eclipse/plugins/org.argeo.slc.client.ui/src/main/java/org/argeo/slc/client/ui/controllers/ProcessController.java

   1 package org.argeo.slc.client.ui.controllers;
   2
   3 import java.util.HashMap;
   4 import java.util.Map;
   5
   6 import javax.jcr.Node;
   7 import javax.jcr.NodeIterator;
   8 import javax.jcr.Property;
   9
  10 import org.apache.commons.logging.Log;
  11 import org.apache.commons.logging.LogFactory;
  12 import org.argeo.slc.SlcException;
  13 import org.argeo.slc.execution.ExecutionProcess;
  14 import org.argeo.slc.jcr.SlcJcrConstants;
  15 import org.argeo.slc.jcr.SlcJcrUtils;
  16 import org.argeo.slc.jcr.SlcNames;
  17 import org.argeo.slc.jcr.execution.JcrExecutionProcess;
  18 import org.argeo.slc.runtime.SlcAgent;
  19 import org.argeo.slc.runtime.SlcAgentFactory;
  20
  21 /**
  22  * We use a separate class (not in UI components) so that it can be a singleton
  23  * in an application context.
  24  */
  25 public class ProcessController {
  26         private final static Log log = LogFactory.getLog(ProcessController.class);
  27         private Map<String, SlcAgentFactory> agentFactories = new HashMap<String, SlcAgentFactory>();
  28
  29         public ExecutionProcess process(Node processNode) {
  30                 JcrExecutionProcess process = new JcrExecutionProcess(processNode);
  31                 try {
  32                         // we currently only deal with single agents
  33                         Node realizedFlowNode = processNode.getNode(SlcNames.SLC_FLOW);
  34                         NodeIterator nit = realizedFlowNode.getNodes();
  35                         if (nit.hasNext()) {
  36                                 // TODO find a better way to determine which agent to use
  37                                 // currently we check the agent of the first registered flow
  38                                 Node firstRealizedFlow = nit.nextNode();
  39                                 // we assume there is an nt:address
  40                                 String firstFlowPath = firstRealizedFlow
  41                                                 .getNode(SlcNames.SLC_ADDRESS)
  42                                                 .getProperty(Property.JCR_PATH).getString();
  43                                 Node flowNode = processNode.getSession().getNode(firstFlowPath);
  44                                 String agentFactoryPath = SlcJcrUtils
  45                                                 .flowAgentFactoryPath(firstFlowPath);
  46                                 if (!agentFactories.containsKey(agentFactoryPath))
  47                                         throw new SlcException("No agent factory registered under "
  48                                                         + agentFactoryPath);
  49                                 SlcAgentFactory agentFactory = agentFactories
  50                                                 .get(agentFactoryPath);
  51                                 Node agentNode = ((Node) flowNode
  52                                                 .getAncestor(SlcJcrUtils.AGENT_FACTORY_DEPTH + 1));
  53                                 String agentUuid = agentNode.getProperty(SlcNames.SLC_UUID)
  54                                                 .getString();
  55
  56                                 // process
  57                                 SlcAgent slcAgent = agentFactory.getAgent(agentUuid);
  58                                 slcAgent.process(process);
  59                         }
  60                         return process;
  61                 } catch (Exception e) {
  62                         if (!process.getStatus().equals(ExecutionProcess.ERROR))
  63                                 process.setStatus(ExecutionProcess.ERROR);
  64                         throw new SlcException("Cannot execute " + processNode, e);
  65                 }
  66         }
  67
  68         public synchronized void register(SlcAgentFactory agentFactory,
  69                         Map<String, String> properties) {
  70                 String path = properties.get(SlcJcrConstants.PROPERTY_PATH);
  71                 if (log.isDebugEnabled())
  72                         log.debug("Agent factory registered under " + path);
  73                 agentFactories.put(path, agentFactory);
  74         }
  75
  76         public synchronized void unregister(SlcAgentFactory agentFactory,
  77                         Map<String, String> properties) {
  78                 String path = properties.get(SlcJcrConstants.PROPERTY_PATH);
  79                 if (log.isDebugEnabled())
  80                         log.debug("Agent factory unregistered from " + path);
  81                 agentFactories.remove(path);
  82         }
  83 }