Examples with AbortedException com.google.cloud.spanner.AbortedException used on opensource projects

Example 1 with AbortedException

use of com.google.cloud.spanner.AbortedException in project google-cloud-java by GoogleCloudPlatform.

the class ITTransactionTest method readAbort.

@Test
public void readAbort() throws InterruptedException {
    final String key1 = uniqueKey();
    final String key2 = uniqueKey();
    client.write(Arrays.asList(Mutation.newInsertBuilder("T").set("K").to(key1).set("V").to(0).build(), Mutation.newInsertBuilder("T").set("K").to(key2).set("V").to(1).build()));
    final CountDownLatch t1Started = new CountDownLatch(1);
    final CountDownLatch t1Done = new CountDownLatch(1);
    final CountDownLatch t2Running = new CountDownLatch(1);
    final CountDownLatch t2Done = new CountDownLatch(1);
    // Thread 1 performs a read before notifying that it has started and allowing
    // thread 2 to start.  This ensures that it establishes a senior lock priority relative to
    // thread 2.  It then waits for thread 2 to read, so that both threads have shared locks on
    // key1, before continuing to commit; the act of committing means that thread 1's lock is
    // upgraded and thread 2's transaction is aborted.  When thread 1 is done, thread 2 tries a
    // second read, which will abort.  Both threads will mask SpannerExceptions to ensure that
    // the implementation does not require TransactionCallable to propagate them.
    Thread t1 = new Thread() {

        @Override
        public void run() {
            client.readWriteTransaction().run(new TransactionCallable<Void>() {

                @Override
                public Void run(TransactionContext transaction) throws SpannerException {
                    try {
                        Struct row = transaction.readRow("T", Key.of(key1), Arrays.asList("V"));
                        t1Started.countDown();
                        Uninterruptibles.awaitUninterruptibly(t2Running);
                        transaction.buffer(Mutation.newUpdateBuilder("T").set("K").to(key1).set("V").to(row.getLong(0) + 1).build());
                        return null;
                    } catch (SpannerException e) {
                        if (e.getErrorCode() == ErrorCode.ABORTED) {
                            assertThat(e).isInstanceOf(AbortedException.class);
                            assertThat(((AbortedException) e).getRetryDelayInMillis()).isNotEqualTo(-1L);
                        }
                        throw new RuntimeException("Swallowed exception: " + e.getMessage());
                    }
                }
            });
            t1Done.countDown();
        }
    };
    Thread t2 = new Thread() {

        @Override
        public void run() {
            client.readWriteTransaction().run(new TransactionCallable<Void>() {

                @Override
                public Void run(TransactionContext transaction) throws SpannerException {
                    try {
                        Struct r1 = transaction.readRow("T", Key.of(key1), Arrays.asList("V"));
                        t2Running.countDown();
                        Uninterruptibles.awaitUninterruptibly(t1Done);
                        Struct r2 = transaction.readRow("T", Key.of(key2), Arrays.asList("V"));
                        transaction.buffer(Mutation.newUpdateBuilder("T").set("K").to(key2).set("V").to(r1.getLong(0) + r2.getLong(0)).build());
                        return null;
                    } catch (SpannerException e) {
                        if (e.getErrorCode() == ErrorCode.ABORTED) {
                            assertThat(e).isInstanceOf(AbortedException.class);
                            assertThat(((AbortedException) e).getRetryDelayInMillis()).isNotEqualTo(-1L);
                        }
                        throw new RuntimeException("Swallowed exception: " + e.getMessage());
                    }
                }
            });
            t2Done.countDown();
        }
    };
    t1.start();
    Uninterruptibles.awaitUninterruptibly(t1Started);
    // Thread 2 will abort on the first attempt and should retry; wait for completion to confirm.
    t2.start();
    assertThat(t2Done.await(1, TimeUnit.MINUTES)).isTrue();
    // Check that both transactions effects are visible.
    assertThat(client.singleUse(TimestampBound.strong()).readRow("T", Key.of(key1), Arrays.asList("V")).getLong(0)).isEqualTo(1);
    assertThat(client.singleUse(TimestampBound.strong()).readRow("T", Key.of(key2), Arrays.asList("V")).getLong(0)).isEqualTo(2);
}