Examples with GetChildrenResponse org.apache.zookeeper_voltpatches.proto.GetChildrenResponse used on opensource projects

Example 1 with GetChildrenResponse

use of org.apache.zookeeper_voltpatches.proto.GetChildrenResponse in project voltdb by VoltDB.

the class ZooKeeper method getChildren.

/**
     * Return the list of the children of the node of the given path.
     * <p>
     * If the watch is non-null and the call is successful (no exception is
     * thrown), a watch will be left on the node with the given path. The watch
     * willbe triggered by a successful operation that deletes the node of the
     * given path or creates/delete a child under the node.
     * <p>
     * The list of children returned is not sorted and no guarantee is provided
     * as to its natural or lexical order.
     * <p>
     * A KeeperException with error code KeeperException.NoNode will be thrown
     * if no node with the given path exists.
     *
     * @param path
     * @param watcher
     *            explicit watcher
     * @return an unordered array of children of the node with the given path
     * @throws InterruptedException
     *             If the server transaction is interrupted.
     * @throws KeeperException
     *             If the server signals an error with a non-zero error code.
     * @throws IllegalArgumentException
     *             if an invalid path is specified
     */
public List<String> getChildren(final String path, Watcher watcher) throws KeeperException, InterruptedException {
    verbotenThreadCheck();
    final String clientPath = path;
    PathUtils.validatePath(clientPath);
    // the watch contains the un-chroot path
    WatchRegistration wcb = null;
    if (watcher != null) {
        wcb = new ChildWatchRegistration(watcher, clientPath);
    }
    final String serverPath = prependChroot(clientPath);
    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.getChildren);
    GetChildrenRequest request = new GetChildrenRequest();
    request.setPath(serverPath);
    request.setWatch(watcher != null);
    GetChildrenResponse response = new GetChildrenResponse();
    ReplyHeader r = cnxn.submitRequest(h, request, response, wcb);
    if (r.getErr() != 0) {
        throw KeeperException.create(KeeperException.Code.get(r.getErr()), clientPath);
    }
    return response.getChildren();
}

Example 2 with GetChildrenResponse

use of org.apache.zookeeper_voltpatches.proto.GetChildrenResponse in project voltdb by VoltDB.

the class GetChildrenResponse method equals.

@Override
public boolean equals(Object peer_) {
    if (!(peer_ instanceof GetChildrenResponse)) {
        return false;
    }
    if (peer_ == this) {
        return true;
    }
    GetChildrenResponse peer = (GetChildrenResponse) peer_;
    boolean ret = false;
    ret = children.equals(peer.children);
    if (!ret)
        return ret;
    return ret;
}

Example 3 with GetChildrenResponse

use of org.apache.zookeeper_voltpatches.proto.GetChildrenResponse in project voltdb by VoltDB.

the class ZooKeeper method getChildren.

/**
     * The Asynchronous version of getChildren. The request doesn't actually
     * until the asynchronous callback is called.
     *
     * @see #getChildren(String, Watcher)
     */
public void getChildren(final String path, Watcher watcher, ChildrenCallback cb, Object ctx) {
    verbotenThreadCheck();
    final String clientPath = path;
    PathUtils.validatePath(clientPath);
    // the watch contains the un-chroot path
    WatchRegistration wcb = null;
    if (watcher != null) {
        wcb = new ChildWatchRegistration(watcher, clientPath);
    }
    final String serverPath = prependChroot(clientPath);
    RequestHeader h = new RequestHeader();
    h.setType(ZooDefs.OpCode.getChildren);
    GetChildrenRequest request = new GetChildrenRequest();
    request.setPath(serverPath);
    request.setWatch(watcher != null);
    GetChildrenResponse response = new GetChildrenResponse();
    cnxn.queuePacket(h, new ReplyHeader(), request, response, cb, clientPath, serverPath, ctx, wcb);
}

Example 4 with GetChildrenResponse

use of org.apache.zookeeper_voltpatches.proto.GetChildrenResponse in project voltdb by VoltDB.

the class ZooKeeperServer method executeRequest.

