public Result invoke()

in dubbo-filter-extensions/dubbo-filter-seata/src/main/java/org/apache/dubbo/seata/SeataTransactionPropagationProviderFilter.java [45:100]
55 lines of code
15 McCabe index (conditional complexity)

    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        String rpcXid = invocation.getAttachment(RootContext.KEY_XID);
        if (rpcXid == null) {
            rpcXid = invocation.getAttachment(LOWER_KEY_XID);
        }
        String rpcBranchType = invocation.getAttachment(RootContext.KEY_BRANCH_TYPE);
        if (rpcBranchType == null) {
            rpcBranchType = invocation.getAttachment(LOWER_KEY_BRANCH_TYPE);
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("Server side xid in RpcContext[" + rpcXid + "]");
        }
        boolean bind = false;

        if (rpcXid != null) {
            RootContext.bind(rpcXid);
            if (StringUtils.equals(BranchType.TCC.name(), rpcBranchType)) {
                RootContext.bindBranchType(BranchType.TCC);
            }
            bind = true;
            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug(String.format("bind xid [%s] branchType [%s] to RootContext", rpcXid, rpcBranchType));
            }
        }
        try {
            return invoker.invoke(invocation);
        } finally {
            if (bind) {
                if (Constants.LOCAL_PROTOCOL.equals(invoker.getUrl().getProtocol())) {
                    LOGGER.info("invoke happens in same jvm, skip unbind xid");
                } else {
                    BranchType previousBranchType = RootContext.getBranchType();
                    String unbindXid = RootContext.unbind();
                    if (BranchType.TCC == previousBranchType) {
                        RootContext.unbindBranchType();
                    }
                    if (LOGGER.isDebugEnabled()) {
                        LOGGER.debug(String.format("unbind xid [%s] branchType [%s] from RootContext", unbindXid, previousBranchType));
                    }
                    if (!rpcXid.equalsIgnoreCase(unbindXid)) {
                        LOGGER.warn(String
                            .format("xid in change during RPC from %s to %s,branchType from %s to %s", rpcXid, unbindXid,
                                rpcBranchType != null ? rpcBranchType : "AT", previousBranchType));
                        if (unbindXid != null) {
                            RootContext.bind(unbindXid);
                            LOGGER.warn(String.format("bind xid [%s] back to RootContext", unbindXid));
                            if (BranchType.TCC == previousBranchType) {
                                RootContext.bindBranchType(BranchType.TCC);
                                LOGGER.warn(String.format("bind branchType [%s] back to RootContext", previousBranchType));
                            }
                        }
                    }
                }
            }
        }
    }