Java Xid類代碼示例

import javax.transaction.xa.Xid; //導入依賴的package包/類
public void end(Xid xid, int flags) throws XAException {

        validateXid(xid);

        if (state != XA_STATE_STARTED) {
            throw new XAException("Invalid XAResource state");
        }

        try {
            connection.setAutoCommit(originalAutoCommitMode);    // real/phys.
        } catch (SQLException se) {
            throw new XAException(se.getMessage());
        }

        state = XA_STATE_ENDED;
    }
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
@Test
public void testLRC() throws Exception {
    TransactionManager tm = createTm();

    assertFalse(tm.isLastResourceCommitSupported());

    tm.begin();
    tm.getTransaction().enlistResource(xares1);
    tm.getTransaction().enlistResource(xares2);
    tm.getTransaction().commit();

    verify(xares1).start(any(Xid.class), anyInt());
    verify(xares2).start(any(Xid.class), anyInt());
    verify(xares1).prepare(any(Xid.class));
    verify(xares2).prepare(any(Xid.class));
    verify(xares1).commit(any(Xid.class), anyBoolean());
    verify(xares2).commit(any(Xid.class), anyBoolean());
    verify(xares1).end(any(Xid.class), anyInt());
    verify(xares2).end(any(Xid.class), anyInt());
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
private void testXARecover(CloudSpannerXAConnection xaConnection) throws SQLException, XAException
{
	log.info("Started XA recover transaction test");
	testXATransaction(xaConnection, CommitMode.None);
	Xid[] xids = xaConnection.recover(XAResource.TMSTARTRSCAN);
	Assert.assertEquals(1, xids.length);
	xaConnection.commit(xids[0], false);
	boolean found = false;
	try (ResultSet rs = xaConnection.getConnection().createStatement()
			.executeQuery("select * from test where id=1000000"))
	{
		if (rs.next())
			found = true;
	}
	Assert.assertTrue(found);
	log.info("Finished XA recover transaction test");
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 *
 * @throws XAException if the given Xid is the not the Xid of the current
 *   transaction for this XAResource object.
 * @param xid Xid
 */
private void validateXid(Xid xid) throws XAException {

    if (xid == null) {
        throw new XAException("Null Xid");
    }

    if (this.xid == null) {
        throw new XAException(
            "There is no live transaction for this XAResource");
    }

    if (!xid.equals(this.xid)) {
        throw new XAException(
            "Given Xid is not that associated with this XAResource object");
    }
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
@Override
public void start(Xid xid, int flags) throws XAException {
    if ( currentXid == null ) {
        if ( flags != TMNOFLAGS ) {
            throw new XAException( "Starting resource with wrong flags" );
        }
        try {
            connection.transactionStart();
        } catch ( Exception t ) {
            throw new XAException( "Error trying to start local transaction: " + t.getMessage() );
        }
        currentXid = xid;
    } else {
        if ( flags != TMJOIN && flags != TMRESUME ) {
            throw new XAException( XAException.XAER_DUPID );
        }
    }
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * The XAResource API spec indicates implies that this is only for 2-phase
 * transactions. I guess that one-phase transactions need to call rollback()
 * to abort. I think we want this JDBCXAResource instance to be
 * garbage-collectable after (a) this method is called, and (b) the tx
 * manager releases its handle to it.
 *
 * @see javax.transaction.xa.XAResource#forget(Xid)
 * @param xid Xid
 * @throws XAException
 */
public void forget(Xid xid) throws XAException {

    /**
     * Should this method not attempt to clean up the aborted
     * transaction by rolling back or something?  Maybe the
     * tx manager will already have called rollback() if
     * it were necessary?
     */
    validateXid(xid);

    if (state != XA_STATE_PREPARED) {
        throw new XAException(
            "Attempted to forget a XAResource that "
            + "is not in a heuristically completed state");
    }

    dispose();

    state = XA_STATE_INITIAL;
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * @throws XAException if the given Xid is the not the Xid of the
 *                     current transaction for this XAResource object.
 */
private void validateXid(Xid xid) throws XAException {

    if (xid == null) {
        throw new XAException("Null Xid");
    }

    if (this.xid == null) {
        throw new XAException(
            "There is no live transaction for this XAResource");
    }

    if (!xid.equals(this.xid)) {
        throw new XAException(
            "Given Xid is not that associated with this XAResource object");
    }
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * Per the JDBC 3.0 spec, this commits the transaction for the
 * specified Xid, not necessarily for the transaction associated
 * with this XAResource object.
 */
public void commit(Xid xid, boolean onePhase) throws XAException {

