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本文主要研究一下springboot的Customizer
TaskExecutorCustomizer
代码语言：javascript复制@FunctionalInterface
public interface TaskExecutorCustomizer {
/**
* Callback to customize a {@link ThreadPoolTaskExecutor} instance.
* @param taskExecutor the task executor to customize
*/
void customize(ThreadPoolTaskExecutor taskExecutor);
}
之后再构造的时候通过ObjectProvider获取即可
代码语言：javascript复制 @Bean
@ConditionalOnMissingBean
public TaskExecutorBuilder taskExecutorBuilder(TaskExecutionProperties properties,
ObjectProvider<TaskExecutorCustomizer> taskExecutorCustomizers,
ObjectProvider<TaskDecorator> taskDecorator) {
TaskExecutionProperties.Pool pool = properties.getPool();
TaskExecutorBuilder builder = new TaskExecutorBuilder();
builder = builder.queueCapacity(pool.getQueueCapacity());
builder = builder.corePoolSize(pool.getCoreSize());
builder = builder.maxPoolSize(pool.getMaxSize());
builder = builder.allowCoreThreadTimeOut(pool.isAllowCoreThreadTimeout());
builder = builder.keepAlive(pool.getKeepAlive());
Shutdown shutdown = properties.getShutdown();
builder = builder.awaitTermination(shutdown.isAwaitTermination());
builder = builder.awaitTerminationPeriod(shutdown.getAwaitTerminationPeriod());
builder = builder.threadNamePrefix(properties.getThreadNamePrefix());
builder = builder.customizers(taskExecutorCustomizers.orderedStream()::iterator);
builder = builder.taskDecorator(taskDecorator.getIfUnique());
return builder;
}
/**
* Set the {@link TaskExecutorCustomizer TaskExecutorCustomizers} that should be
* applied to the {@link ThreadPoolTaskExecutor}. Customizers are applied in the order
* that they were added after builder configuration has been applied. Setting this
* value will replace any previously configured customizers.
* @param customizers the customizers to set
* @return a new builder instance
* @see #additionalCustomizers(TaskExecutorCustomizer...)
*/
public TaskExecutorBuilder customizers(TaskExecutorCustomizer... customizers) {
Assert.notNull(customizers, "Customizers must not be null");
return customizers(Arrays.asList(customizers));
}
TaskSchedulerCustomizer
代码语言：javascript复制@FunctionalInterface
public interface TaskSchedulerCustomizer {
/**
* Callback to customize a {@link ThreadPoolTaskScheduler} instance.
* @param taskScheduler the task scheduler to customize
*/
void customize(ThreadPoolTaskScheduler taskScheduler);
}
@Bean
@ConditionalOnMissingBean
public TaskSchedulerBuilder taskSchedulerBuilder(TaskSchedulingProperties properties,
ObjectProvider<TaskSchedulerCustomizer> taskSchedulerCustomizers) {
TaskSchedulerBuilder builder = new TaskSchedulerBuilder();
builder = builder.poolSize(properties.getPool().getSize());
Shutdown shutdown = properties.getShutdown();
builder = builder.awaitTermination(shutdown.isAwaitTermination());
builder = builder.awaitTerminationPeriod(shutdown.getAwaitTerminationPeriod());
builder = builder.threadNamePrefix(properties.getThreadNamePrefix());
builder = builder.customizers(taskSchedulerCustomizers);
return builder;
}
/**
* Set the {@link TaskSchedulerCustomizer TaskSchedulerCustomizers} that should be
* applied to the {@link ThreadPoolTaskScheduler}. Customizers are applied in the
* order that they were added after builder configuration has been applied. Setting
* this value will replace any previously configured customizers.
* @param customizers the customizers to set
* @return a new builder instance
* @see #additionalCustomizers(TaskSchedulerCustomizer...)
*/
public TaskSchedulerBuilder customizers(TaskSchedulerCustomizer... customizers) {
Assert.notNull(customizers, "Customizers must not be null");
return customizers(Arrays.asList(customizers));
}
RestTemplateCustomizer
代码语言：javascript复制@FunctionalInterface
public interface RestTemplateCustomizer {
/**
* Callback to customize a {@link RestTemplate} instance.
* @param restTemplate the template to customize
*/
void customize(RestTemplate restTemplate);
}
@Bean
@Lazy
@ConditionalOnMissingBean
public RestTemplateBuilderConfigurer restTemplateBuilderConfigurer(
ObjectProvider<HttpMessageConverters> messageConverters,
ObjectProvider<RestTemplateCustomizer> restTemplateCustomizers,
ObjectProvider<RestTemplateRequestCustomizer<?>> restTemplateRequestCustomizers) {
RestTemplateBuilderConfigurer configurer = new RestTemplateBuilderConfigurer();
configurer.setHttpMessageConverters(messageConverters.getIfUnique());
configurer.setRestTemplateCustomizers(restTemplateCustomizers.orderedStream().collect(Collectors.toList()));
configurer.setRestTemplateRequestCustomizers(
restTemplateRequestCustomizers.orderedStream().collect(Collectors.toList()));
return configurer;
}
小结
springboot提供了很多Customizer接口方便用户自行扩展，非常值得设计组件的时候使用
