On this day we will focus on implementing the logic for our component. By the end of the day, we expect the groups to:
As a guide, we're going to show you sample code for logging, to define exceptions, throw and catch exceptions.
The component details will be presented in the first session from ACS Workshop - Project Details page to describe the interfaces and interactions of the project's components.
The ACS components have a couple of methods associated with its lifecycle that automatically gets executed at different phases of the component initialization and deactivation.
Called after initialize to tell the component that it has to be ready to accept incoming functional calls any time
Called after the last functional call to the component has finished
The component should then orderly release resources etc.
Called when due to some error condition the component is about to be forcefully removed some unknown amount of time later (usually not very much...).
The component should make an effort to die as neatly as possible
Because of its urgency, this method will be called asynchronously to the execution of any other method of the component
Python
class <name>(...): ... def initialize(): #Assign variable values #Initialize data ... def execute(): #Retrieve components #Consider ready to receive calls (Change states if appropriate) ... def cleanUp(): #Release components #Release resources ... def aboutToAbort(): #Do any critical clean up #Continue with less critical stuff such as releasing components and other activities similar to cleanUp ... ... |
Java
import alma.acs.container.ContainerServices; import alma.acs.component.ComponentLifecycleException; public class <name> ... { ... public void initialize(ContainerServices containerServices) throws ComponentLifecycleException { super.initialize(containerServices); //Assign variable values //Initialize data ... } public void execute() { //Retrieve components //Consider ready to receive calls (Change states if appropriate) ... } public void cleanUp() { //Release components //Release resources ... } public void aboutToAbort() { //Do any critical clean up //Continue with less critical stuff such as releasing components and other activities similar to cleanUp ... } ... } |
C++
class <name> : ... { ... void initialize(); void execute(); void cleanUp(); void aboutToAbort(); ... }; |
void <name>::initialize() { //Assign variable values //Initialize data ... } void <name>::execute() { //Retrieve components //Consider ready to receive calls (Change states if appropriate) ... } void <name>::cleanUp() { //Release components //Release resources ... } void <name>::aboutToAbort() { //Do any critical clean up //Continue with less critical stuff such as releasing components and other activities similar to cleanUp ... } |
During component interaction it will be needed to request and release components. When interacting with components from other components, you need to obtain the container services references to make the request to the Manager. Here we will show how to retrieve two types of components:
Python
#By Name comp = self.getComponent("<Name>") #By Interface. Must be at least one component configured as default! comp = self.getDefaultComponent("IDL:<prefix>/<Module>/<Interface>:1.0") #Release Components self.releaseComponent(comp.name()) |
Java
//Shared import alma.<Module>.<Interface>; import alma.<Module>.<Interface>Helper; //By Name <Interface> comp = <Interface>Helper.narrow(this.m_containerServices.getComponent("<Name>")); //By Interface. Must be at least one component configured as default! <Interface> comp = <Interface>Helper.narrow(this.m_containerServices.getDefaultComponent("IDL:<prefix>/<Module>/<Interface>:1.0")); //Release Components m_containerServies.releaseComponent(comp.name()); |
C++
//By Name <Module>::<Interface>_var comp = this->getContainerServices()->getComponent<<Module>::<Interface>>("<Name>"); //By Interface. Must be at least one component configured as default! <Module>::<Interface>_var comp = this->getContainerServices()->getDefaultComponent<<Module>::<Interface>>("IDL:<prefix>/<Module>/<Interface>:1.0"); //Release Components this->getContainerServices()->releaseComponent(comp->name()); |
ACS Logging has two main benefits:
Python
logger = self.getLogger() logger.logTrace("...") logger.logDebug("...") logger.logInfo("...") logger.logWarning("...") logger.logError("...") #An example logger.info("A real log with a string '%s' and an int (%d)" % ("Log Entry", 3)) |
Java
m_logger.finer("..."); m_logger.fine("..."); m_logger.info("..."); m_logger.warning("..."); m_logger.severe("..."); #An example m_logger.info("A real log with a string '" + "Log Entry" + "' and an int (" + String.valueOf(3) + ")"); |
C++
ACS_TRACE("..."); ACS_DEBUG("..."); ACS_SHORT_LOG((LM_INFO, "...")); ACS_SHORT_LOG((LM_WARNING, "...")); ACS_SHORT_LOG((LM_ERROR, "...")); //An example ACS_SHORT_LOG((LM_INFO, "A real log with a string '%s' and an int (%d)", "Log Entry", 3)); |
Error Handling in ACS Components has 4 pieces:
Error definitions are elements in XML files with the representation for errors and completions. For instance, a simple definition present in the project:
... <ErrorCode name="AlreadyInAutomatic" shortDescription="Already in automatic mode" description="Trying to set automatic mode, failed. It has already been set"/> ... |
The errors defined in the XML files need to be declared in the IDLs to be used in component communications:
... void setMode(in boolean mode) raises(SYSTEMErr::AlreadyInAutomaticEx); ... |
Throwing exceptions is done in the servant that implements the IDL method that declared the error.
