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MultiTenant on top of SpringBoot
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package io.gitlab.rujal_sh.commons.utils;
import io.gitlab.rujal_sh.annotation.Database_Based_MultiTenancy;
import io.gitlab.rujal_sh.annotation.StrategyType;
import io.gitlab.rujal_sh.annotation.Schema_Based_MultiTenancy;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.stream.Stream;
/**
* @author Rujal Shrestha
*
*/
@Slf4j
@RequiredArgsConstructor
public class Constants {
public static StrategyType strategy;
public static String[] basePackages;
public Constants(ApplicationContext applicationContext) {
ClassPathScanningCandidateComponentProvider scanner =
new ClassPathScanningCandidateComponentProvider(false);
scanner.addIncludeFilter(new AnnotationTypeFilter(Database_Based_MultiTenancy.class));
scanner.addIncludeFilter(new AnnotationTypeFilter(Schema_Based_MultiTenancy.class));
List autoConfigurationPackage = AutoConfigurationPackages.get(applicationContext.getAutowireCapableBeanFactory());
String rootPackageName = autoConfigurationPackage.get(0).substring(0, autoConfigurationPackage.get(0).split("\\.")[0].length());
Set candidates = scanner.findCandidateComponents(rootPackageName);
if (candidates.size() != 1) {
if (candidates.size() != 0) {
throw new RuntimeException("Either @Database_Based_MultiTenancy OR @Schema_Based_MultiTenancy should be used in Application");
} else {
log.info("MultiTenancy feature is Disabled");
}
} else {
log.info("Bootstrapping Spring MultiTenancy");
for (BeanDefinition bd : candidates) {
try {
Database_Based_MultiTenancy annotation = Class.forName(bd.getBeanClassName()).getAnnotation(Database_Based_MultiTenancy.class);
if (annotation==null){
basePackages = Class.forName(bd.getBeanClassName()).getAnnotation(Schema_Based_MultiTenancy.class).basePackages();
strategy = StrategyType.SCHEMA;
}else{
basePackages = annotation.basePackages();
strategy = StrategyType.DATABASE;
}
basePackages = Stream.concat(Arrays.stream(basePackages), Arrays.stream(new String[]{"io.gitlab.rujal_sh.database"})).toArray(String[]::new);
log.info("Using MultiTenancy BasePackage to Scan: {}", basePackages);
log.info("Using MultiTenancy Strategy: {}", strategy);
} catch (ClassNotFoundException var11) {
log.error("Error in Detecting @EnableMultiTenancy annotation implementation");
}
}
}
}
}