Examples with BinaryLatch org.neo4j.util.concurrent.BinaryLatch used on opensource projects

Example 31 with BinaryLatch

use of org.neo4j.util.concurrent.BinaryLatch in project neo4j by neo4j.

the class TransactionIT method shouldReadYourOwnWrites.

@Test
void shouldReadYourOwnWrites() throws Exception {
    var latch = new BinaryLatch();
    String bookmarkPrefix = null;
    try (var machine = newStateMachineAfterAuth()) {
        var recorder = new BoltResponseRecorder();
        machine.process(run("CREATE (n:A {prop:'one'})"), nullResponseHandler());
        machine.process(pullAll(), recorder);
        var bookmark = ((TextValue) recorder.nextResponse().metadata("bookmark")).stringValue();
        bookmarkPrefix = bookmark.split(":")[0];
    }
    var dbVersion = env.lastClosedTxId();
    var thread = new Thread(() -> {
        try (BoltStateMachine machine = newStateMachineAfterAuth()) {
            latch.await();
            var recorder = new BoltResponseRecorder();
            machine.process(run("MATCH (n:A) SET n.prop = 'two'", EMPTY_MAP), nullResponseHandler());
            machine.process(pullAll(), recorder);
        } catch (Throwable connectionFatality) {
            throw new RuntimeException(connectionFatality);
        }
    });
    thread.start();
    var dbVersionAfterWrite = dbVersion + 1;
    try (var machine = newStateMachineAfterAuth()) {
        var recorder = new BoltResponseRecorder();
        latch.release();
        var bookmark = bookmarkPrefix + ":" + dbVersionAfterWrite;
        machine.process(begin(env.databaseIdRepository(), asMapValue(singletonMap("bookmarks", List.of(bookmark)))), recorder);
        machine.process(run("MATCH (n:A) RETURN n.prop"), recorder);
        machine.process(pullAll(), recorder);
        machine.process(commit(), recorder);
        assertThat(recorder.nextResponse()).satisfies(succeeded());
        assertThat(recorder.nextResponse()).satisfies(succeeded());
        assertThat(recorder.nextResponse()).satisfies(succeededWithRecord("two"));
        assertThat(recorder.nextResponse()).satisfies(succeededWithMetadata("bookmark", BOOKMARK_PATTERN));
    }
    thread.join();
}