    // Comment out following debug statement before public release:
    System.err.println("Performing a " + (onePhase ? "1-phase"
                                                   : "2-phase") + " commit on "
                                                   + xid);

    JDBCXAResource resource = xaDataSource.getResource(xid);

    if (resource == null) {
        throw new XAException("The XADataSource has no such Xid:  " + xid);
    }

    resource.commitThis(onePhase);
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * The XAResource API spec indicates implies that this is only for
 * 2-phase transactions.
 * I guess that one-phase transactions need to call rollback() to abort.
 *
 * I think we want this JDBCXAResource instance to be garbage-collectable
 * after (a) this method is called, and (b) the tx manager releases its
 * handle to it.
 *
 * @see javax.transaction.xa.XAResource#forget(Xid)
 */
public void forget(Xid xid) throws XAException {

    /**
     * Should this method not attempt to clean up the aborted
     * transaction by rolling back or something?  Maybe the
     * tx manager will already have called rollback() if
     * it were necessasry?
     */
    validateXid(xid);

    if (state != XA_STATE_PREPARED) {
        throw new XAException(
            "Attempted to forget a XAResource that "
            + "is not in a heuristically completed state");
    }

    dispose();

    state = XA_STATE_INITIAL;
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * Retrieves a randomly generated JDBCXID.
 *
 * The newly generated object is based on the local IP address, the given
 * <tt>threadId</tt> and a randomly generated number using the current time
 * in milliseconds as the random seed.
 *
 * Note that java.util.Random is used, not java.security.SecureRandom.
 *
 * @param threadId can be a real thread id or just some convenient
 *        tracking value.
 *
 * @return a randomly generated JDBCXID
 */
public static Xid getUniqueXid(final int threadId) {
    final Random random = new Random(System.currentTimeMillis());
    //
    int txnSequenceNumberValue = nextTxnSequenceNumber();
    int threadIdValue = threadId;
    int randomValue = random.nextInt();
    //
    byte[] globalTransactionId = new byte[MAXGTRIDSIZE];
    byte[] branchQualifier = new byte[MAXBQUALSIZE];
    byte[] localIp = getLocalIp();

    System.arraycopy(localIp, 0, globalTransactionId, 0, 4);
    System.arraycopy(localIp, 0, branchQualifier, 0, 4);

    // Bytes 4 -> 7 - unique transaction id.
    // Bytes 8 ->11 - thread id.
    // Bytes 12->15 - random.
    for (int i = 0; i <= 3; i++) {
        globalTransactionId[i + 4] = (byte) (txnSequenceNumberValue % 0x100);
        branchQualifier[i + 4] = (byte) (txnSequenceNumberValue % 0x100);
        txnSequenceNumberValue >>= 8;
        globalTransactionId[i + 8] = (byte) (threadIdValue % 0x100);
        branchQualifier[i + 8] = (byte) (threadIdValue % 0x100);
        threadIdValue >>= 8;
        globalTransactionId[i + 12] = (byte) (randomValue % 0x100);
        branchQualifier[i + 12] = (byte) (randomValue % 0x100);
        randomValue >>= 8;
    }

    return new JDBCXID(UXID_FORMAT_ID, globalTransactionId, branchQualifier);
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
private synchronized void switchToXid(Xid xid) throws XAException {
    if (xid == null) {
        throw new XAException();
    }

    try {
        if (!xid.equals(this.currentXid)) {
            XAConnection toSwitchTo = findConnectionForXid(this.underlyingConnection, xid);
            this.currentXAConnection = toSwitchTo;
            this.currentXid = xid;
            this.currentXAResource = toSwitchTo.getXAResource();
        }
    } catch (SQLException sqlEx) {
        throw new XAException();
    }
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * Tests fix for BUG#69506 - XAER_DUPID error code is not returned when a duplicate XID is offered in Java.
 * 
 * @throws Exception
 *             if the test fails.
 */
public void testBug69506() throws Exception {
    MysqlXADataSource dataSource = new MysqlXADataSource();

    dataSource.setUrl(dbUrl);

