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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 spark.metrics.sink
import com.codahale.metrics.MetricRegistry
import com.codahale.metrics.json.MetricsModule
import com.fasterxml.jackson.databind.ObjectMapper
import java.util.Properties
import java.util.concurrent.TimeUnit
import javax.servlet.http.HttpServletRequest
import org.eclipse.jetty.server.Handler
import spark.ui.JettyUtils
class MetricsServlet(val property: Properties, val registry: MetricRegistry) extends Sink {
val SERVLET_KEY_URI = "uri"
val SERVLET_KEY_SAMPLE = "sample"
val servletURI = property.getProperty(SERVLET_KEY_URI)
val servletShowSample = property.getProperty(SERVLET_KEY_SAMPLE).toBoolean
val mapper = new ObjectMapper().registerModule(
new MetricsModule(TimeUnit.SECONDS, TimeUnit.MILLISECONDS, servletShowSample))
def getHandlers = Array[(String, Handler)](
(servletURI, JettyUtils.createHandler(request => getMetricsSnapshot(request), "text/json"))
)
def getMetricsSnapshot(request: HttpServletRequest): String = {
mapper.writeValueAsString(registry)
}
override def start() { }
override def stop() { }
}
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