Skip to content

Commit

Permalink
Make BasicPullResponseHandler support emitting signals in and out lock
Browse files Browse the repository at this point in the history 
This update adds configuration param to `BasicPullResponseHandler` to emit signals to `recordConsumer` and `summaryConsumer` either in or out of lock.
  • Loading branch information
@injectives
injectives committed May 27, 2022
1 parent da726e1 commit 3495ef0
Show file tree
Hide file tree
Showing 2 changed files with 90 additions and 56 deletions.
2 changes: 1 addition & 1 deletion driver/src/main/java/org/neo4j/driver/internal/handlers/pulln/AutoPullResponseHandler.java
View file
Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,7 @@ public AutoPullResponseHandler(
MetadataExtractor metadataExtractor,
PullResponseCompletionListener completionListener,
long fetchSize) {
super(query, runResponseHandler, connection, metadataExtractor, completionListener);
super(query, runResponseHandler, connection, metadataExtractor, completionListener, true);
this.fetchSize = fetchSize;

// For pull everything ensure conditions for disabling auto pull are never met
Expand Down
144 changes: 89 additions & 55 deletions driver/src/main/java/org/neo4j/driver/internal/handlers/pulln/BasicPullResponseHandler.java
View file
Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ public class BasicPullResponseHandler implements PullResponseHandler {
protected final MetadataExtractor metadataExtractor;
protected final Connection connection;
private final PullResponseCompletionListener completionListener;
private final boolean syncSignals;

private State state;
private long toRequest;
Expand All @@ -60,31 +61,105 @@ public BasicPullResponseHandler(
Connection connection,
MetadataExtractor metadataExtractor,
PullResponseCompletionListener completionListener) {
this(query, runResponseHandler, connection, metadataExtractor, completionListener, false);
}

public BasicPullResponseHandler(
Query query,
RunResponseHandler runResponseHandler,
Connection connection,
MetadataExtractor metadataExtractor,
PullResponseCompletionListener completionListener,
boolean syncSignals) {
this.query = requireNonNull(query);
this.runResponseHandler = requireNonNull(runResponseHandler);
this.metadataExtractor = requireNonNull(metadataExtractor);
this.connection = requireNonNull(connection);
this.completionListener = requireNonNull(completionListener);
this.syncSignals = syncSignals;

this.state = State.READY_STATE;
}

@Override
public synchronized void onSuccess(Map<String, Value> metadata) {
assertRecordAndSummaryConsumerInstalled();
state.onSuccess(this, metadata);
public void onSuccess(Map<String, Value> metadata) {
State newState;
BiConsumer<Record, Throwable> recordConsumer = null;
BiConsumer<ResultSummary, Throwable> summaryConsumer = null;
ResultSummary summary = null;
Neo4jException exception = null;
synchronized (this) {
assertRecordAndSummaryConsumerInstalled();
state.onSuccess(this, metadata);
newState = state;
if (newState == State.SUCCEEDED_STATE) {
completionListener.afterSuccess(metadata);
try {
summary = extractResultSummary(metadata);
} catch (Neo4jException e) {
summary = extractResultSummary(emptyMap());
exception = e;
}
recordConsumer = this.recordConsumer;
summaryConsumer = this.summaryConsumer;
if (syncSignals) {
complete(summaryConsumer, recordConsumer, summary, exception);
}
dispose();
} else if (newState == State.READY_STATE) {
if (toRequest > 0 || toRequest == UNLIMITED_FETCH_SIZE) {
request(toRequest);
toRequest = 0;
}
// summary consumer use (null, null) to identify done handling of success with has_more
this.summaryConsumer.accept(null, null);
}
}
if (!syncSignals && newState == State.SUCCEEDED_STATE) {
complete(summaryConsumer, recordConsumer, summary, exception);
}
}

@Override
public synchronized void onFailure(Throwable error) {
assertRecordAndSummaryConsumerInstalled();
state.onFailure(this, error);
public void onFailure(Throwable error) {
BiConsumer<Record, Throwable> recordConsumer;
BiConsumer<ResultSummary, Throwable> summaryConsumer;
ResultSummary summary;
synchronized (this) {
assertRecordAndSummaryConsumerInstalled();
state.onFailure(this, error);
completionListener.afterFailure(error);
summary = extractResultSummary(emptyMap());
recordConsumer = this.recordConsumer;
summaryConsumer = this.summaryConsumer;
if (syncSignals) {
complete(summaryConsumer, recordConsumer, summary, error);
}
dispose();
}
if (!syncSignals) {
complete(summaryConsumer, recordConsumer, summary, error);
}
}

