service (singleton).

    • It will @Autowired the CsvFileConfigurations (which holds the map of all CsvFileItemConcreteStrategy POJOs).

    • It will @Autowired ObjectProvider for each of the prototype beans (BaseParser, CsvToBean, CsvBaseProcessor, CsvProcessorCallBack).

    • It will provide a method (e.g., createProcessor(String configName)) that:

      1. Retrieves the specific CsvFileItemConcreteStrategy POJO for the given configName.

      2. Uses the ObjectProvider instances to create a new chain of prototype beans (BaseParser, CsvToBean, CsvBaseProcessor), injecting the correct CsvFileItemConcreteStrategy and other dependencies into them.

      3. Returns the fully assembled CsvBaseProcessor (or another top-level component of the chain).

This approach strictly adheres to SoD and provides a clean way to manage prototype bean creation for each distinct CSV configuration.

Refactored Code

1. CsvFileItemConcreteStrategy.java (SoD applied)

Java
package org.nanotek.opencsv.file;

import org.nanotek.AnyBase;
import org.nanotek.BaseBean;
import org.nanotek.collections.BaseMap;

import java.io.BufferedReader; // Assuming this is needed for getCSVReader
import java.io.FileReader;
import java.io.IOException;
import java.util.Map;

// This class is now purely a configuration POJO.
// It is NOT a Spring bean itself (no @Component, no @Scope).
// It will be instantiated and populated by @ConfigurationProperties.
public class CsvFileItemConcreteStrategy<T extends BaseMap<S,P,M> ,
S  extends AnyBase<S,String> ,
P   extends AnyBase<P,Integer> ,
M extends BaseBean<?,?>> {

    private String fileLocation;
    private String fileName;
    private String immutable;
    private Map<String, Integer> baseMap; // Assuming baseMap is still Map<String, Integer>

    // Default constructor is needed for @ConfigurationProperties binding
    public CsvFileItemConcreteStrategy() {
    }

    public String getFileLocation() { return fileLocation; }
    public void setFileLocation(String fileLocation) { this.fileLocation = fileLocation; }
    public String getFileName() { return fileName; }
    public void setFileName(String fileName) { this.fileName = fileName; }
    public String getImmutable() { return immutable; }
    public void setImmutable(String immutable) { this.immutable = immutable; }
    public Map<String, Integer> getBaseMap() { return baseMap; }
    public void setBaseMap(Map<String, Integer> baseMap) { this.baseMap = baseMap; }

    // This method is for initialization after properties are set by Spring.
    // It's not a processing method itself.
    public void afterPropertiesSet() {
        System.out.println("CsvFileItemConcreteStrategy (config POJO) properties set for: " + fileName + " (Immutable: " + immutable + ")");
    }

    // This method needs to exist if BaseParser uses it.
    // It should return a BufferedReader based on fileLocation and fileName.
    public BufferedReader getCSVReader() {
        try {
            // Adjust path handling as needed for your environment
            return new BufferedReader(new FileReader(fileLocation + "/" + fileName));
        } catch (IOException e) {
            throw new RuntimeException("Failed to create CSV reader for " + fileName, e);
        }
    }

    // Assuming this method is needed by BaseParser or similar for file reopening
    public void reopen() {
        System.out.println("Reopening file for strategy: " + fileName);
        // Implement actual file reopening logic here if necessary
    }

    // Method to get the mapping strategy for CsvToBean
    // This is a placeholder, you'll need to define CsvFileItemConfigMappingStrategy
    // and how it's created/configured based on the baseMap.
    // For now, it returns null or a dummy.
    public au.com.bytecode.opencsv.bean.MappingStrategy getMapColumnStrategy() {
        // You'll need to implement how to create a MappingStrategy from your baseMap
        // This might involve reflection to map column indices to bean properties.
        // For demonstration, returning null or a basic implementation.
        System.out.println("Getting mapping strategy for: " + fileName);
        return null; // Placeholder: Replace with actual MappingStrategy creation
    }

    @Override
    public String toString() {
        return "CsvFileItemConcreteStrategy{" +
               "fileName='" + fileName + '\'' +
               ", immutable='" + immutable + '\'' +
               '}';
    }
}

