/**
* 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 org.apache.hadoop.yarn.server.applicationhistoryservice.metrics.loadsimulator.net;
import java.io.PrintStream;
/**
* StdOutMetricsSender dumps metrics to defined PrintStream out. It is useful for testing.
*/
public class StdOutMetricsSender implements MetricsSender {
public final PrintStream out;
private String metricsHostName;
/**
* Creates new StdOutMetricsSender with specified hostname (only used in messages) and sends output to System.out
*
* @param metricsHostName a name used in printed messages
*/
public StdOutMetricsSender(String metricsHostName) {
this(metricsHostName, System.out);
}
/**
* Creates new StdOutMetricsSender with specified hostname (only used in messages) and PrintStream which is used as
* an output.
*
* @param metricsHostName a name used in printed messages
* @param out PrintStream that the Sender will write to, can be System.out
*/
public StdOutMetricsSender(String metricsHostName, PrintStream out) {
this.metricsHostName = metricsHostName;
this.out = out;
}
@Override
public String pushMetrics(String payload) {
out.println("Sending to " + metricsHostName + ": " + payload);
return "OK";
}
}