ResourcelessTransactionManager.java

package org.springframework.retry;

import java.util.Stack;

import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionException;
import org.springframework.transaction.support.AbstractPlatformTransactionManager;
import org.springframework.transaction.support.DefaultTransactionStatus;
import org.springframework.transaction.support.TransactionSynchronizationManager;

@SuppressWarnings("serial")
public class ResourcelessTransactionManager extends AbstractPlatformTransactionManager {

	protected void doBegin(Object transaction, TransactionDefinition definition) throws TransactionException {
		((ResourcelessTransaction) transaction).begin();
	}

	protected void doCommit(DefaultTransactionStatus status) throws TransactionException {
		logger.debug("Committing resourceless transaction on [" + status.getTransaction() + "]");
	}

	protected Object doGetTransaction() throws TransactionException {
		Object transaction = new ResourcelessTransaction();
		Stack<Object> resources;
		if (!TransactionSynchronizationManager.hasResource(this)) {
			resources = new Stack<Object>();
			TransactionSynchronizationManager.bindResource(this, resources);
		}
		else {
			@SuppressWarnings("unchecked")
			Stack<Object> stack = (Stack<Object>) TransactionSynchronizationManager.getResource(this);
			resources = stack;
		}
		resources.push(transaction);
		return transaction;
	}

	protected void doRollback(DefaultTransactionStatus status) throws TransactionException {
		logger.debug("Rolling back resourceless transaction on [" + status.getTransaction() + "]");
	}

	protected boolean isExistingTransaction(Object transaction) throws TransactionException {
		if (TransactionSynchronizationManager.hasResource(this)) {
			@SuppressWarnings("unchecked")
			Stack<Object> stack = (Stack<Object>) TransactionSynchronizationManager.getResource(this);
			return stack.size() > 1;
		}
		return ((ResourcelessTransaction) transaction).isActive();
	}

	protected void doSetRollbackOnly(DefaultTransactionStatus status) throws TransactionException {
	}

	protected void doCleanupAfterCompletion(Object transaction) {
		@SuppressWarnings("unchecked")
		Stack<Object> list = (Stack<Object>) TransactionSynchronizationManager.getResource(this);
		Stack<Object> resources = list;
		resources.clear();
		TransactionSynchronizationManager.unbindResource(this);
		((ResourcelessTransaction) transaction).clear();
	}

	private static class ResourcelessTransaction {

		private boolean active = false;

		public boolean isActive() {
			return active;
		}

		public void begin() {
			active = true;
		}

		public void clear() {
			active = false;
		}

	}

}