/
TraceCommand.java
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/
TraceCommand.java
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/*
* Copyright 2013-2018 the original author or authors.
*
* 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 org.springframework.cloud.sleuth.instrument.hystrix;
import brave.Span;
import brave.Tracer;
import com.netflix.hystrix.HystrixCommand;
/**
* Abstraction over {@code HystrixCommand} that wraps command execution with Trace setting
*
* @see HystrixCommand
* @see Tracer
*
* @author Tomasz Nurkiewicz, 4financeIT
* @author Marcin Grzejszczak
* @author Spencer Gibb
* @since 1.0.0
*/
public abstract class TraceCommand<R> extends HystrixCommand<R> {
private static final String COMMAND_KEY = "commandKey";
private static final String COMMAND_GROUP_KEY = "commandGroup";
private static final String THREAD_POOL_KEY = "threadPoolKey";
private final Tracer tracer;
private final Span span;
protected TraceCommand(Tracer tracer, Setter setter) {
super(setter);
this.tracer = tracer;
this.span = this.tracer.nextSpan();
}
@Override
protected R run() throws Exception {
String commandKeyName = getCommandKey().name();
Span span = this.span.name(commandKeyName);
span.tag(COMMAND_KEY, commandKeyName);
span.tag(COMMAND_GROUP_KEY, getCommandGroup().name());
span.tag(THREAD_POOL_KEY, getThreadPoolKey().name());
try (Tracer.SpanInScope ws = this.tracer.withSpanInScope(span.start())) {
return doRun();
}
finally {
span.finish();
}
}
public abstract R doRun() throws Exception;
}