@Override
public synchronized void onRecord(Value[] fields) {
assertRecordAndSummaryConsumerInstalled();
state.onRecord(this, fields);
public void onRecord(Value[] fields) {
State newState;
Record record = null;
synchronized (this) {
assertRecordAndSummaryConsumerInstalled();
state.onRecord(this, fields);
newState = state;
if (newState == State.STREAMING_STATE) {
record = new InternalRecord(runResponseHandler.queryKeys(), fields);
if (syncSignals) {
recordConsumer.accept(record, null);
}
}
}
if (!syncSignals && newState == State.STREAMING_STATE) {
recordConsumer.accept(record, null);
}
}

@Override
Expand All @@ -99,38 +174,6 @@ public synchronized void cancel() {
state.cancel(this);
}

protected void completeWithFailure(Throwable error) {
completionListener.afterFailure(error);
complete(extractResultSummary(emptyMap()), error);
}

protected void completeWithSuccess(Map<String, Value> metadata) {
completionListener.afterSuccess(metadata);
ResultSummary summary;
Neo4jException exception = null;
try {
summary = extractResultSummary(metadata);
} catch (Neo4jException e) {
summary = extractResultSummary(emptyMap());
exception = e;
}
complete(summary, exception);
}

protected void successHasMore() {
if (toRequest > 0 || toRequest == UNLIMITED_FETCH_SIZE) {
request(toRequest);
toRequest = 0;
}
// summary consumer use (null, null) to identify done handling of success with has_more
summaryConsumer.accept(null, null);
}

protected void handleRecord(Value[] fields) {
Record record = new InternalRecord(runResponseHandler.queryKeys(), fields);
recordConsumer.accept(record, null);
}

protected void writePull(long n) {
connection.writeAndFlush(new PullMessage(n, runResponseHandler.queryId()), this);
}
Expand Down Expand Up @@ -198,12 +241,15 @@ private void assertRecordAndSummaryConsumerInstalled() {
}
}

private void complete(ResultSummary summary, Throwable error) {
private void complete(
BiConsumer<ResultSummary, Throwable> summaryConsumer,
BiConsumer<Record, Throwable> recordConsumer,
ResultSummary summary,
Throwable error) {
// we first inform the summary consumer to ensure when streaming finished, summary is definitely available.
summaryConsumer.accept(summary, error);
// record consumer use (null, null) to identify the end of record stream
recordConsumer.accept(null, error);
dispose();
}

private void dispose() {
Expand All @@ -226,13 +272,11 @@ enum State {
@Override
void onSuccess(BasicPullResponseHandler context, Map<String, Value> metadata) {
context.state(SUCCEEDED_STATE);
context.completeWithSuccess(metadata);
}

@Override
void onFailure(BasicPullResponseHandler context, Throwable error) {
context.state(FAILURE_STATE);
context.completeWithFailure(error);
}

@Override
Expand All @@ -257,23 +301,19 @@ void cancel(BasicPullResponseHandler context) {
void onSuccess(BasicPullResponseHandler context, Map<String, Value> metadata) {
if (metadata.getOrDefault("has_more", BooleanValue.FALSE).asBoolean()) {
context.state(READY_STATE);
context.successHasMore();
} else {
context.state(SUCCEEDED_STATE);
context.completeWithSuccess(metadata);
}
}

@Override
void onFailure(BasicPullResponseHandler context, Throwable error) {
context.state(FAILURE_STATE);
context.completeWithFailure(error);
}

@Override
void onRecord(BasicPullResponseHandler context, Value[] fields) {
context.state(STREAMING_STATE);
context.handleRecord(fields);
}

@Override
Expand All @@ -295,14 +335,12 @@ void onSuccess(BasicPullResponseHandler context, Map<String, Value> metadata) {
context.discardAll();
} else {
context.state(SUCCEEDED_STATE);
context.completeWithSuccess(metadata);
}
}

@Override
void onFailure(BasicPullResponseHandler context, Throwable error) {
context.state(FAILURE_STATE);
context.completeWithFailure(error);
}

@Override
Expand All @@ -324,13 +362,11 @@ void cancel(BasicPullResponseHandler context) {
@Override
void onSuccess(BasicPullResponseHandler context, Map<String, Value> metadata) {
context.state(SUCCEEDED_STATE);
context.completeWithSuccess(metadata);
}

@Override
void onFailure(BasicPullResponseHandler context, Throwable error) {
context.state(FAILURE_STATE);
context.completeWithFailure(error);
}

@Override
Expand All @@ -352,13 +388,11 @@ void cancel(BasicPullResponseHandler context) {
@Override
void onSuccess(BasicPullResponseHandler context, Map<String, Value> metadata) {
context.state(SUCCEEDED_STATE);
context.completeWithSuccess(metadata);
}

@Override
void onFailure(BasicPullResponseHandler context, Throwable error) {
context.state(FAILURE_STATE);
context.completeWithFailure(error);
}

@Override
Expand Down

0 comments on commit 3495ef0

Please sign in to comment.