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147 lines
4.5 KiB
C++
147 lines
4.5 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2008, Distributed Systems Architecture Group, Universidad */
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/* Complutense de Madrid (dsa-research.org) */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#ifndef MAD_H_
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#define MAD_H_
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#include <pthread.h>
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#include <sys/types.h>
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#include <map>
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#include <string>
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#include <sstream>
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#include <unistd.h>
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using namespace std;
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/**
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* Base class to build specific middleware access drivers (MAD).
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* This class provides generic MAD functionality.
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*/
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class Mad
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{
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protected:
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/**
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* The constructor initialize the class members but DOES NOT start the
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* driver. A subsequent call to the start() method is needed.
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* @param userid user running this MAD
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* @param attrs configuration attributes for the driver
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* @param sudo the driver is started through sudo if true
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*/
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Mad(
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int userid,
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const map<string,string> &attrs,
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bool sudo):
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uid(userid),
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attributes(attrs),
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sudo_execution(sudo),
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pid(-1)
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{};
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/**
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* The destructor of the class finalizes the driver process, and all its
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* associated resources (i.e. pipes)
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*/
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virtual ~Mad();
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/**
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* Send a command to the driver
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* @param os an output string stream with the message, it must be
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* terminated with the end of line character.
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*/
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void write(
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ostringstream& os) const
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{
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string str;
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const char * cstr;
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str = os.str();
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cstr = str.c_str();
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::write(nebula_mad_pipe, cstr, str.size());
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};
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private:
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friend class MadManager;
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/**
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* Communication pipe file descriptor. Represents the MAD to nebula
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* communication stream (nebula<-mad)
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*/
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int mad_nebula_pipe;
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/**
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* Communication pipe file descriptor. Represents the nebula to MAD
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* communication stream (nebula->mad)
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*/
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int nebula_mad_pipe;
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/**
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* User running this MAD as defined in the upool DB
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*/
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int uid;
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/**
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* Mad configuration attributes (e.g. executable, attributes...). Attribute
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* names MUST be lowecase.
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*/
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map<string,string> attributes;
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/**
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* True if the mad is to be executed through sudo, with the identity of the
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* Mad owner (uid).
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*/
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bool sudo_execution;
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/**
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* Process ID of the running MAD.
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*/
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pid_t pid;
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/**
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* Starts the MAD. This function creates a new process, sets up the
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* communication pipes and sends the initialization command to the driver.
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* @return 0 on success
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*/
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int start();
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/**
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* Reloads the driver: sends the finalize command, "waits" for the
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* driver process and closes the communication pipes. Then the driver is
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* started again by calling the start() function
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* @return 0 on success
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*/
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int reload();
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/**
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* Implements the driver specific protocol, this function should trigger
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* actions on the associated manager.
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* @param message the string read from the driver
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*/
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virtual void protocol(
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string& message) = 0;
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/**
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* This function is called whenever the driver crashes. This function
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* should perform the actions needed to recover the VMs.
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*/
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virtual void recover() = 0;
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};
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#endif /*MAD_H_*/
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