Examples of com.cloud.agent.transport.Request

com.cloud.agent.transport.Request
Request is a simple wrapper around command and answer to add sequencing, versioning, and flags. Note that the version here represents the changes in the over the wire protocol. For example, if we decide to not use Gson. It does not version the changes in the actual commands. That's expected to be done by adding new classes to the command and answer list. A request looks as follows: 1. Version - 1 byte; 2. Flags - 3 bytes; 3. Sequence - 8 bytes; 4. Length - 4 bytes; 5. ManagementServerId - 8 bytes; 6. AgentId - 8 bytes; 7. Data Package.

        final AgentAttache agent = getAttache(hostId);
        if (agent == null || agent.isClosed()) {
            throw new AgentUnavailableException("agent not logged into this management server", hostId);
        }


        Request req = new Request(hostId, _nodeId, cmds, commands.stopOnError(), true);
        req.setSequence(agent.getNextSequence());
        Answer[] answers = agent.send(req, timeout);
        notifyAnswersToMonitors(hostId, req.getSequence(), answers);
        commands.setAnswers(answers);
        return answers;
    }

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        assert cmds.length > 0 : "Why are you sending zero length commands?";
        if (cmds.length == 0) {
          throw new AgentUnavailableException("Empty command set for agent " + agent.getId(), agent.getId());
        }
        Request req = new Request(hostId, _nodeId, cmds, commands.stopOnError(), true);
        req.setSequence(agent.getNextSequence());
        agent.send(req, listener);
        return req.getSequence();
    }

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        s_logger.info("Stopping the agent: Reason = " + reason + (detail != null ? ": Detail = " + detail : ""));
        if (_connection != null) {
            final ShutdownCommand cmd = new ShutdownCommand(reason, detail);
            try {
                if (_link != null) {
                    Request req = new Request((_id != null ? _id : -1), -1, cmd, false);
                    _link.send(req.toBytes());
                }
            } catch (final ClosedChannelException e) {
                s_logger.warn("Unable to send: " + cmd.toString());
            } catch (Exception e) {
                s_logger.warn("Unable to send: " + cmd.toString() + " due to exception: ", e);

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        for (int i = 0; i < startup.length; i++) {
            setupStartupCommand(startup[i]);
            commands[i] = startup[i];
        }


        final Request request = new Request(_id != null ? _id : -1, -1, commands, false, false);
        request.setSequence(getNextSequence());


        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Sending Startup: " + request.toString());
        }
        synchronized (this) {
            _startup = new StartupTask(link);
            _timer.schedule(_startup, _startupWait);
        }
        try {
            link.send(request.toBytes());
        } catch (final ClosedChannelException e) {
            s_logger.warn("Unable to send reques: " + request.toString());
        }
    }

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                reconnect(link);
                return;
            }


            final PingCommand ping = _resource.getCurrentStatus(getId());
            final Request request = new Request(_id, -1, ping, false);
            request.setSequence(getNextSequence());
            if (s_logger.isDebugEnabled()) {
                s_logger.debug("Sending ping: " + request.toString());
            }


            try {
                task.getLink().send(request.toBytes());
                //if i can send pingcommand out, means the link is ok
                setLastPingResponseTime();
            } catch (final ClosedChannelException e) {
                s_logger.warn("Unable to send request: " + request.toString());
            }


        } else if (obj instanceof Request) {
            final Request req = (Request)obj;
            final Command command = req.getCommand();
            Answer answer = null;
            _inProgress.incrementAndGet();
            try {
                answer = _resource.executeRequest(command);
            } finally {

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        }
    }


    @Override
    public AgentControlAnswer sendRequest(AgentControlCommand cmd, int timeoutInMilliseconds) throws AgentControlChannelException {
        Request request = new Request(this.getId(), -1, new Command[] {cmd}, true, false);
        request.setSequence(getNextSequence());


        AgentControlListener listener = new AgentControlListener(request);


        registerControlListener(listener);
        try {

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        }
    }


    @Override
    public void postRequest(AgentControlCommand cmd) throws AgentControlChannelException {
        Request request = new Request(this.getId(), -1, new Command[] {cmd}, true, false);
        request.setSequence(getNextSequence());
        postRequest(request);
    }

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            super(type, link, req);
        }


        @Override
        protected void doTask(Task task) throws Exception {
            Request req = (Request)this.get();
            if (!(req instanceof Response)) {
                processRequest(req, task.getLink());
            }
        }

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            if (task.getType() == Task.Type.CONNECT) {
                _shell.getBackoffAlgorithm().reset();
                setLink(task.getLink());
                sendStartup(task.getLink());
            } else if (task.getType() == Task.Type.DATA) {
                Request request;
                try {
                    request = Request.parse(task.getData());
                    if (request instanceof Response) {
                        //It's for pinganswer etc, should be processed immediately.
                        processResponse((Response)request, task.getLink());

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        final AgentAttache agent = getAttache(hostId);
        if (agent == null || agent.isClosed()) {
            throw new AgentUnavailableException("agent not logged into this management server", hostId);
        }


        Request req = new Request(hostId, _nodeId, cmds, commands.stopOnError(), true);
        req.setSequence(agent.getNextSequence());
        Answer[] answers = agent.send(req, timeout);
        notifyAnswersToMonitors(hostId, req.getSequence(), answers);
        commands.setAnswers(answers);
        return answers;
    }

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