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[break] Fix MetricName comparator for tags, MetricName#safeTags() returns SortedMap #272

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merged 5 commits into from
May 26, 2019
Merged

[break] Fix MetricName comparator for tags, MetricName#safeTags() returns SortedMap #272

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8435797
Fix MetricName comparator for tags
schlosna May 24, 2019
28fba1b
Make MetricName#safeTags NavigableMap
schlosna May 24, 2019
6dfa869
[break] MetricName is no longer Comparable
schlosna May 25, 2019
a201e13
Allow using Guava types in generated MetricName immutable builder & i…
schlosna May 25, 2019
b1e527d
Use SortedMap for safe tags
schlosna May 26, 2019
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4 changes: 1 addition & 3 deletions tritium-caffeine/src/main/java/com/palantir/tritium/metrics/caffeine/CaffeineCacheStats.java
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Expand Up @@ -71,9 +71,7 @@ public static void registerCache(TaggedMetricRegistry registry, Cache<?, ?> cach
});
}

static <K extends Comparable<K>> Map<K, Gauge<?>> createCacheGauges(
Cache<?, ?> cache,
Function<String, K> metricNamer) {
static <K> Map<K, Gauge<?>> createCacheGauges(Cache<?, ?> cache, Function<String, K> metricNamer) {
return InternalCacheMetrics.createMetrics(CaffeineStats.create(cache, 1, TimeUnit.SECONDS), metricNamer);
}
}
8 changes: 3 additions & 5 deletions tritium-metrics/src/main/java/com/palantir/tritium/metrics/InternalCacheMetrics.java
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Expand Up @@ -21,7 +21,7 @@
import com.codahale.metrics.RatioGauge;
import com.google.common.annotations.Beta;
import com.google.common.cache.Cache;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.ImmutableMap;
import com.palantir.tritium.metrics.registry.MetricName;
import com.palantir.tritium.metrics.registry.TaggedMetricRegistry;
import java.util.Map;
Expand All @@ -40,10 +40,8 @@
public final class InternalCacheMetrics {
private InternalCacheMetrics() {}

public static <K extends Comparable<K>> Map<K, Gauge<?>> createMetrics(
Stats stats,
Function<String, K> metricNamer) {
ImmutableSortedMap.Builder<K, Gauge<?>> builder = ImmutableSortedMap.naturalOrder();
public static <K> Map<K, Gauge<?>> createMetrics(Stats stats, Function<String, K> metricNamer) {
ImmutableMap.Builder<K, Gauge<?>> builder = ImmutableMap.builder();
stats.forEach((name, gauge) -> builder.put(metricNamer.apply(name), gauge));
return builder.build();
}
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4 changes: 2 additions & 2 deletions ...try/src/main/java/com/palantir/tritium/metrics/registry/AbstractTaggedMetricRegistry.java
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Expand Up @@ -25,7 +25,7 @@
import com.codahale.metrics.Metric;
import com.codahale.metrics.Reservoir;
import com.codahale.metrics.Timer;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.palantir.logsafe.SafeArg;
import com.palantir.logsafe.exceptions.SafeIllegalArgumentException;
Expand Down Expand Up @@ -143,7 +143,7 @@ public final Timer timer(MetricName metricName, Supplier<Timer> timerSupplier) {

@Override
public final Map<MetricName, Metric> getMetrics() {
ImmutableSortedMap.Builder<MetricName, Metric> result = ImmutableSortedMap.naturalOrder();
ImmutableMap.Builder<MetricName, Metric> result = ImmutableMap.builder();
result.putAll(registry);
taggedRegistries.forEach((tag, metrics) -> metrics.getMetrics()
.forEach((metricName, metric) -> result.put(
Expand Down
33 changes: 4 additions & 29 deletions tritium-registry/src/main/java/com/palantir/tritium/metrics/registry/MetricName.java
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Expand Up @@ -17,9 +17,7 @@
package com.palantir.tritium.metrics.registry;

import com.palantir.logsafe.Safe;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Map;
import java.util.NavigableMap;
import org.immutables.value.Value;

@Value.Immutable(prehash = true)
Expand All @@ -28,26 +26,7 @@
get = {"get*", "is*"},
overshadowImplementation = true,
visibility = Value.Style.ImplementationVisibility.PACKAGE)
public interface MetricName extends Comparable<MetricName> {

Comparator<Map.Entry<String, String>> entryComparator =
Map.Entry.<String, String>comparingByKey()
.thenComparing(Map.Entry.comparingByValue());
Comparator<MetricName> metricNameComparator =
Comparator.comparing(MetricName::safeName)
.thenComparing(metricName -> metricName.safeTags().entrySet(), (set1, set2) -> {
Iterator<Map.Entry<String, String>> i1 = set1.iterator();
Iterator<Map.Entry<String, String>> i2 = set2.iterator();
while (i1.hasNext() && i2.hasNext()) {
Map.Entry<String, String> e1 = i1.next();
Map.Entry<String, String> e2 = i2.next();
int compare = entryComparator.compare(e1, e2);
if (compare != 0) {
return compare;
}
}
return i1.hasNext() ? -1 : i2.hasNext() ? 1 : 0;
});
public interface MetricName {

/**
* General/abstract measure (e.g. server.response-time).
Expand All @@ -61,12 +40,8 @@ public interface MetricName extends Comparable<MetricName> {
* <p>
* All tags and keys must be {@link Safe} to log.
*/
Map<String, String> safeTags();

@Override
default int compareTo(MetricName that) {
return metricNameComparator.compare(this, that);
}
@Value.NaturalOrder
NavigableMap<String, String> safeTags();
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Should we loosen this to SortedMap?

