/
SpannerRetryHelper.java
94 lines (87 loc) · 3.65 KB
/
SpannerRetryHelper.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
/*
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.cloud.spanner;
import com.google.api.core.NanoClock;
import com.google.api.gax.retrying.ResultRetryAlgorithm;
import com.google.api.gax.retrying.RetrySettings;
import com.google.api.gax.retrying.TimedAttemptSettings;
import com.google.cloud.RetryHelper;
import com.google.cloud.RetryHelper.RetryHelperException;
import com.google.cloud.spanner.v1.stub.SpannerStub;
import com.google.cloud.spanner.v1.stub.SpannerStubSettings;
import com.google.common.base.Throwables;
import com.google.spanner.v1.RollbackRequest;
import io.grpc.Context;
import java.util.concurrent.Callable;
import java.util.concurrent.CancellationException;
import org.threeten.bp.Duration;
/**
* Util class for retrying aborted transactions. This class is a wrapper around {@link RetryHelper}
* that uses specific settings to only retry on aborted transactions, without a timeout and without
* a cap on the number of retries.
*/
class SpannerRetryHelper {
/**
* Use the same {@link RetrySettings} for retrying an aborted transaction as for retrying a {@link
* RollbackRequest}. The {@link RollbackRequest} automatically uses the default retry settings
* defined for the {@link SpannerStub}. By referencing these settings, the retry settings for
* retrying aborted transactions will also automatically be updated if the default retry settings
* are updated.
*
* <p>These default {@link RetrySettings} are only used if no retry information is returned by the
* {@link AbortedException}.
*/
private static final RetrySettings txRetrySettings =
SpannerStubSettings.newBuilder().rollbackSettings().getRetrySettings();
/** Executes the {@link Callable} and retries if it fails with an {@link AbortedException}. */
static <T> T runTxWithRetriesOnAborted(Callable<T> callable) {
try {
return RetryHelper.runWithRetries(
callable, txRetrySettings, new TxRetryAlgorithm<>(), NanoClock.getDefaultClock());
} catch (RetryHelperException e) {
if (e.getCause() != null) {
Throwables.throwIfUnchecked(e.getCause());
}
throw e;
}
}
private static class TxRetryAlgorithm<T> implements ResultRetryAlgorithm<T> {
@Override
public TimedAttemptSettings createNextAttempt(
Throwable prevThrowable, T prevResponse, TimedAttemptSettings prevSettings) {
if (prevThrowable != null) {
long retryDelay = SpannerException.extractRetryDelay(prevThrowable);
if (retryDelay > -1L) {
return prevSettings
.toBuilder()
.setRandomizedRetryDelay(Duration.ofMillis(retryDelay))
.build();
}
}
return null;
}
@Override
public boolean shouldRetry(Throwable prevThrowable, T prevResponse)
throws CancellationException {
if (Context.current().isCancelled()) {
throw SpannerExceptionFactory.newSpannerExceptionForCancellation(Context.current(), null);
}
return prevThrowable != null
&& (prevThrowable instanceof AbortedException
|| prevThrowable instanceof com.google.api.gax.rpc.AbortedException);
}
}
}