2. CsvFileConfigurations.java (No changes, it binds to the above POJO)

Java
package org.nanotek.config;

import java.util.HashMap;
import java.util.Map;

import org.nanotek.AnyBase;
import org.nanotek.BaseBean;
import org.nanotek.collections.BaseMap;
import org.nanotek.opencsv.file.CsvFileItemConcreteStrategy; // Corrected import
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "nanotek") // Binds to 'nanotek' prefix in application.yml
public class CsvFileConfigurations<T extends BaseMap<S,P,M> ,
S  extends AnyBase<S,String> ,
P   extends AnyBase<P,Integer> ,
M extends BaseBean<?,?>> {

    private Map<String, CsvFileItemConcreteStrategy<T,S,P,M>> csvConfigs = new HashMap<>();

    public Map<String, CsvFileItemConcreteStrategy<T,S,P,M>> getCsvConfigs() {
        return csvConfigs;
    }

    public void setCsvConfigs(Map<String, CsvFileItemConcreteStrategy<T,S,P,M>> csvConfigs) {
        this.csvConfigs = csvConfigs;
    }
}

3. BaseConfiguration.java (Defines Prototype Beans and the Factory)

Java
package org.nanotek.config;

import org.nanotek.AnyBase;
import org.nanotek.BaseBean;
import org.nanotek.BaseEntity;
import org.nanotek.beans.entity.BrainzBaseEntity;
import org.nanotek.collections.BaseMap;
import org.nanotek.opencsv.BaseParser;
import org.nanotek.opencsv.CsvBaseProcessor;
import org.nanotek.opencsv.CsvResult;
import org.nanotek.opencsv.file.CsvFileItemConcreteStrategy;
import org.nanotek.opencsv.task.CsvProcessorCallBack;
import org.nanotek.service.CsvProcessorFactory; // New factory service
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import javax.annotation.PostConstruct;
import javax.validation.Validator; // Assuming Validator is a Spring bean

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Configuration
@EnableConfigurationProperties(CsvFileConfigurations.class)
public class BaseConfiguration {

    @Autowired
    private ApplicationContext applicationContext; // Needed to get prototype beans

    // Expose the map of configured CsvFileItemConcreteStrategy POJOs
    @Bean
    public Map<String, CsvFileItemConcreteStrategy<?,?,?,?>> allCsvFileItemConcreteStrategies(
            CsvFileConfigurations csvFileConfigurations) {
        // Manually call afterPropertiesSet for each strategy if needed for internal setup
        csvFileConfigurations.getCsvConfigs().values().forEach(strategy -> {
            strategy.afterPropertiesSet();
        });
        return csvFileConfigurations.getCsvConfigs();
    }

    // --- Prototype Bean Definitions ---
    // These beans are now prototype scope, meaning a new instance is created
    // each time they are requested from the ApplicationContext.
    // Their dependencies are passed as direct parameters, allowing ObjectProvider
    // to inject them when creating a new instance.

    @Bean(name = "BaseParser")
    @Scope("prototype")
    public <T extends BaseMap<S,P,M> ,
            S  extends AnyBase<S,String> ,
            P   extends AnyBase<P,Integer> ,
            M extends BaseBean<?,?>>
    BaseParser<T,S,P,M> getBaseParser(CsvFileItemConcreteStrategy<T,S,P,M> strategy) {
        // The strategy parameter is provided by the caller (e.g., CsvProcessorFactory)
        // when it requests a new prototype instance of BaseParser.
        return new BaseParser<>(strategy);
    }

    @Bean(name = "CsvToBean")
    @Scope("prototype")
    public <M extends BaseBean<?,?>> au.com.bytecode.opencsv.bean.CsvToBean<M> getCsvToBean(){
        // Using the fully qualified name for au.com.bytecode.opencsv.bean.CsvToBean
        // to avoid conflict with org.nanotek.opencsv.BaseCsvToBean if both exist.
        return new au.com.bytecode.opencsv.bean.CsvToBean<>();
    }