    XAConnection testXAConn1 = dataSource.getXAConnection();
    XAConnection testXAConn2 = dataSource.getXAConnection();

    Xid duplicateXID = new MysqlXid("1".getBytes(), "1".getBytes(), 1);

    testXAConn1.getXAResource().start(duplicateXID, 0);

    try {
        testXAConn2.getXAResource().start(duplicateXID, 0);
        fail("XAException was expected.");
    } catch (XAException e) {
        assertEquals("Wrong error code retured for duplicated XID.", XAException.XAER_DUPID, e.errorCode);
    }
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * Starts work on behalf of a transaction branch specified in xid.
 * 
 * If TMJOIN is specified, the start applies to joining a transaction
 * previously seen by the resource manager.
 * 
 * If TMRESUME is specified, the start applies to resuming a suspended
 * transaction specified in the parameter xid.
 * 
 * If neither TMJOIN nor TMRESUME is specified and the transaction specified
 * by xid has previously been seen by the resource manager, the resource
 * manager throws the XAException exception with XAER_DUPID error code.
 * 
 * @parameter xid A global transaction identifier to be associated with the
 *            resource.
 * 
 * @parameter flags One of TMNOFLAGS, TMJOIN, or TMRESUME.
 * 
 * @throws XAException
 *             An error has occurred. Possible exceptions are XA_RB*,
 *             XAER_RMERR, XAER_RMFAIL, XAER_DUPID, XAER_OUTSIDE, XAER_NOTA,
 *             XAER_INVAL, or XAER_PROTO.
 */
public void start(Xid xid, int flags) throws XAException {
    StringBuilder commandBuf = new StringBuilder(MAX_COMMAND_LENGTH);
    commandBuf.append("XA START ");
    appendXid(commandBuf, xid);

    switch (flags) {
        case TMJOIN:
            commandBuf.append(" JOIN");
            break;
        case TMRESUME:
            commandBuf.append(" RESUME");
            break;
        case TMNOFLAGS:
            // no-op
            break;
        default:
            throw new XAException(XAException.XAER_INVAL);
    }

    dispatchCommand(commandBuf.toString());

    this.underlyingConnection.setInGlobalTx(true);
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
private static void appendXid(StringBuilder builder, Xid xid) {
    byte[] gtrid = xid.getGlobalTransactionId();
    byte[] btrid = xid.getBranchQualifier();

    if (gtrid != null) {
        StringUtils.appendAsHex(builder, gtrid);
    }

    builder.append(',');
    if (btrid != null) {
        StringUtils.appendAsHex(builder, btrid);
    }

    builder.append(',');
    StringUtils.appendAsHex(builder, xid.getFormatId());
}
 

import javax.transaction.xa.Xid; //導入依賴的package包/類
/**
 * @param s
 *            The string to convert
 * @return recovered xid, or null if s does not represent a valid xid
 *         encoded by the driver.
 */
public static Xid stringToXid(String s)
{
	RecoveredXid xid = new RecoveredXid();

	int a = s.indexOf("_");
	int b = s.lastIndexOf("_");

	if (a == b)
	{
		// this also catches the case a == b == -1.
		return null;
	}

	try
	{
		xid.formatId = Integer.parseInt(s.substring(0, a));
		xid.globalTransactionId = Base64.decode(s.substring(a + 1, b));
		xid.branchQualifier = Base64.decode(s.substring(b + 1));

		if (xid.globalTransactionId == null || xid.branchQualifier == null)
		{
			return null;
		}
	}
	catch (Exception ex)
	{
		return null; // Doesn't seem to be an xid generated by this driver.
	}

	return xid;
}