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/*
* (c) Copyright 2021 Palantir Technologies Inc. All rights reserved.
*
* 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.palantir.atlasdb.cassandra;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.palantir.conjure.java.api.config.service.HumanReadableDuration;
import com.palantir.logsafe.Preconditions;
import com.palantir.logsafe.SafeArg;
import com.palantir.logsafe.UnsafeArg;
import com.palantir.logsafe.logger.SafeLogger;
import com.palantir.logsafe.logger.SafeLoggerFactory;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import org.immutables.value.Value;
@Value.Immutable
@JsonDeserialize(as = ImmutableCassandraTracingConfig.class)
@JsonSerialize(as = ImmutableCassandraTracingConfig.class)
public abstract class CassandraTracingConfig {
private static final SafeLogger log = SafeLoggerFactory.get(CassandraTracingConfig.class);
private static final AtomicBoolean loggedWarning = new AtomicBoolean();
@JsonProperty("enabled")
@Value.Default
public boolean enabled() {
return false;
}
@JsonProperty("trace-probability")
@Value.Default
public double traceProbability() {
return 1.0;
}
@JsonProperty("tables-to-trace")
public abstract Set tablesToTrace();
@JsonProperty("min-duration-to-log")
@Value.Default
public HumanReadableDuration minDurationToLog() {
return HumanReadableDuration.milliseconds(0);
}
@Value.Check
protected void check() {
if (enabled()) {
Preconditions.checkArgument(
traceProbability() > 0,
"trace-probability must be greater than 0 if tracing is enabled",
SafeArg.of("traceProbability", traceProbability()));
// Just log a warning once. In witchcraft runtime config is reparsed every second which means this would
// log every second.
if (loggedWarning.compareAndSet(false, true)) {
log.warn(
"Tracing is enabled. This incurs a large performance hit and should only be used for short"
+ " periods of debugging. [trace-probability = {}, min-duration-to-log-ms = {},"
+ " tables-to-trace = {}]",
SafeArg.of("trace-probability", traceProbability()),
SafeArg.of("min-duration-to-log", minDurationToLog()),
UnsafeArg.of("tables-to-trace", tablesToTrace()));
}
}
}
}