org.springframework.cloud.sleuth.instrument.async.LazyTraceThreadPoolTaskExecutor.java Source code

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Here is the source code for org.springframework.cloud.sleuth.instrument.async.LazyTraceThreadPoolTaskExecutor.java

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/*
 * Copyright 2013-2016 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.async;

import java.lang.invoke.MethodHandles;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadPoolExecutor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.cloud.sleuth.DefaultSpanNamer;
import org.springframework.cloud.sleuth.SpanNamer;
import org.springframework.cloud.sleuth.TraceKeys;
import org.springframework.cloud.sleuth.Tracer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.util.concurrent.ListenableFuture;

/**
 * {@link ThreadPoolTaskExecutor} that continues a span if one was passed or creates a new one
 *
 * @author Marcin Grzejszczak
 * @since 1.0.10
 */
@SuppressWarnings("serial")
public class LazyTraceThreadPoolTaskExecutor extends ThreadPoolTaskExecutor {

    private static final Log log = LogFactory.getLog(MethodHandles.lookup().lookupClass());

    private Tracer tracer;
    private final BeanFactory beanFactory;
    private final ThreadPoolTaskExecutor delegate;
    private TraceKeys traceKeys;
    private SpanNamer spanNamer;

    public LazyTraceThreadPoolTaskExecutor(BeanFactory beanFactory, ThreadPoolTaskExecutor delegate) {
        this.beanFactory = beanFactory;
        this.delegate = delegate;
    }

    @Override
    public void execute(Runnable task) {
        this.delegate.execute(new SpanContinuingTraceRunnable(tracer(), traceKeys(), spanNamer(), task));
    }

    @Override
    public void execute(Runnable task, long startTimeout) {
        this.delegate.execute(new SpanContinuingTraceRunnable(tracer(), traceKeys(), spanNamer(), task),
                startTimeout);
    }

    @Override
    public Future<?> submit(Runnable task) {
        return this.delegate.submit(new SpanContinuingTraceRunnable(tracer(), traceKeys(), spanNamer(), task));
    }

    @Override
    public <T> Future<T> submit(Callable<T> task) {
        return this.delegate.submit(new SpanContinuingTraceCallable<>(tracer(), traceKeys(), spanNamer(), task));
    }

    @Override
    public ListenableFuture<?> submitListenable(Runnable task) {
        return this.delegate
                .submitListenable(new SpanContinuingTraceRunnable(tracer(), traceKeys(), spanNamer(), task));
    }

    @Override
    public <T> ListenableFuture<T> submitListenable(Callable<T> task) {
        return this.delegate
                .submitListenable(new SpanContinuingTraceCallable<>(tracer(), traceKeys(), spanNamer(), task));
    }

    @Override
    public ThreadPoolExecutor getThreadPoolExecutor() throws IllegalStateException {
        return this.delegate.getThreadPoolExecutor();
    }

    public void destroy() {
        this.delegate.destroy();
        super.destroy();
    }

    @Override
    public void afterPropertiesSet() {
        this.delegate.afterPropertiesSet();
        super.afterPropertiesSet();
    }

    private Tracer tracer() {
        if (this.tracer == null) {
            this.tracer = this.beanFactory.getBean(Tracer.class);
        }
        return this.tracer;
    }

    private TraceKeys traceKeys() {
        if (this.traceKeys == null) {
            try {
                this.traceKeys = this.beanFactory.getBean(TraceKeys.class);
            } catch (NoSuchBeanDefinitionException e) {
                log.warn("TraceKeys bean not found - will provide a manually created instance");
                return new TraceKeys();
            }
        }
        return this.traceKeys;
    }

    private SpanNamer spanNamer() {
        if (this.spanNamer == null) {
            try {
                this.spanNamer = this.beanFactory.getBean(SpanNamer.class);
            } catch (NoSuchBeanDefinitionException e) {
                log.warn("SpanNamer bean not found - will provide a manually created instance");
                return new DefaultSpanNamer();
            }
        }
        return this.spanNamer;
    }
}