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Add QueryRunner.runRetryCompletableFuture method for java8+

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This commit is contained in:
Travis Burtrum 2017-07-02 23:02:16 -04:00
parent 8400ed3d00
commit 133c4eb8c9
2 changed files with 42 additions and 65 deletions
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102
common/src/main/java/com/moparisthebest/jdbc/QueryRunner.java
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@ -14,7 +14,7 @@ import static com.moparisthebest.jdbc.TryClose.tryClose;
public class QueryRunner<T extends JdbcMapper> {
private static final int defaultRetryCount = 10;
private static final DelayStrategy defaultDelayStrategy = new ExponentialBackoff();
private static final DelayStrategy defaultDelayStrategy = exponentialBackoff(1000, 30000, 2000);
private static final ExecutorService defaultExecutorService = Executors.newCachedThreadPool(); // todo: good or bad default?
private final Factory<T> factory;
@ -136,6 +136,21 @@ public class QueryRunner<T extends JdbcMapper> {
});
}
//IFJAVA8_START
public <E> CompletableFuture<E> runRetryCompletableFuture(final Runner<T, E> query) {
// todo: sleeps in thread, could use ScheduledExecutorService maybe?
return CompletableFuture.supplyAsync(() -> {
try {
return runRetry(query);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}, executorService);
}
//IFJAVA8_END
public static interface Runner<T, E> {
E run(T dao) throws SQLException;
}
@ -148,18 +163,6 @@ public class QueryRunner<T extends JdbcMapper> {
return defaultDelayStrategy;
}
public static DelayStrategy exponentialBackoff(long minBackoff, long maxBackoff, long slotTime) {
return new ExponentialBackoff(minBackoff, maxBackoff, slotTime);
}
public static DelayStrategy fixedDelay(long delay) {
return new FixedDelay(delay);
}
public static DelayStrategy incrementalDelay(long initialInterval, long incrementalInterval) {
return new IncrementalDelay(initialInterval, incrementalInterval);
}
/**
* Implements truncated binary exponential backoff to calculate retry delay per
* IEEE 802.3-2008 Section 1. There will be at most ten (10) contention periods
@ -167,60 +170,31 @@ public class QueryRunner<T extends JdbcMapper> {
*
* @author Robert Buck (buck.robert.j@gmail.com)
*/
private static class ExponentialBackoff implements DelayStrategy {
public static final long DEFAULT_MIN_BACKOFF = TimeUnit.MILLISECONDS.convert(1, TimeUnit.SECONDS);
public static final long DEFAULT_MAX_BACKOFF = TimeUnit.MILLISECONDS.convert(30, TimeUnit.SECONDS);
public static final long DEFAULT_SLOT_TIME = TimeUnit.MILLISECONDS.convert(2, TimeUnit.SECONDS);
private final long minBackoff;
private final long maxBackoff;
private final long slotTime;
private ExponentialBackoff() {
this(DEFAULT_MIN_BACKOFF, DEFAULT_MAX_BACKOFF, DEFAULT_SLOT_TIME);
}
private ExponentialBackoff(long minBackoff, long maxBackoff, long slotTime) {
this.minBackoff = minBackoff;
this.maxBackoff = maxBackoff;
this.slotTime = slotTime;
}
@Override
public long getDelay(final int retryCount) {
final int MAX_CONTENTION_PERIODS = 10;
return retryCount == 0 ? 0 : Math.min(minBackoff + ThreadLocalRandom.current().nextInt(2 << Math.min(retryCount, MAX_CONTENTION_PERIODS - 1)) * slotTime, maxBackoff);
}
public static DelayStrategy exponentialBackoff(final long minBackoff, final long maxBackoff, final long slotTime) {
return new DelayStrategy() {
@Override
public long getDelay(final int attempt) {
final int MAX_CONTENTION_PERIODS = 10;
return attempt == 0 ? 0 : Math.min(minBackoff + ThreadLocalRandom.current().nextInt(2 << Math.min(attempt, MAX_CONTENTION_PERIODS - 1)) * slotTime, maxBackoff);
}
};
}
private static class FixedDelay implements DelayStrategy {
private final long delay;
private FixedDelay(final long delay) {
this.delay = delay;
}
@Override
public long getDelay(final int attempt) {
return delay;
}
public static DelayStrategy fixedDelay(final long delay) {
return new DelayStrategy() {
@Override
public long getDelay(final int attempt) {
return delay;
}
};
}
private static class IncrementalDelay implements DelayStrategy {
private final long initialInterval;
private final long incrementalInterval;
private IncrementalDelay(long initialInterval, long incrementalInterval) {
this.initialInterval = initialInterval;
this.incrementalInterval = incrementalInterval;
}
@Override
public long getDelay(final int attempt) {
return initialInterval + incrementalInterval * attempt;
}
public static DelayStrategy incrementalDelay(final long initialInterval, final long incrementalInterval) {
return new DelayStrategy() {
@Override
public long getDelay(final int attempt) {
return initialInterval + incrementalInterval * attempt;
}
};
}
}

5
querymapper/src/test/java/com/moparisthebest/jdbc/QueryRunnerTest.java
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@ -25,7 +25,8 @@ public class QueryRunnerTest {
final Person actual =
//qr.run(
//qr.runRetry(
qr.runRetryFuture(
//qr.runRetryFuture(
qr.runRetryCompletableFuture(
new QueryRunner.Runner<QueryMapper, Person>() {
@Override
public Person run(final QueryMapper qm) throws SQLException {
@ -37,6 +38,8 @@ public class QueryRunnerTest {
}
})
.get()
//.join()
//.thenAccept(actual -> Assert.assertEquals(expected, actual))
;
/*
System.out.println("expected: " + expected);