private void executeRequest(Request request) {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Processing request:: " + request);
    }
    // request.addRQRec(">final");
    long traceMask = ZooTrace.CLIENT_REQUEST_TRACE_MASK;
    if (request.type == OpCode.ping) {
        traceMask = ZooTrace.SERVER_PING_TRACE_MASK;
    }
    if (LOG.isTraceEnabled()) {
        ZooTrace.logRequest(LOG, traceMask, 'E', request, "");
    }
    ProcessTxnResult rc = null;
    synchronized (outstandingChanges) {
        while (!outstandingChanges.isEmpty() && outstandingChanges.get(0).zxid <= request.zxid) {
            ChangeRecord cr = outstandingChanges.remove(0);
            if (cr.zxid < request.zxid) {
                LOG.warn("Zxid outstanding " + cr.zxid + " is less than current " + request.zxid);
            }
            if (outstandingChangesForPath.get(cr.path) == cr) {
                outstandingChangesForPath.remove(cr.path);
            }
        }
        if (request.hdr != null) {
            rc = getZKDatabase().processTxn(request.hdr, request.txn);
        }
    }
    if (request.hdr != null && request.hdr.getType() == OpCode.closeSession) {
        Factory scxn = getServerCnxnFactory();
        // we might just be playing diffs from the leader
        if (scxn != null && request.cnxn == null) {
            // calling this if we have the cnxn results in the client's
            // close session response being lost - we've already closed
            // the session/socket here before we can send the closeSession
            // in the switch block below
            scxn.closeSession(request.sessionId);
            return;
        }
    }
    if (request.cnxn == null) {
        return;
    }
    ServerCnxn cnxn = request.cnxn;
    String lastOp = "NA";
    decInProcess();
    Code err = Code.OK;
    Record rsp = null;
    boolean closeSession = false;
    try {
        if (request.hdr != null && request.hdr.getType() == OpCode.error) {
            throw KeeperException.create(KeeperException.Code.get(((ErrorTxn) request.txn).getErr()));
        }
        KeeperException ke = request.getException();
        if (ke != null) {
            throw ke;
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug(request);
        }
        switch(request.type) {
            case OpCode.ping:
                {
                    serverStats().updateLatency(request.createTime);
                    lastOp = "PING";
                    ((CnxnStats) cnxn.getStats()).updateForResponse(request.cxid, request.zxid, lastOp, request.createTime, System.currentTimeMillis());
                    cnxn.sendResponse(new ReplyHeader(-2, getZKDatabase().getDataTreeLastProcessedZxid(), 0), null, "response");
                    return;
                }
            case OpCode.createSession:
                {
                    serverStats().updateLatency(request.createTime);
                    lastOp = "SESS";
                    ((CnxnStats) cnxn.getStats()).updateForResponse(request.cxid, request.zxid, lastOp, request.createTime, System.currentTimeMillis());
                    cnxn.finishSessionInit(true);
                    return;
                }
            case OpCode.create:
                {
                    lastOp = "CREA";
                    rsp = new CreateResponse(rc.path);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.delete:
                {
                    lastOp = "DELE";
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.setData:
                {
                    lastOp = "SETD";
                    rsp = new SetDataResponse(rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.setACL:
                {
                    lastOp = "SETA";
                    rsp = new SetACLResponse(rc.stat);
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.closeSession:
                {
                    lastOp = "CLOS";
                    closeSession = true;
                    err = Code.get(rc.err);
                    break;
                }
            case OpCode.sync:
                {
                    lastOp = "SYNC";
                    SyncRequest syncRequest = new SyncRequest();
                    ZooKeeperServer.byteBuffer2Record(request.request, syncRequest);
                    rsp = new SyncResponse(syncRequest.getPath());
                    break;
                }
            case OpCode.exists:
                {
                    lastOp = "EXIS";
                    // TODO we need to figure out the security requirement for this!
                    ExistsRequest existsRequest = new ExistsRequest();
                    ZooKeeperServer.byteBuffer2Record(request.request, existsRequest);
                    String path = existsRequest.getPath();
                    if (path.indexOf('\0') != -1) {
                        throw new KeeperException.BadArgumentsException();
                    }
                    Stat stat = getZKDatabase().statNode(path, existsRequest.getWatch() ? cnxn : null);
                    rsp = new ExistsResponse(stat);
                    break;
                }
            case OpCode.getData:
                {
                    lastOp = "GETD";
                    GetDataRequest getDataRequest = new GetDataRequest();
                    ZooKeeperServer.byteBuffer2Record(request.request, getDataRequest);
