Package com.ryantenney.metrics.spring

Source Code of com.ryantenney.metrics.spring.GaugeFieldAnnotationBeanPostProcessor

/**
* Copyright (C) 2012 Ryan W Tenney (ryan@10e.us)
*
* 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.ryantenney.metrics.spring;

import java.lang.reflect.Field;

import org.springframework.core.Ordered;
import org.springframework.util.ReflectionUtils;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.annotation.Gauge;

import static com.ryantenney.metrics.spring.AnnotationFilter.INSTANCE_FIELDS;

class GaugeFieldAnnotationBeanPostProcessor extends AbstractAnnotationBeanPostProcessor implements Ordered {

  private static final AnnotationFilter FILTER = new AnnotationFilter(Gauge.class, INSTANCE_FIELDS);

  private final MetricRegistry metrics;

  public GaugeFieldAnnotationBeanPostProcessor(final MetricRegistry metrics) {
    super(Members.ALL, Phase.PRE_INIT, FILTER);
    this.metrics = metrics;
  }

  @Override
  protected void withField(final Object bean, String beanName, Class<?> targetClass, final Field field) {
    ReflectionUtils.makeAccessible(field);

    final Gauge annotation = field.getAnnotation(Gauge.class);
    final String metricName = Util.forGauge(targetClass, field, annotation);

    metrics.register(metricName, new com.codahale.metrics.Gauge<Object>() {
      @Override
      public Object getValue() {
        Object value = ReflectionUtils.getField(field, bean);
        if (value instanceof com.codahale.metrics.Gauge) {
          value = ((com.codahale.metrics.Gauge<?>) value).getValue();
        }
        return value;
      }
    });

    LOG.debug("Created gauge {} for field {}.{}", metricName, targetClass.getCanonicalName(), field.getName());
  }

  @Override
  public int getOrder() {
    return LOWEST_PRECEDENCE;
  }

}
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