nandakumar131 commented on a change in pull request #558: HDDS-1217. Refactor
ChillMode rules and chillmode manager.
URL: https://github.com/apache/hadoop/pull/558#discussion_r266346477
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/chillmode/ChillModeExitRule.java
##########
@@ -17,16 +17,87 @@
*/
package org.apache.hadoop.hdds.scm.chillmode;
+import org.apache.hadoop.hdds.server.events.EventHandler;
+import org.apache.hadoop.hdds.server.events.EventPublisher;
+
+
/**
- * Interface for defining chill mode exit rules.
+ * Abstract class for ChillModeExitRules. When a new rule is added, the new
+ * rule should extend this abstract class.
+ *
+ * Each rule Should do:
+ * 1. Should add a handler for the event it is looking for during the
+ * initialization of the rule.
+ * 2. Add the rule in ScmChillModeManager to list of the rules.
+ *
*
* @param <T>
*/
-public interface ChillModeExitRule<T> {
+public abstract class ChillModeExitRule<T> implements EventHandler<T> {
+
+ private final SCMChillModeManager chillModeManager;
+ private final String ruleName;
+
+ public ChillModeExitRule(SCMChillModeManager chillModeManager,
+ String ruleName) {
+ this.chillModeManager = chillModeManager;
+ this.ruleName = ruleName;
+ }
+
+ /**
+ * Return's the name of this ChillModeExit Rule.
+ * @return ruleName
+ */
+ public String getRuleName() {
+ return ruleName;
+ }
+
+
+ /**
+ * Validate's this rule. If this rule condition is met, returns true, else
+ * returns false.
+ * @return boolean
+ */
+ public abstract boolean validate();
+
+ /**
+ * Actual processing logic for this rule.
+ * @param report
+ */
+ public abstract void process(T report);
+
+ /**
+ * Cleanup action's need to be done, once this rule is satisfied.
+ */
+ public abstract void cleanup();
+
+ @Override
+ public final void onMessage(T report, EventPublisher publisher) {
+
+ // TODO: when we have remove handlers, we can remove getInChillmode check
+
+ if (chillModeManager.getInChillMode()) {
+ if (validate()) {
+ cleanup();
+ chillModeManager.validateChillModeExitRules(ruleName, publisher);
+ return;
+ }
+
+ process(report);
- boolean validate();
+ if (validate()) {
+ cleanup();
+ chillModeManager.validateChillModeExitRules(ruleName, publisher);
+ }
+ }
+ }
- void process(T report);
+ /**
+ * Return SCMChillModeManager.
+ * @return SCMChillModeManager
+ */
+ public SCMChillModeManager getChillModeManager() {
+ return chillModeManager;
+ }
Review comment:
We can replace this with
```
protected boolean scmInChillMode() {
return chillModeManager.getInChillMode();
}
```
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