runtime/org.argeo.slc.support.jcr/src/main/java/org/argeo/slc/jcr/execution/JcrExecutionModulesListener.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.jcr.execution;
  17
  18 import java.util.Arrays;
  19 import java.util.Iterator;
  20 import java.util.List;
  21
  22 import javax.jcr.Node;
  23 import javax.jcr.NodeIterator;
  24 import javax.jcr.Property;
  25 import javax.jcr.Repository;
  26 import javax.jcr.RepositoryException;
  27 import javax.jcr.Session;
  28 import javax.jcr.nodetype.NodeType;
  29
  30 import org.apache.commons.logging.Log;
  31 import org.apache.commons.logging.LogFactory;
  32 import org.argeo.jcr.JcrUtils;
  33 import org.argeo.slc.SlcException;
  34 import org.argeo.slc.core.execution.PrimitiveSpecAttribute;
  35 import org.argeo.slc.core.execution.PrimitiveValue;
  36 import org.argeo.slc.core.execution.RefSpecAttribute;
  37 import org.argeo.slc.core.execution.RefValueChoice;
  38 import org.argeo.slc.deploy.ModuleDescriptor;
  39 import org.argeo.slc.execution.ExecutionFlowDescriptor;
  40 import org.argeo.slc.execution.ExecutionModuleDescriptor;
  41 import org.argeo.slc.execution.ExecutionModulesListener;
  42 import org.argeo.slc.execution.ExecutionModulesManager;
  43 import org.argeo.slc.execution.ExecutionSpec;
  44 import org.argeo.slc.execution.ExecutionSpecAttribute;
  45 import org.argeo.slc.jcr.SlcJcrUtils;
  46 import org.argeo.slc.jcr.SlcNames;
  47 import org.argeo.slc.jcr.SlcTypes;
  48
  49 /**
  50  * Synchronizes the local execution runtime with a JCR repository. For the time
  51  * being the state is completely reset from one start to another.
  52  */
  53 public class JcrExecutionModulesListener implements ExecutionModulesListener,
  54                 SlcNames {
  55         private final static String SLC_EXECUTION_MODULES_PROPERTY = "slc.executionModules";
  56
  57         private final static Log log = LogFactory
  58                         .getLog(JcrExecutionModulesListener.class);
  59         private JcrAgent agent;
  60
  61         private ExecutionModulesManager modulesManager;
  62
  63         private Repository repository;
  64         /**
  65          * We don't use a thread bound session because many different threads will
  66          * call this critical component and we don't want to login each time. We
  67          * therefore rather protect access to this session via synchronized.
  68          */
  69         private Session session;
  70
  71         /*
  72          * LIFECYCLE
  73          */
  74         public void init() {
  75                 try {
  76                         session = repository.login();
  77                         clearAgent();
  78                         if (modulesManager != null) {
  79                                 Node agentNode = session.getNode(agent.getNodePath());
  80
  81                                 List<ModuleDescriptor> moduleDescriptors = modulesManager
  82                                                 .listModules();
  83
  84                                 // scan SLC-ExecutionModule metadata
  85                                 for (ModuleDescriptor md : moduleDescriptors) {
  86                                         if (md.getMetadata().containsKey(
  87                                                         ExecutionModuleDescriptor.SLC_EXECUTION_MODULE)) {
  88                                                 String moduleNodeName = SlcJcrUtils
  89                                                                 .getModuleNodeName(md);
  90                                                 Node moduleNode = agentNode.hasNode(moduleNodeName) ? agentNode
  91                                                                 .getNode(moduleNodeName) : agentNode
  92                                                                 .addNode(moduleNodeName);
  93                                                 moduleNode.addMixin(SlcTypes.SLC_EXECUTION_MODULE);
  94                                                 moduleNode.setProperty(SLC_NAME, md.getName());
  95                                                 moduleNode.setProperty(SLC_VERSION, md.getVersion());
  96                                                 moduleNode.setProperty(Property.JCR_TITLE,
  97                                                                 md.getTitle());
  98                                                 moduleNode.setProperty(Property.JCR_DESCRIPTION,
  99                                                                 md.getDescription());
 100                                                 moduleNode.setProperty(SLC_STARTED, md.getStarted());
 101                                         }
 102                                 }
 103
 104                                 // scan execution modules property
 105                                 String executionModules = System
 106                                                 .getProperty(SLC_EXECUTION_MODULES_PROPERTY);
 107                                 if (executionModules != null) {
 108                                         for (String executionModule : executionModules.split(",")) {
 109                                                 allModules: for (ModuleDescriptor md : moduleDescriptors) {
 110                                                         String moduleNodeName = SlcJcrUtils
 111                                                                         .getModuleNodeName(md);
 112                                                         if (md.getName().equals(executionModule)) {
 113                                                                 Node moduleNode = agentNode
 114                                                                                 .hasNode(moduleNodeName) ? agentNode
 115                                                                                 .getNode(moduleNodeName) : agentNode
