package org.argeo.slc.detached;
+import java.util.List;
+import java.util.Vector;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.detached.admin.CloseSession;
+import org.argeo.slc.detached.admin.OpenSession;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
+import org.springframework.context.ApplicationContext;
+import org.springframework.osgi.context.BundleContextAware;
-public class DetachedExecutionServerImpl implements DetachedExecutionServer {
- private final DetachedContextImpl detachedContext;
+public class DetachedExecutionServerImpl implements DetachedExecutionServer,
+ BundleContextAware {
+ private final static Log log = LogFactory
+ .getLog(DetachedExecutionServerImpl.class);
- private BundleContext bundleContext;
- private DetachedDriver driver;
+ private final DetachedContextImpl detachedContext;
+ private final List sessions;
- private boolean active = false;
+ private int skipCount = 1;// start skipCount at 1 since the first step is
+ // always an open session
- public void setDriver(DetachedDriver driver) {
- this.driver = driver;
- }
+ private BundleContext bundleContext;
public DetachedExecutionServerImpl() {
detachedContext = new DetachedContextImpl();
+ sessions = new Vector();
}
- public DetachedStepAnswer executeStep(DetachedStepRequest request) {
+ public synchronized DetachedAnswer executeRequest(DetachedRequest request) {
+ DetachedAnswer answer = null;
try {
- DetachedStep step = null;
-
- // Find step
+ // Find action
ServiceReference[] refs = bundleContext.getAllServiceReferences(
- StaticRefProvider.class.getName(), null);
+ ApplicationContext.class.getName(), null);
+ Object obj = null;
for (int i = 0; i < refs.length; i++) {
- StaticRefProvider provider = (StaticRefProvider) bundleContext
+ ApplicationContext appContext = (ApplicationContext) bundleContext
.getService(refs[i]);
- Object obj = provider.getStaticRef(request.getStepRef());
+ try {
+ obj = appContext.getBean(request.getRef());
+ } catch (Exception e) {
+ // silent
+ if (log.isTraceEnabled())
+ log.trace("Could not find ref " + request.getRef(), e);
+ }
if (obj != null) {
- step = (DetachedStep) obj;
break;
}
}
- if (step == null)
- throw new DetachedException("Could not find step with ref "
- + request.getStepRef());
+ if (obj == null)
+ throw new DetachedException("Could not find action with ref "
+ + request.getRef());
+
+ // Execute actions
+ if (obj instanceof DetachedStep) {
+ answer = processStep((DetachedStep) obj, request);
+
+ } else if (obj instanceof DetachedAdminCommand) {
+ answer = processAdminCommand((DetachedAdminCommand) obj,
+ request);
+ }
- return step.execute(detachedContext, request);
- } catch (DetachedException e) {
- throw e;
+ if (answer == null) {
+ throw new DetachedException("Unknown action type "
+ + obj.getClass() + " for action with ref "
+ + request.getRef());
+ }
} catch (Exception e) {
- e.printStackTrace();
- throw new DetachedException(
- "Unexpected exception while executing request " + request,
- e);
+ answer = new DetachedAnswer(request);
+ answer.setStatus(DetachedAnswer.ERROR);
+ answer.setLog(e.getMessage());
}
+ getCurrentSession().getRequests().add(request);
+ getCurrentSession().getAnswers().add(answer);
+ if (log.isDebugEnabled())
+ log.debug("Processed '" + request.getRef() + "' (status="
+ + answer.getStatusAsString() + ", path="
+ + request.getPath() + ")");
+ return answer;
}
- public void init(BundleContext bundleContext) {
- this.bundleContext = bundleContext;
- Thread driverThread = new Thread(new Runnable() {
-
- public void run() {
- while (active) {
- try {
- DetachedStepRequest request = driver.receiveRequest();