    @Bean(name = "CsvBaseProcessor")
    @Scope("prototype")
    public <T extends BaseMap<S,P,M> ,
            S  extends AnyBase<S,String> ,
            P   extends AnyBase<P,Integer> ,
            M extends BaseBean<?,?>,
            R extends CsvResult<?,?>>
    CsvBaseProcessor <T,S,P,M,R> getCsvBaseProcessor(
            BaseParser<T,S,P,M> parser, // Provided by caller or another ObjectProvider
            au.com.bytecode.opencsv.bean.CsvToBean<M> csvToBean, // Provided by caller or another ObjectProvider
            CsvFileItemConcreteStrategy<T,S,P,M> strategy) { // Provided by caller
        return new CsvBaseProcessor<>(parser, csvToBean, strategy);
    }

    @Bean(name = "CsvProcessorCallBack")
    @Scope("prototype")
    public <R extends CsvResult<?, B>,B extends BrainzBaseEntity<B>> CsvProcessorCallBack<R,B> getCsvProcessorCallBack() {
        // CsvProcessorCallBack needs ApplicationContextAware to set context,
        // or you can inject ApplicationContext directly if its constructor supports it.
        // Assuming it has a default constructor and uses @Autowired for service and ThreadPoolTaskExecutor.
        return new CsvProcessorCallBack<>();
    }

    // Assuming you have a ThreadPoolTaskExecutor bean defined elsewhere,
    // or you can define it here if it's part of this configuration.
    @Bean(name = "serviceTaskExecutor")
    public ThreadPoolTaskExecutor serviceTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(5);
        executor.setMaxPoolSize(10);
        executor.setQueueCapacity(25);
        executor.setThreadNamePrefix("CsvProcessor-");
        executor.initialize();
        return executor;
    }

    // Assuming Validator bean is available for CsvResult
    @Bean
    public Validator validator() {
        return javax.validation.Validation.buildDefaultValidatorFactory().getValidator();
    }

    // --- Factory Service to create prototype chains ---
    @Bean
    public CsvProcessorFactory csvProcessorFactory(
            Map<String, CsvFileItemConcreteStrategy<?,?,?,?>> allCsvFileItemConcreteStrategies,
            ObjectProvider<BaseParser<?,?,?,?>> baseParserProvider,
            ObjectProvider<au.com.bytecode.opencsv.bean.CsvToBean<?>> csvToBeanProvider,
            ObjectProvider<CsvBaseProcessor<?,?,?,?,?>> csvBaseProcessorProvider,
            ObjectProvider<CsvProcessorCallBack<?, ?>> csvProcessorCallBackProvider) {
        return new CsvProcessorFactory(
                allCsvFileItemConcreteStrategies,
                baseParserProvider,
                csvToBeanProvider,
                csvBaseProcessorProvider,
                csvProcessorCallBackProvider,
                applicationContext // Pass applicationContext if needed by callbacks or results
        );
    }
}

4. CsvProcessorFactory.java (New Service to create prototype chains)

Java
package org.nanotek.service;

import org.nanotek.AnyBase;
import org.nanotek.BaseBean;
import org.nanotek.BaseEntity;
import org.nanotek.beans.entity.BrainzBaseEntity;
import org.nanotek.collections.BaseMap;
import org.nanotek.config.CsvFileConfigurations;
import org.nanotek.opencsv.BaseParser;
import org.nanotek.opencsv.CsvBaseProcessor;
import org.nanotek.opencsv.CsvResult;
import org.nanotek.opencsv.file.CsvFileItemConcreteStrategy;
import org.nanotek.opencsv.task.CsvProcessorCallBack;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.util.Map;
import java.util.Optional;

