int prepare()

in geronimo-transaction/src/main/java/org/apache/geronimo/transaction/manager/TransactionImpl.java [343:387]
39 lines of code
7 McCabe index (conditional complexity)

    int prepare() throws SystemException, RollbackException {
        beforePrepare();
        int result = XAResource.XA_RDONLY;
        try {
            LinkedList rms;
            synchronized (this) {
                if (status == Status.STATUS_ACTIVE) {
                    if (resourceManagers.size() == 0) {
                        // nothing to commit
                        status = Status.STATUS_COMMITTED;
                        return result;
                    } else {
                        // start prepare part of two-phase
                        status = Status.STATUS_PREPARING;
                    }
                }
                // resourceManagers is now immutable
                rms = resourceManagers;
            }

            boolean willCommit = internalPrepare();

            // notify the RMs
            if (willCommit) {
                if (!rms.isEmpty()) {
                    result = XAResource.XA_OK;
                }
            } else {
                try {
                    rollbackResources(rms, false);
                } catch (HeuristicMixedException e) {
                    throw (SystemException)new SystemException("Unable to commit and heuristic exception during rollback").initCause(e);
                }
                throw new RollbackException("Unable to commit");
            }
        } finally {
            if (result == XAResource.XA_RDONLY) {
                afterCompletion();
                synchronized (this) {
                    status = Status.STATUS_NO_TRANSACTION;
                }
            }
        }
        return result;
    }