- executeStep(request);
- } catch (Exception e) {
- if (e instanceof RuntimeException)
- throw (RuntimeException) e;
- else
- e.printStackTrace();
+ protected DetachedAnswer processStep(DetachedStep obj,
+ DetachedRequest request) {
+ DetachedAnswer answer;
+ if (getCurrentSession() == null)
+ throw new DetachedException("No open session.");
+
+ StringBuffer skippedLog = new StringBuffer();
+ boolean execute = true;
+ if (getPreviousSession() != null && !getPreviousSession().isClosed()) {
+ if (getCurrentSession().getDoItAgainPolicy().equals(
+ DetachedSession.SKIP_UNTIL_ERROR)) {
+ // Skip execution of already successful steps
+ if (getPreviousSession().getAnswers().size() > skipCount) {
+ DetachedAnswer previousAnswer = (DetachedAnswer) getPreviousSession()
+ .getAnswers().get(skipCount);
+ DetachedRequest previousRequest = (DetachedRequest) getPreviousSession()
+ .getRequests().get(skipCount);
+ // Check paths
+ if (!previousRequest.getPath().equals(request.getPath())) {
+ String msg = "New request is not consistent with previous path. previousPath="
+ + previousRequest.getPath()
+ + ", newPath="
+ + request.getPath() + "\n";
+ skippedLog.append(msg);
+ log.warn(msg);
}
+
+ if (previousAnswer.getStatus() != DetachedAnswer.ERROR) {
+ execute = false;
+ String msg = "Skipped path " + request.getPath()
+ + " (skipCount=" + skipCount + ")";
+ skippedLog.append(msg);
+ log.info(msg);
+ skipCount++;
+ } else {
+ log
+ .info("Path "
+ + request.getPath()
+ + " was previously in error, executing it again."
+ + " (skipCount=" + skipCount
+ + "). Reset skip count to 1");
+ skipCount = 1;
+ }
+ } else {
+ // went further as skip count, doing nothing.
}
+ }
+ }
+ if (execute) {
+ DetachedStep step = (DetachedStep) obj;
+ answer = step.execute(detachedContext, request);
+ } else {
+ answer = new DetachedAnswer(request);
+ answer.setStatus(DetachedAnswer.SKIPPED);
+ answer.setLog(skippedLog.toString());
+ }
+ return answer;
+ }
+
+ protected DetachedAnswer processAdminCommand(DetachedAdminCommand obj,
+ DetachedRequest request) {
+ DetachedAnswer answer;
+ if (obj instanceof OpenSession) {
+ if (getCurrentSession() != null)
+ throw new DetachedException(
+ "There is already an open session #"
+ + getCurrentSession().getUuid());
+ sessions.add(((OpenSession) obj).execute(request, bundleContext));
+ answer = new DetachedAnswer(request, "Session #"
+ + getCurrentSession().getUuid() + " open.");
+ } else if (obj instanceof CloseSession) {
+ if (getCurrentSession() == null)
+ throw new DetachedException("There is no open session to close");
+ answer = new DetachedAnswer(request, "Session #"
+ + getCurrentSession().getUuid() + " closed.");
+ answer.setStatus(DetachedAnswer.CLOSED_SESSION);
+ } else {
+ answer = null;
+ }
+ return answer;
+ }
+
+ protected final DetachedSession getCurrentSession() {
+ if (sessions.size() == 0) {
+ return null;
+ } else {
+ DetachedSession session = (DetachedSession) sessions.get(sessions
+ .size() - 1);
+ List answers = session.getAnswers();
+ if (answers.size() > 0) {
+ DetachedAnswer lastAnswer = (DetachedAnswer) answers
+ .get(answers.size() - 1);
+ if (lastAnswer.getStatus() == DetachedAnswer.ERROR
+ || lastAnswer.getStatus() == DetachedAnswer.CLOSED_SESSION)
+ return null;
}
- }, "driverThread");
+ return session;
+ }
+ }
- active = true;
+ protected final DetachedSession getPreviousSession() {
+ if (sessions.size() < 2)
+ return null;
+ else
+ return (DetachedSession) sessions.get(sessions.size() - 2);
+ }
- driverThread.start();
+ public void setBundleContext(BundleContext bundleContext) {
+ this.bundleContext = bundleContext;
}
}
projects / gpl / argeo-slc.git / blobdiff