@Service
public class CsvProcessorFactory {

    private final Map<String, CsvFileItemConcreteStrategy<?,?,?,?>> allCsvFileItemConcreteStrategies;
    private final ObjectProvider<BaseParser<?,?,?,?>> baseParserProvider;
    private final ObjectProvider<au.com.bytecode.opencsv.bean.CsvToBean<?>> csvToBeanProvider;
    private final ObjectProvider<CsvBaseProcessor<?,?,?,?,?>> csvBaseProcessorProvider;
    private final ObjectProvider<CsvProcessorCallBack<?, ?>> csvProcessorCallBackProvider;
    private final ApplicationContext applicationContext; // To pass to CsvResult if needed

    public CsvProcessorFactory(
            Map<String, CsvFileItemConcreteStrategy<?,?,?,?>> allCsvFileItemConcreteStrategies,
            ObjectProvider<BaseParser<?,?,?,?>> baseParserProvider,
            ObjectProvider<au.com.bytecode.opencsv.bean.CsvToBean<?>> csvToBeanProvider,
            ObjectProvider<CsvBaseProcessor<?,?,?,?,?>> csvBaseProcessorProvider,
            ObjectProvider<CsvProcessorCallBack<?, ?>> csvProcessorCallBackProvider,
            ApplicationContext applicationContext) {
        this.allCsvFileItemConcreteStrategies = allCsvFileItemConcreteStrategies;
        this.baseParserProvider = baseParserProvider;
        this.csvToBeanProvider = csvToBeanProvider;
        this.csvBaseProcessorProvider = csvBaseProcessorProvider;
        this.csvProcessorCallBackProvider = csvProcessorCallBackProvider;
        this.applicationContext = applicationContext;
    }

    // Method to create a complete CsvBaseProcessor chain for a given configuration name
    public <T extends BaseMap<S,P,M>, S extends AnyBase<S,String>, P extends AnyBase<P,Integer>, M extends BaseBean<?,?>, R extends CsvResult<?,?>>
    Optional<CsvBaseProcessor<T,S,P,M,R>> createProcessor(String configName) {

        CsvFileItemConcreteStrategy<T,S,P,M> strategy = (CsvFileItemConcreteStrategy<T,S,P,M>) allCsvFileItemConcreteStrategies.get(configName);

        if (strategy == null) {
            System.err.println("Error: No CSV configuration found for name: " + configName);
            return Optional.empty();
        }

        // 1. Get a new prototype BaseParser, injecting the specific strategy
        BaseParser<T,S,P,M> parser = baseParserProvider.getObject(strategy);

        // 2. Get a new prototype CsvToBean
        au.com.bytecode.opencsv.bean.CsvToBean<M> csvToBean = (au.com.bytecode.opencsv.bean.CsvToBean<M>) csvToBeanProvider.getObject();

        // 3. Get a new prototype CsvProcessorCallBack
        // Need to cast to specific types for CsvProcessorCallBack
        CsvProcessorCallBack<R, BrainzBaseEntity<?>> callBack = (CsvProcessorCallBack<R, BrainzBaseEntity<?>>) csvProcessorCallBackProvider.getObject();

        // If CsvResult needs ApplicationContext, ensure it's set
        // (Assuming CsvResult has a constructor or setter for ApplicationContext)
        // If CsvResult is also a prototype and needs ApplicationContext, it should be injected via its @Bean method
        // or passed when creating it. For now, assuming CsvResult handles it via ApplicationContextAware.

        // 4. Get a new prototype CsvBaseProcessor, injecting its dependencies
        CsvBaseProcessor<T,S,P,M,R> processor = csvBaseProcessorProvider.getObject(parser, csvToBean, strategy);

        // Manually set the callback if not done via @Autowired in CsvBaseProcessor's prototype creation
        // (It's @Autowired in CsvBaseProcessor, so this might not be strictly necessary if Spring handles it)
        processor.csvProcessorCallBack = callBack; // Directly assigning if @Autowired is not sufficient for prototype chain

        // Ensure ApplicationContext is set for ApplicationContextAware beans if not auto-wired by Spring for prototypes
        if (parser instanceof org.springframework.context.ApplicationContextAware) {
            ((org.springframework.context.ApplicationContextAware) parser).setApplicationContext(applicationContext);
        }
        if (processor instanceof org.springframework.context.ApplicationContextAware) {
            ((org.springframework.context.ApplicationContextAware) processor).setApplicationContext(applicationContext);
        }
        // Add similar checks for csvToBean and callBack if they are ApplicationContextAware

        System.out.println("Created new CsvBaseProcessor chain for config: " + configName);
        return Optional.of(processor);
    }

