Search for Alarm with name in Cloudwatch - aws-sdk

Question

Is it possible to search for an alarm or to check if alarm already exists in CloudWatch using Java api?
I am currently doing this way but it doesnt look promising to me.
long offsetInMilliseconds = 1000 * 60 * 60 * 24;
Dimension instanceDimension = new Dimension();
instanceDimension.setName("InstanceId");
instanceDimension.setValue("i-201cb891");
//Check is Alarms with name exist.
GetMetricStatisticsRequest getMetricStatisticsRequest = new GetMetricStatisticsRequest()
.withStartTime(new Date(new Date().getTime() - offsetInMilliseconds))
.withNamespace("AWS/EC2")
.withPeriod(60 * 60)
.withMetricName("StatusCheckFailed")
.withStatistics("Average")
.withDimensions(Arrays.asList(instanceDimension))
.withEndTime(new Date());
GetMetricStatisticsResult getMetricStatisticsResult = cloudWatch.getMetricStatistics(getMetricStatisticsRequest);
System.out.println("" + getMetricStatisticsResult.getDatapoints().size());
if(getMetricStatisticsResult.getDatapoints().size() == 0) {
PutMetricAlarmRequest request = new PutMetricAlarmRequest()
.withActionsEnabled(true).withAlarmName("i-201cb891")
.withComparisonOperator(ComparisonOperator.GreaterThanOrEqualToThreshold)
.withDimensions(Arrays.asList(instanceDimension))
// .withAlarmActions(getTopicARN())
.withEvaluationPeriods(1)
.withPeriod(60)
.withThreshold(60.0D)
.withStatistic(Statistic.Average)
.withMetricName("StatusCheckFailed")
.withNamespace("AWS/EC2");
cloudWatch.putMetricAlarm(request);
System.out.println("Alarm created for Instance with ID : " + "i-201cb891");
}else{
System.out.println("Alarm exists with name : " + "i-201cb891");
}

Answer 1

You can use AmazonCloudWatch interface to query for your alarms.
From AmazonCloudWatch API:
DescribeAlarmsResult describeAlarms(DescribeAlarmsRequest describeAlarmsRequest)
You can use this method to query for your alarms by name or by prefix, for instance.
The following code snippet shows how to use the API:
...
AmazonCloudWatch client = new AmazonCloudWatchClient(new ProfileCredentialsProvider());
DescribeAlarmsRequest request = new DescribeAlarmsRequest();
List<String> alarmNames = new ArrayList<String>();
alarmNames.add("alarmName1");
alarmNames.add("alarmName2");
request.setAlarmNames(alarmNames);
DescribeAlarmsResult result = client.describeAlarms(request);
List<MetricAlarm> alarms = result.getMetricAlarms();
for (MetricAlarm alarm : alarms) {
System.out.println(alarm.getAlarmName());
}
...
AWS SDK for Java API Reference - 1.10.43