keith-turner commented on a change in pull request #1001: [WIP] - Issue 978
URL: https://github.com/apache/fluo/pull/1001#discussion_r163349749
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File path:
modules/core/src/main/java/org/apache/fluo/core/impl/TransactionImpl.java
##########
@@ -872,262 +847,356 @@ public int getSize() {
return size;
}
- private <V> void addCallback(CompletableFuture<V> cfuture, CommitData cd,
- OnSuccessInterface<V> onSuccessInterface) {
- cfuture.handleAsync((result, exception) -> {
- if (exception != null) {
- cd.commitObserver.failed(exception);
- return null;
- } else {
- try {
- onSuccessInterface.onSuccess(result);
- return null;
- } catch (Exception e) {
- cd.commitObserver.failed(e);
- return null;
- }
- }
- }, env.getSharedResources().getAsyncCommitExecutor());
- }
+ // TODO exception handling!!!! How?????
+ abstract class CommitStep {
+ private CommitStep nextStep;
- @Override
- public synchronized void commitAsync(AsyncCommitObserver commitCallback) {
+ // the boolean indicates if the operation was successful.
+ abstract CompletableFuture<Boolean> getMainOp(CommitData cd);
- checkIfOpen();
- status = TxStatus.COMMIT_STARTED;
- commitAttempted = true;
+ // create and run this op in the event that the main op was a failure
+ abstract CompletableFuture<Void> getFailureOp(CommitData cd);
- try {
- CommitData cd = createCommitData();
- beginCommitAsync(cd, commitCallback, null);
- } catch (Exception e) {
- e.printStackTrace();
- commitCallback.failed(e);
+ // set the next step to run if this step is successful
+ CommitStep andThen(CommitStep next) {
+ this.nextStep = next;
+ return next;
}
- }
- private void beginCommitAsync(CommitData cd, AsyncCommitObserver
commitCallback,
- RowColumn primary) {
- if (updates.size() == 0) {
- // TODO do async
- deleteWeakRow();
- commitCallback.committed();
- return;
+ CompletableFuture<Void> compose(CommitData cd) {
+ return getMainOp(cd).thenComposeAsync(successful -> {
+ if (successful) {
+ if (nextStep != null) {
+ return nextStep.compose(cd);
+ } else {
+ return CompletableFuture.completedFuture(null);
+ }
+ } else {
+ return getFailureOp(cd);
+ }
+ }, env.getSharedResources().getAsyncCommitExecutor());
}
- for (Map<Column, Bytes> cols : updates.values()) {
- stats.incrementEntriesSet(cols.size());
- }
+ }
- Bytes primRow = null;
- Column primCol = null;
+ abstract class ConditionalStep extends CommitStep {
- if (primary != null) {
- primRow = primary.getRow();
- primCol = primary.getColumn();
- if (notification != null &&
!primary.equals(notification.getRowColumn())) {
- throw new IllegalArgumentException("Primary must be notification");
- }
- } else if (notification != null) {
- primRow = notification.getRow();
- primCol = notification.getColumn();
- } else {
+ CommitData cd;
- outer: for (Entry<Bytes, Map<Column, Bytes>> entry : updates.entrySet())
{
- for (Entry<Column, Bytes> entry2 : entry.getValue().entrySet()) {
- if (!isReadLock(entry2.getValue())) {
- primRow = entry.getKey();
- primCol = entry2.getKey();
- break outer;
- }
- }
- }
+ public abstract Collection<ConditionalMutation> createMutations(CommitData
cd);
- if (primRow == null) {
- // there are only read locks, so nothing to write
- deleteWeakRow();
- commitCallback.committed();
- return;
- }
- }
+ public abstract Iterator<Result> handleUnknown(CommitData cd,
Iterator<Result> results)
+ throws Exception;
- // get a primary column
- cd.prow = primRow;
- Map<Column, Bytes> colSet = updates.get(cd.prow);
- cd.pcol = primCol;
- cd.pval = colSet.remove(primCol);
- if (colSet.size() == 0) {
- updates.remove(cd.prow);
+ public abstract boolean processResults(CommitData cd, Iterator<Result>
results)
+ throws Exception;
+
+ public AsyncConditionalWriter getACW(CommitData cd) {
+ return cd.acw;
}
- cd.commitObserver = commitCallback;
+ @Override
+ CompletableFuture<Boolean> getMainOp(CommitData cd) {
+ // TODO not sure threading is correct
+ Executor ace = env.getSharedResources().getAsyncCommitExecutor();
+ return getACW(cd).apply(createMutations(cd)).thenCompose(results -> {
+ // ugh icky that this is an iterator, forces copy to inspect.. could
refactor async CW to
+ // return collection
+ ArrayList<Result> resultsList = new ArrayList<>();
+ Iterators.addAll(resultsList, results);
+ boolean containsUknown = false;
+ for (Result result : resultsList) {
+ try {
+ containsUknown |= result.getStatus() == Status.UNKNOWN;
+ } catch (Exception e) {
Review comment:
It may make the code a little more readable to put the entire lamba in a try
catch block and drop these two nested try catch blocks. However I think its
also fine the leave the code as is.
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