 116                                                                                 .addNode(moduleNodeName);
 117                                                                 moduleNode
 118                                                                                 .addMixin(SlcTypes.SLC_EXECUTION_MODULE);
 119                                                                 moduleNode.setProperty(SLC_NAME, md.getName());
 120                                                                 moduleNode.setProperty(SLC_VERSION,
 121                                                                                 md.getVersion());
 122                                                                 moduleNode.setProperty(Property.JCR_TITLE,
 123                                                                                 md.getTitle());
 124                                                                 moduleNode.setProperty(
 125                                                                                 Property.JCR_DESCRIPTION,
 126                                                                                 md.getDescription());
 127                                                                 moduleNode.setProperty(SLC_STARTED,
 128                                                                                 md.getStarted());
 129                                                                 break allModules;
 130                                                         }
 131                                                 }
 132                                         }
 133
 134                                         // save if needed
 135                                         if (session.hasPendingChanges())
 136                                                 session.save();
 137                                 }
 138                         }
 139                 } catch (RepositoryException e) {
 140                         JcrUtils.discardQuietly(session);
 141                         JcrUtils.logoutQuietly(session);
 142                         throw new SlcException("Cannot initialize modules", e);
 143                 }
 144         }
 145
 146         public void destroy() {
 147                 clearAgent();
 148                 JcrUtils.logoutQuietly(session);
 149         }
 150
 151         protected synchronized void clearAgent() {
 152                 try {
 153                         Node agentNode = session.getNode(agent.getNodePath());
 154                         for (NodeIterator nit = agentNode.getNodes(); nit.hasNext();)
 155                                 nit.nextNode().remove();
 156                         session.save();
 157                 } catch (RepositoryException e) {
 158                         JcrUtils.discardQuietly(session);
 159                         throw new SlcException("Cannot clear agent " + agent, e);
 160                 }
 161         }
 162
 163         /*
 164          * EXECUTION MODULES LISTENER
 165          */
 166
 167         public synchronized void executionModuleAdded(
 168                         ModuleDescriptor moduleDescriptor) {
 169                 syncExecutionModule(moduleDescriptor);
 170         }
 171
 172         protected void syncExecutionModule(ModuleDescriptor moduleDescriptor) {
 173                 try {
 174                         Node agentNode = session.getNode(agent.getNodePath());
 175                         String moduleNodeName = SlcJcrUtils
 176                                         .getModuleNodeName(moduleDescriptor);
 177                         Node moduleNode = agentNode.hasNode(moduleNodeName) ? agentNode
 178                                         .getNode(moduleNodeName) : agentNode
 179                                         .addNode(moduleNodeName);
 180                         moduleNode.addMixin(SlcTypes.SLC_EXECUTION_MODULE);
 181                         moduleNode.setProperty(SLC_NAME, moduleDescriptor.getName());
 182                         moduleNode.setProperty(SLC_VERSION, moduleDescriptor.getVersion());
 183                         moduleNode.setProperty(Property.JCR_TITLE,
 184                                         moduleDescriptor.getTitle());
 185                         moduleNode.setProperty(Property.JCR_DESCRIPTION,
 186                                         moduleDescriptor.getDescription());
 187                         moduleNode.setProperty(SLC_STARTED, moduleDescriptor.getStarted());
 188                         session.save();
 189                 } catch (RepositoryException e) {
 190                         JcrUtils.discardQuietly(session);
 191                         throw new SlcException("Cannot sync module " + moduleDescriptor, e);
 192                 }
 193         }
 194
 195         public synchronized void executionModuleRemoved(
 196                         ModuleDescriptor moduleDescriptor) {
 197                 try {
 198                         String moduleName = SlcJcrUtils.getModuleNodeName(moduleDescriptor);
 199                         Node agentNode = session.getNode(agent.getNodePath());
 200                         if (agentNode.hasNode(moduleName)) {
 201                                 Node moduleNode = agentNode.getNode(moduleName);
 202                                 for (NodeIterator nit = moduleNode.getNodes(); nit.hasNext();) {
 203                                         nit.nextNode().remove();
 204                                 }
 205                                 moduleNode.setProperty(SLC_STARTED, false);
 206                         }
 207                         session.save();
 208                 } catch (RepositoryException e) {
 209                         JcrUtils.discardQuietly(session);
 210                         throw new SlcException("Cannot remove module " + moduleDescriptor,
 211                                         e);
 212                 }
 213         }
 214
