davidjumani commented on code in PR #6755:
URL: https://github.com/apache/cloudstack/pull/6755#discussion_r1009029612
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plugins/shutdown/src/main/java/org/apache/cloudstack/shutdown/ShutdownManagerImpl.java:
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@@ -0,0 +1,118 @@
+package org.apache.cloudstack.shutdown;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.inject.Inject;
+
+import org.apache.cloudstack.api.command.CancelShutdownCmd;
+import org.apache.cloudstack.api.command.PrepareForShutdownCmd;
+import org.apache.cloudstack.api.command.ReadyForShutdownCmd;
+import org.apache.cloudstack.api.command.TriggerShutdownCmd;
+import org.apache.cloudstack.api.response.ReadyForShutdownResponse;
+import org.apache.cloudstack.framework.jobs.AsyncJobManager;
+import org.apache.log4j.Logger;
+
+import com.cloud.utils.component.ManagerBase;
+import com.cloud.utils.component.PluggableService;
+import com.cloud.utils.exception.CloudRuntimeException;
+
+public class ShutdownManagerImpl extends ManagerBase implements
ShutdownManager, PluggableService{
+
+ private static Logger s_logger =
Logger.getLogger(ShutdownManagerImpl.class);
+
+ @Inject
+ private AsyncJobManager _jobMgr;
+
+ private boolean shutdownTriggered = false;
+
+ @Override
+ public boolean isShutdownTriggered() {
+ return shutdownTriggered;
+ }
+
+ protected ShutdownManagerImpl() {
+ super();
+ }
+
+ @Override
+ public long countPendingJobs() {
+ return _jobMgr.countPendingNonPseudoJobs();
+ }
+
+ @Override
+ public ReadyForShutdownResponse readyForShutdown() {
+ long pendingJobCount = countPendingJobs();
+ return new ReadyForShutdownResponse(!_jobMgr.isAllowAsyncJobs(),
pendingJobCount == 0, pendingJobCount);
+ }
+
+ @Override
+ public ReadyForShutdownResponse prepareForShutdown() {
+ _jobMgr.disableAllowAsyncJobs();
+ return readyForShutdown();
+ }
+
+ @Override
+ public ReadyForShutdownResponse triggerShutdown(Boolean forced) {
+ this.shutdownTriggered = true;
+ if (forced != null && forced) {
+ System.exit(0);
+ }
+ _jobMgr.disableAllowAsyncJobs();
+ Thread shutdownTask = new ShutdownTask(this);
+ shutdownTask.start();
+ return readyForShutdown();
+ }
+
+ @Override
+ public ReadyForShutdownResponse cancelShutdown() {
+ this.shutdownTriggered = false;
+ if (_jobMgr.isAllowAsyncJobs()) {
+ throw new CloudRuntimeException("A shutdown has not been
triggered");
+ }
+
+ _jobMgr.enableAllowAsyncJobs();
+ return readyForShutdown();
+ }
+
+ @Override
+ public List<Class<?>> getCommands() {
+ final List<Class<?>> cmdList = new ArrayList<>();
+ cmdList.add(CancelShutdownCmd.class);
+ cmdList.add(PrepareForShutdownCmd.class);
+ cmdList.add(ReadyForShutdownCmd.class);
+ cmdList.add(TriggerShutdownCmd.class);
+ return cmdList;
+ }
+
+ private final class ShutdownTask extends Thread {
+
+ private ShutdownManager shutdownManager;
+
+ private ShutdownTask(final ShutdownManager shutdownManager) {
+ this.shutdownManager = shutdownManager;
+ }
+
+ @Override
+ public void run() {
+ while(true) {
+ try {
+ String msg = String.format("Checking for triggered
shutdown... shutdownTriggered [%b] AllowAsyncJobs [%b] PendingJobCount [%d]",
+ shutdownManager.isShutdownTriggered(),
_jobMgr.isAllowAsyncJobs(), shutdownManager.countPendingJobs());
+ s_logger.info(msg);
+ if (!shutdownManager.isShutdownTriggered()) {
+ return;
+ }
+ if (shutdownManager.countPendingJobs() == 0) {
+ s_logger.info("Shutting down now");
+ System.exit(0);
Review Comment:
When `System.exit()` is called, all shutdown hooks are triggered and only
when complete does the program exit
https://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#exit(int)
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