Python
import SYSTEMErrImpl ... raise SYSTEMErrImpl.AlreadyInAutomaticExImpl().getAlreadyInAutomaticEx() ... |
Java
import alma.SYSTEMErr.wrappers.AcsJAlreadyInAutomaticEx; ... throw new AcsJAlreadyInAutomaticEx("Some message...").toAlreadyInAutomaticEx(); ... |
C++
#include <SYSTEMErr.h> ... throw SYSTEMErr::AlreadyInAutomaticExImpl(__FILE__, __LINE__, "Some message...").getAlreadyInAutomaticEx(); ... |
Handling is done in the component or client that calls a component through its stub.
Python
import SYSTEMErr ... try: ... except SYSTEMErr.AlreadyInAutomaticEx as e: ... ... |
Java
import alma.SYSTEMErr.AlreadyInAutomaticEx; ... try { ... } catch (AlreadyInAutomaticEx e) { ... } ... |
C++
#include <SYSTEMErr.h> ... try { ... } catch(SYSTEMErr::AlreadyInAutomaticEx &_ex) { ... } ... |
#Sending --- Img (list of int[0-255]) to string (OctetSeq mapping) img = [2,3,12,...] octseq = bytes(bytearray(img)) #Receiving --- OctetSeq mapping to Img (list of int[0-255]) octseq = takeImage(...) b = bytearray() b.extend(octseq) img = list(b) |
#Sending img = [2,3,12,...] octseq = str(bytearray(img)) imgList = [octseq, octseq, octseq] #Receiving imgList = ... imgs = [] for octseq in imgList b = bytearray() b.extend(octseq) img = list(b) imgs.append(img) |
from TYPES import Position #Sending pos = Position(az, el) #Receiving pos = ... az = pos.az el = pos.el |
from TYPES import Target from TYPES import Position #Sending pos = Position(az, el) tar = Target(tid, pos, expTime) #Receiving tar = ... tid = tar.tid pos = tar.pos eTime = tar.expTime |
from TYPES import Target from TYPES import Position #Sending pos = Position(az, el) tar = Target(tid, pos, expTime) tList = [tar, tar, tar] #Receiving tarList = ... for tar in tarList: tid = tar.tid pos = tar.pos eTime = tar.expTime ... |
#Sending --- Img (list of int[0-255]) to string (OctetSeq mapping) img = [2,3,12,...] octseq = str(bytearray(img)) #Receiving --- OctetSeq mapping to Img (list of int[0-255]) octseq = takeImage(...) b = bytearray() b.extend(octseq) img = list(b) |
#Sending img = [2,3,12,...] octseq = str(bytearray(img)) imgList = [octseq, octseq, octseq] #Receiving imgList = ... imgs = [] for octseq in imgList b = bytearray() b.extend(octseq) img = list(b) imgs.append(img) |
from TYPES import Position #Sending pos = Position(az, el) #Receiving pos = ... az = pos.az el = pos.el |
from TYPES import Target from TYPES import Position #Sending pos = Position(az, el) tar = Target(tid, pos, expTime) #Receiving tar = ... tid = tar.tid pos = tar.pos eTime = tar.expTime |
from TYPES import Target from TYPES import Position #Sending pos = Position(az, el) tar = Target(tid, pos, expTime) tList = [tar, tar, tar] #Receiving tarList = ... for tar in tarList: tid = tar.tid pos = tar.pos eTime = tar.expTime ... |
#Send ImageType img; img.length(3); img[0] = 10; img[1] = 20; img[2] = 30; #Receive ImageType_var img = ... for(unsigned int i = 0; i < img->length(); i++) { //You should also be able to use iterators... ...(*img)[i]... } |
#Send ImageList imgList; imgList(2); ImageType img1; ... imgList[0] = img1; ImageType img2; ... imgList[1] = img1; #Receive imgList_var = ... for(unsigned int i = 0; i < imgList->length(); i++) { //You should also be able to use iterators... for(unsigned int j = 0; j < (*imgList)[i].length(); j++) { //You should also be able to use iterators... ...(*imgList)[i][j]... } |