                    DataNode n = getZKDatabase().getNode(getDataRequest.getPath());
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    Long aclL;
                    synchronized (n) {
                        aclL = n.acl;
                    }
                    checkACL(getZKDatabase().convertLong(aclL), ZooDefs.Perms.READ, request.authInfo);
                    Stat stat = new Stat();
                    byte[] b = getZKDatabase().getData(getDataRequest.getPath(), stat, getDataRequest.getWatch() ? cnxn : null);
                    rsp = new GetDataResponse(b, stat);
                    break;
                }
            case OpCode.setWatches:
                {
                    lastOp = "SETW";
                    SetWatches setWatches = new SetWatches();
                    // XXX We really should NOT need this!!!!
                    request.request.rewind();
                    ZooKeeperServer.byteBuffer2Record(request.request, setWatches);
                    long relativeZxid = setWatches.getRelativeZxid();
                    getZKDatabase().setWatches(relativeZxid, setWatches.getDataWatches(), setWatches.getExistWatches(), setWatches.getChildWatches(), cnxn);
                    break;
                }
            case OpCode.getACL:
                {
                    lastOp = "GETA";
                    GetACLRequest getACLRequest = new GetACLRequest();
                    ZooKeeperServer.byteBuffer2Record(request.request, getACLRequest);
                    Stat stat = new Stat();
                    List<ACL> acl = getZKDatabase().getACL(getACLRequest.getPath(), stat);
                    rsp = new GetACLResponse(acl, stat);
                    break;
                }
            case OpCode.getChildren:
                {
                    lastOp = "GETC";
                    GetChildrenRequest getChildrenRequest = new GetChildrenRequest();
                    ZooKeeperServer.byteBuffer2Record(request.request, getChildrenRequest);
                    DataNode n = getZKDatabase().getNode(getChildrenRequest.getPath());
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    Long aclG;
                    synchronized (n) {
                        aclG = n.acl;
                    }
                    checkACL(getZKDatabase().convertLong(aclG), ZooDefs.Perms.READ, request.authInfo);
                    List<String> children = getZKDatabase().getChildren(getChildrenRequest.getPath(), null, getChildrenRequest.getWatch() ? cnxn : null);
                    rsp = new GetChildrenResponse(children);
                    break;
                }
            case OpCode.getChildren2:
                {
                    lastOp = "GETC";
                    GetChildren2Request getChildren2Request = new GetChildren2Request();
                    ZooKeeperServer.byteBuffer2Record(request.request, getChildren2Request);
                    Stat stat = new Stat();
                    DataNode n = getZKDatabase().getNode(getChildren2Request.getPath());
                    if (n == null) {
                        throw new KeeperException.NoNodeException();
                    }
                    Long aclG;
                    synchronized (n) {
                        aclG = n.acl;
                    }
                    checkACL(getZKDatabase().convertLong(aclG), ZooDefs.Perms.READ, request.authInfo);
                    List<String> children = getZKDatabase().getChildren(getChildren2Request.getPath(), stat, getChildren2Request.getWatch() ? cnxn : null);
                    rsp = new GetChildren2Response(children, stat);
                    break;
                }
        }
    } catch (SessionMovedException e) {
        // session moved is a connection level error, we need to tear
        // down the connection otw ZOOKEEPER-710 might happen
        // ie client on slow follower starts to renew session, fails
        // before this completes, then tries the fast follower (leader)
        // and is successful, however the initial renew is then
        // successfully fwd/processed by the leader and as a result
        // the client and leader disagree on where the client is most
        // recently attached (and therefore invalid SESSION MOVED generated)
        cnxn.sendCloseSession();
        return;
    } catch (KeeperException e) {
        err = e.code();
    } catch (Exception e) {
        // log at error level as we are returning a marshalling
        // error to the user
        LOG.error("Failed to process " + request, e);
        StringBuilder sb = new StringBuilder();
        ByteBuffer bb = request.request;
        bb.rewind();
        while (bb.hasRemaining()) {
            sb.append(Integer.toHexString(bb.get() & 0xff));
        }
        LOG.error("Dumping request buffer: 0x" + sb.toString());
        err = Code.MARSHALLINGERROR;
    }
    ReplyHeader hdr = new ReplyHeader(request.cxid, request.zxid, err.intValue());
    serverStats().updateLatency(request.createTime);
    ((CnxnStats) cnxn.getStats()).updateForResponse(request.cxid, request.zxid, lastOp, request.createTime, System.currentTimeMillis());
    try {
        cnxn.sendResponse(hdr, rsp, "response");
        if (closeSession) {
            cnxn.sendCloseSession();
        }
    } catch (IOException e) {
        LOG.error("FIXMSG", e);
    }
}