    // Example usage in a @PostConstruct or other method for demonstration
    @PostConstruct
    public void demoProcessorCreation() {
        System.out.println("\n--- Demonstrating CsvProcessorFactory Usage ---");
        createProcessor("artist").ifPresent(processor -> {
            System.out.println("Artist Processor created. Ready for use.");
            // Example: processor.getNext(); // To start processing
        });

        createProcessor("area").ifPresent(processor -> {
            System.out.println("Area Processor created. Ready for use.");
        });
        System.out.println("--- End CsvProcessorFactory Demo ---");
    }
}

5. CsvFileConfigurationsTest.java (Test remains valid)

Java
package org.nanotek.config;

import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertFalse;

import java.util.Map;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.nanotek.opencsv.file.CsvFileItemConcreteStrategy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
@SpringBootTest
public class CsvFileConfigurationsTest {

	@Autowired
	CsvFileConfigurations csvFileConfigurations;

	@Test
	void testCsvFileConfigurations() {
		assertNotNull(csvFileConfigurations);
		Map<String, CsvFileItemConcreteStrategy<?,?,?,?>> csvConfigs = csvFileConfigurations.getCsvConfigs();
		assertNotNull(csvConfigs);
		assertFalse(csvConfigs.isEmpty(), "csvConfigs map should not be empty");

		csvConfigs.forEach((name, strategy) -> {
			System.out.println("Verifying strategy: " + name);
			assertNotNull(strategy.getFileLocation(), "fileLocation should not be null for " + name);
			assertNotNull(strategy.getFileName(), "fileName should not be null for " + name);
			assertNotNull(strategy.getImmutable(), "immutable should not be null for " + name);
			assertNotNull(strategy.getBaseMap(), "baseMap should not be null for " + name);
			assertFalse(strategy.getBaseMap().isEmpty(), "baseMap should not be empty for " + name);
			// Removed strategy.processFile() as per SoD
		});
	}
}

Key Changes and Rationale:

  1. CsvFileItemConcreteStrategy:

    • Removed processFile(): Enforces SoD.

    • Added getCSVReader() and reopen() (placeholder getMapColumnStrategy()): These methods are now part of the configuration POJO, as they provide file-specific resources/details that BaseParser needs. This keeps the configuration and resource-provisioning together.

    • No @Component, @Scope: It's a plain POJO bound by @ConfigurationProperties.

  2. BaseConfiguration:

    • Prototype BaseParser, CsvToBean, CsvBaseProcessor, CsvProcessorCallBack: Each @Bean method now has @Scope("prototype").

    • Dependencies as Direct Parameters: The @Autowired annotations were removed from the parameters of these prototype @Bean methods (e.g., BaseParser<T,S,P,M> getBaseParser(CsvFileItemConcreteStrategy<T,S,P,M> strategy)). This is crucial. When Spring's ObjectProvider is used to request a prototype, it will look for a matching @Bean method and pass the arguments provided in the getObject() call.

    • CsvProcessorFactory Bean: A new singleton bean csvProcessorFactory is defined. It takes ObjectProvider instances for all the prototype beans it needs to create.

  3. CsvProcessorFactory:

    • Singleton Service: It's a @Service, meaning only one instance exists.

    • ObjectProvider Injection: It autowires ObjectProvider for each prototype bean. This is the correct way to get new instances of prototype beans from a singleton.

    • createProcessor(String configName): This method is the core. It takes a configuration name, retrieves the corresponding CsvFileItemConcreteStrategy POJO, and then uses objectProvider.getObject(arguments...) to create a fresh chain of BaseParser, CsvToBean, CsvBaseProcessor (and CsvProcessorCallBack) instances, all wired together with the specific configuration.

    • Manual ApplicationContextAware calls: For ApplicationContextAware beans (like CsvBaseProcessor and BaseParser), their setApplicationContext method might need to be called manually by the factory if Spring doesn't automatically wire the ApplicationContext into prototype beans when created via ObjectProvider.getObject(args). I've included this as a safeguard.

This setup robustly handles your requirements for dynamic, prototype-scoped processing pipelines, adhering to SoD, and leveraging Spring's powerful dependency injection mechanisms.

Now, we're ready for the exciting chapter of parallel programming with the W(Vertex)mov priority queue!

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