s1monw commented on a change in pull request #1925:
URL: https://github.com/apache/lucene-solr/pull/1925#discussion_r495778992
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File path:
lucene/core/src/java/org/apache/lucene/index/DocumentsWriterPerThread.java
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@@ -593,9 +568,61 @@ void unlock() {
}
/**
- * Returns <code>true</code> iff this DWPT has been flushed
+ * Returns the DWPTs current state.
*/
- boolean hasFlushed() {
- return hasFlushed.get() == Boolean.TRUE;
+ State getState() {
+ return state;
}
+
+ /**
+ * Transitions the DWPT to the given state of fails if the transition is
invalid.
+ * @throws IllegalStateException if the given state can not be transitioned
to.
+ */
+ synchronized void transitionTo(State state) {
+ if (state.canTransitionFrom(this.state) == false) {
+ throw new IllegalStateException("Can't transition from " + this.state +
" to " + state);
+ }
+ assert state.mustHoldLock == false || isHeldByCurrentThread() : "illegal
state: " + state + " lock is held: " + isHeldByCurrentThread();
+ this.state = state;
+ }
+
+ /**
+ * Internal DWPT State.
+ */
+ enum State {
+ /**
+ * Default states when a DWPT is initialized and ready to index documents.
+ */
+ ACTIVE(null, true),
+ /**
+ * The DWPT can still index documents but should be moved to FLUSHING
state as soon as possible.
+ * Transitions to this state can be done concurrently while another thread
is actively indexing into this DWPT.
+ */
+ FLUSH_PENDING(ACTIVE, false),
+ /**
+ * The DWPT should not receive any further documents and is current
flushing or queued up for flushing.
+ */
+ FLUSHING(FLUSH_PENDING, true),
+ /**
+ * The DWPT has been flushed and is ready to be garbage collected.
+ */
+ FLUSHED(FLUSHING, false);
+
+ private final State previousState;
+ final boolean mustHoldLock; // only for asserts
+
+ State(State previousState, boolean mustHoldLock) {
Review comment:
I gotta solve the halting problem first many, I am on it.
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