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Integration into the Spring Boot framework for CDS Services Java

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/*********************************************************************
 * (C) 2019 SAP SE or an SAP affiliate company. All rights reserved. *
 *********************************************************************/
package com.sap.cds.framework.spring.transaction;

import java.util.Stack;
import java.util.UUID;

import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.interceptor.TransactionAspectSupport;
import org.springframework.transaction.support.DefaultTransactionDefinition;
import org.springframework.transaction.support.TransactionSynchronizationManager;

import com.sap.cds.services.transaction.TransactionManager;

public class SpringTransactionManager implements TransactionManager {

	private final PlatformTransactionManager txMgr;
	private final ThreadLocal> transactions = ThreadLocal.withInitial(() -> new Stack<>());
	private final String name = "spring-" + UUID.randomUUID().toString();

	public SpringTransactionManager(PlatformTransactionManager txMgr) {
		this.txMgr = txMgr;
	}

	@Override
	public boolean isActive() {
		// check global transaction flag and not only transactions managed by us
		return TransactionSynchronizationManager.isActualTransactionActive();
	}

	@Override
	public void begin() {
		// Transactions started before the ChangeSet scope are OK
		// -> ChangeSetContext defines new "Requires New" boundaries
		// Transactions started within the ChangeSet scope but after this begin are OK
		// -> Transactions take part in opened transaction (Requires)
		// Transactions started within the ChangeSet scope but before this begin are OK
		// -> begin is called by the proxy, if transaction with "Requires" is opened
		// !!! Additional "Requires New" might cut the ChangeSet in parts!
		DefaultTransactionDefinition definition = new DefaultTransactionDefinition(
				TransactionDefinition.PROPAGATION_REQUIRES_NEW);
		transactions.get().push(txMgr.getTransaction(definition));
	}

	@Override
	public void commit() {
		txMgr.commit(transactions.get().pop());
	}

	@Override
	public void rollback() {
		txMgr.rollback(transactions.get().pop());
	}

	@Override
	public boolean isRollbackOnly() {
		return transactions.get().peek().isRollbackOnly();
	}

	@Override
	public void setRollbackOnly() {
		// works only for transactions opened by @Transactional annotations
		TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();
	}

	@Override
	public String getName() {
		return name;
	}

}