 215         public synchronized void executionFlowAdded(ModuleDescriptor module,
 216                         ExecutionFlowDescriptor efd) {
 217                 try {
 218                         Node agentNode = session.getNode(agent.getNodePath());
 219                         Node moduleNode = agentNode.getNode(SlcJcrUtils
 220                                         .getModuleNodeName(module));
 221                         String relativePath = getExecutionFlowRelativePath(efd);
 222                         @SuppressWarnings("unused")
 223                         Node flowNode = null;
 224                         if (!moduleNode.hasNode(relativePath)) {
 225                                 flowNode = createExecutionFlowNode(moduleNode, relativePath,
 226                                                 efd);
 227                                 session.save();
 228                         } else {
 229                                 flowNode = moduleNode.getNode(relativePath);
 230                         }
 231
 232                         if (log.isTraceEnabled())
 233                                 log.trace("Flow " + efd + " added to JCR");
 234                 } catch (RepositoryException e) {
 235                         JcrUtils.discardQuietly(session);
 236                         throw new SlcException("Cannot add flow " + efd + " from module "
 237                                         + module, e);
 238                 }
 239
 240         }
 241
 242         protected Node createExecutionFlowNode(Node moduleNode,
 243                         String relativePath, ExecutionFlowDescriptor efd)
 244                         throws RepositoryException {
 245                 Node flowNode = null;
 246                 Iterator<String> names = Arrays.asList(relativePath.split("/"))
 247                                 .iterator();
 248                 // create intermediary paths
 249                 Node currNode = moduleNode;
 250                 while (names.hasNext()) {
 251                         String name = names.next();
 252                         if (currNode.hasNode(name))
 253                                 currNode = currNode.getNode(name);
 254                         else {
 255                                 if (names.hasNext())
 256                                         currNode = currNode.addNode(name);
 257                                 else
 258                                         flowNode = currNode.addNode(name,
 259                                                         SlcTypes.SLC_EXECUTION_FLOW);
 260                         }
 261                 }
 262
 263                 // name, description
 264                 flowNode.setProperty(SLC_NAME, efd.getName());
 265                 String[] tokens = relativePath.split("/");
 266                 String endName = tokens[tokens.length - 1];
 267                 flowNode.setProperty(Property.JCR_TITLE, endName);
 268                 if (efd.getDescription() != null
 269                                 && !efd.getDescription().trim().equals("")) {
 270                         flowNode.setProperty(Property.JCR_DESCRIPTION, efd.getDescription());
 271                 } else {
 272                         flowNode.setProperty(Property.JCR_DESCRIPTION, endName);
 273                 }
 274
 275                 // execution spec
 276                 ExecutionSpec executionSpec = efd.getExecutionSpec();
 277                 String esName = executionSpec.getName();
 278                 if (esName == null || esName.equals(ExecutionSpec.INTERNAL_NAME)
 279                                 || esName.contains("#")/* automatically generated bean name */) {
 280                         // internal spec node
 281                         mapExecutionSpec(flowNode, executionSpec);
 282                 } else {
 283                         // reference spec node
 284                         Node executionSpecsNode = moduleNode.hasNode(SLC_EXECUTION_SPECS) ? moduleNode
 285                                         .getNode(SLC_EXECUTION_SPECS) : moduleNode
 286                                         .addNode(SLC_EXECUTION_SPECS);
 287                         Node executionSpecNode = executionSpecsNode.addNode(esName,
 288                                         SlcTypes.SLC_EXECUTION_SPEC);
 289                         executionSpecNode.setProperty(SLC_NAME, esName);
 290                         executionSpecNode.setProperty(Property.JCR_TITLE, esName);
 291                         if (executionSpec.getDescription() != null
 292                                         && !executionSpec.getDescription().trim().equals(""))
 293                                 executionSpecNode.setProperty(Property.JCR_DESCRIPTION,
 294                                                 executionSpec.getDescription());
 295                         mapExecutionSpec(executionSpecNode, executionSpec);
 296                         flowNode.setProperty(SLC_SPEC, executionSpecNode);
 297                 }
 298
 299                 // values
 300                 for (String attr : efd.getValues().keySet()) {
 301                         ExecutionSpecAttribute esa = executionSpec.getAttributes()
 302                                         .get(attr);
 303                         if (esa instanceof PrimitiveSpecAttribute) {
 304                                 PrimitiveSpecAttribute psa = (PrimitiveSpecAttribute) esa;
 305                                 Node valueNode = flowNode.addNode(attr);
 306                                 valueNode.setProperty(SLC_TYPE, psa.getType());
 307                                 SlcJcrUtils.setPrimitiveAsProperty(valueNode, SLC_VALUE,
 308                                                 (PrimitiveValue) efd.getValues().get(attr));
 309                         }
 310                 }
 311
 312                 return flowNode;
 313         }
 314
 315         /**