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I'd prefer to just leave this as a NavigableMap as the underlying impl generated by immutables is a TreeMap either way with jdkOnly = true (though we could remove that since we already rely on Guava implementation dependency, created optional #273 for that).

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I'd prefer the guava approach. We heavily rely on guava immutable collections, and they will avoid collection re-allocations when we attempt to re-wrap them.

I'm not sure any of the functionality provided by NavigableMap will be helpful for safeTags, where SortedMap provides clear advantages. Using the less specific type allows more freedom to change the implementation in the future. That said, I'm not actually aware of a SortedMap implementation which doesn't also implement NavigableMap, so I defer to your judgement.

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ok, you convinced me, went with SortedMap for now


static Builder builder() {
return new Builder();
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47 changes: 32 additions & 15 deletions tritium-registry/src/test/java/com/palantir/tritium/metrics/registry/MetricNameTest.java
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Expand Up @@ -27,45 +27,62 @@ public void compareSame() {
MetricName one = MetricName.builder()
.safeName("test")
.putSafeTags("key", "value")
.putSafeTags("key1", "value1")
.putSafeTags("key2", "value2")
.build();
MetricName two = MetricName.builder()
.safeName("test")
.putSafeTags("key2", "value2")
.putSafeTags("key", "value")
.putSafeTags("key1", "value1")
.build();

assertThat(one).isEqualTo(two);
assertThat(two).isEqualTo(one);
assertThat(one).isEqualByComparingTo(two);
assertThat(one).usingComparator(MetricName.metricNameComparator).isEqualByComparingTo(two);

assertThat(one.toString()).isEqualTo(two.toString());
}

@Test
public void compareName() {
assertThat(MetricName.builder().safeName("a").build())
.isEqualTo(MetricName.builder().safeName("a").build());

assertThat(MetricName.builder().safeName("a").build())
.isNotEqualTo(MetricName.builder().safeName("b").build());
}

@Test
public void compareNameOrder() {
public void compareTagNames() {
MetricName one = MetricName.builder()
.safeName("a")
.putSafeTags("key", "value")
.putSafeTags("key1", "value1")
.putSafeTags("key2", "value2")
.build();
MetricName two = MetricName.builder()
.safeName("b")
.putSafeTags("key", "value")
.safeName("a")
.putSafeTags("key1", "value1")
.putSafeTags("key3", "value2")
.build();

assertThat(one).isLessThan(two);
assertThat(two).isGreaterThan(one);
assertThat(one).isNotEqualTo(two);
assertThat(two).isNotEqualTo(one);
}

@Test
public void compareSameName() {
public void compareTagValues() {
MetricName one = MetricName.builder()
.safeName("test")
.putSafeTags("a", "value")
.safeName("a")
.putSafeTags("key1", "value1")
.putSafeTags("key2", "value2")
.build();
MetricName two = MetricName.builder()
.safeName("test")
.putSafeTags("b", "value")
.safeName("a")
.putSafeTags("key1", "value1")
.putSafeTags("key2", "valueZ")
.build();

assertThat(one).isLessThan(two);
assertThat(two).isGreaterThan(one);
assertThat(one).isNotEqualTo(two);
assertThat(two).isNotEqualTo(one);
}
}
27 changes: 27 additions & 0 deletions ...egistry/src/test/java/com/palantir/tritium/metrics/registry/TaggedMetricRegistryTest.java
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Expand Up @@ -215,6 +215,33 @@ public void testReplaceMetricRegistry() {
assertThat(registry.getMetrics()).isEmpty();
}

@Test
public void testGetMetrics() {
MetricName metricName = MetricName.builder()
.safeName("counter1")
.putSafeTags("tagA", Long.toString(1))
.putSafeTags("tagB", Long.toString(2))
.build();
Counter counter = registry.counter(metricName);
counter.inc();
Metric metric = registry.getMetrics().get(metricName);
assertThat(metric)
.isInstanceOf(Counter.class)
.isSameAs(counter)
.isSameAs(registry.counter(
MetricName.builder()
.safeName("counter1")
.putSafeTags("tagB", "2")
.putSafeTags("tagA", Long.toString(1))
.build()))
.isSameAs(registry.getMetrics().get(MetricName.builder()
.safeName("counter1")
.putSafeTags("tagA", Long.toString(1))
.putSafeTags("tagB", Integer.toString(2))
.build()));
assertThat(counter.getCount()).isEqualTo(1);
}

private void assertMetric(String name, String tagKey, String tagValue, Meter meter) {
assertThat(registry.getMetrics())
.containsEntry(MetricName.builder().safeName(name).putSafeTags(tagKey, tagValue).build(), meter);
Expand Down