 316          * Base can be either an execution spec node, or an execution flow node (in
 317          * case the execution spec is internal)
 318          */
 319         protected void mapExecutionSpec(Node baseNode, ExecutionSpec executionSpec)
 320                         throws RepositoryException {
 321                 for (String attrName : executionSpec.getAttributes().keySet()) {
 322                         ExecutionSpecAttribute esa = executionSpec.getAttributes().get(
 323                                         attrName);
 324                         Node attrNode = baseNode.addNode(attrName);
 325                         // booleans
 326                         attrNode.addMixin(SlcTypes.SLC_EXECUTION_SPEC_ATTRIBUTE);
 327                         attrNode.setProperty(SLC_IS_IMMUTABLE, esa.getIsImmutable());
 328                         attrNode.setProperty(SLC_IS_CONSTANT, esa.getIsConstant());
 329                         attrNode.setProperty(SLC_IS_HIDDEN, esa.getIsHidden());
 330
 331                         if (esa instanceof PrimitiveSpecAttribute) {
 332                                 attrNode.addMixin(SlcTypes.SLC_PRIMITIVE_SPEC_ATTRIBUTE);
 333                                 PrimitiveSpecAttribute psa = (PrimitiveSpecAttribute) esa;
 334                                 SlcJcrUtils.setPrimitiveAsProperty(attrNode, SLC_VALUE, psa);
 335                                 attrNode.setProperty(SLC_TYPE, psa.getType());
 336                         } else if (esa instanceof RefSpecAttribute) {
 337                                 attrNode.addMixin(SlcTypes.SLC_REF_SPEC_ATTRIBUTE);
 338                                 RefSpecAttribute rsa = (RefSpecAttribute) esa;
 339                                 attrNode.setProperty(SLC_TYPE, rsa.getTargetClassName());
 340                                 Object value = rsa.getValue();
 341                                 if (rsa.getChoices() != null) {
 342                                         Integer index = null;
 343                                         int count = 0;
 344                                         for (RefValueChoice choice : rsa.getChoices()) {
 345                                                 String name = choice.getName();
 346                                                 if (value != null && name.equals(value.toString()))
 347                                                         index = count;
 348                                                 Node choiceNode = attrNode.addNode(choice.getName());
 349                                                 choiceNode.addMixin(NodeType.MIX_TITLE);
 350                                                 choiceNode.setProperty(Property.JCR_TITLE,
 351                                                                 choice.getName());
 352                                                 if (choice.getDescription() != null
 353                                                                 && !choice.getDescription().trim().equals(""))
 354                                                         choiceNode.setProperty(Property.JCR_DESCRIPTION,
 355                                                                         choice.getDescription());
 356                                                 count++;
 357                                         }
 358
 359                                         if (index != null)
 360                                                 attrNode.setProperty(SLC_VALUE, index);
 361                                 }
 362                         }
 363                 }
 364         }
 365
 366         public synchronized void executionFlowRemoved(ModuleDescriptor module,
 367                         ExecutionFlowDescriptor executionFlow) {
 368                 try {
 369                         Node agentNode = session.getNode(agent.getNodePath());
 370                         Node moduleNode = agentNode.getNode(SlcJcrUtils
 371                                         .getModuleNodeName(module));
 372                         String relativePath = getExecutionFlowRelativePath(executionFlow);
 373                         if (moduleNode.hasNode(relativePath))
 374                                 moduleNode.getNode(relativePath).remove();
 375                         agentNode.getSession().save();
 376                 } catch (RepositoryException e) {
 377                         throw new SlcException("Cannot remove flow " + executionFlow
 378                                         + " from module " + module, e);
 379                 }
 380         }
 381
 382         /*
 383          * UTILITIES
 384          */
 385         /** @return the relative path, never starts with '/' */
 386         @SuppressWarnings("deprecation")
 387         protected String getExecutionFlowRelativePath(
 388                         ExecutionFlowDescriptor executionFlow) {
 389                 String relativePath = executionFlow.getPath() == null ? executionFlow
 390                                 .getName() : executionFlow.getPath() + '/'
 391                                 + executionFlow.getName();
 392                 // we assume that it is more than one char long
 393                 if (relativePath.charAt(0) == '/')
 394                         relativePath = relativePath.substring(1);
 395                 // FIXME quick hack to avoid duplicate '/'
 396                 relativePath = relativePath.replaceAll("//", "/");
 397                 return relativePath;
 398         }
 399
 400         /*
 401          * BEAN
 402          */
 403         public void setAgent(JcrAgent agent) {
 404                 this.agent = agent;
 405         }
 406
 407         public void setRepository(Repository repository) {
 408                 this.repository = repository;
 409         }
 410
 411         public void setModulesManager(ExecutionModulesManager modulesManager) {
 412                 this.modulesManager = modulesManager;
 413         }
 414
 415 }