AWS JAVA client examples for Auto Scaling metrics (Asynchronous)

Below are few code snippets for gathering Auto Scaling metrics from CloudWatch using the AWS Java Async Client (AmazonCloudWatchAsyncClient). Its very similar to the other code snippets I have shared. The only thing that took me almost a day to discover was the namespace which according to the documentation should be "AWS/AutoScaling" but what actually worked for me was "AWS/EC2"

:(

As always first create the client:

AWSCredentials credentials = new BasicAWSCredentials(obj.getString("AWS_ACCESS_KEY"),obj.getString("AWS_SECRET_KEY")); 
ClientConfiguration config = new ClientConfiguration(); 
config.setMaxConnections(1); // This is done to create fixed number of connections per client
AmazonCloudWatchAsyncClient client = new AmazonCloudWatchAsyncClient(credentials);
client.setConfiguration(config);

Now a utility method to initialize the request object:

private static GetMetricStatisticsRequest initializeRequestObject(AmazonCloudWatchAsyncClient client,JSONObject groupDetails){ 
    GetMetricStatisticsRequest request   = new GetMetricStatisticsRequest();
     
    request.setPeriod(60*5); // 5 minutes 
     
    request.setNamespace("AWS/EC2"); 
         
    List<Dimension> dims  = new ArrayList<Dimension>(); 
    Dimension dim  = new Dimension(); 
    dim.setName("AutoScalingGroupName"); 
    dim.setValue(groupDetails.getString("NAME")); 
    dims.add(dim); 
     
    Date end = new Date(); 
    request.setEndTime(end); 
    // Back up 5 minutes 
    Date beg = new Date(end.getTime() - 10*60*1000); 
    request.setStartTime(beg); 
    request.setDimensions(dims); 
    return request; 
}

Lets gather some metrics now:

    public static void get5MinCPUUtilization(AmazonCloudWatchAsyncClient client, final JSONObject groupDetails, final String clientName){ 
        client.setEndpoint(groupDetails.getString("END_POINT")); 
        GetMetricStatisticsRequest request = initializeRequestObject(client, groupDetails); 
         
        request.setMetricName("CPUUtilization"); 
        request.setUnit(StandardUnit.Percent); 
         
        List<String> stats = new ArrayList<String>(); 
        stats.add("Average"); 
        stats.add("Maximum"); 
        stats.add("Minimum"); 
        request.setStatistics(stats); 
         
        client.getMetricStatisticsAsync(request, new AsyncHandler<GetMetricStatisticsRequest, GetMetricStatisticsResult>() { 
             
            @Override 
            public void onSuccess(GetMetricStatisticsRequest arg0,
                    GetMetricStatisticsResult arg1) { 
                List<Datapoint> data = arg1.getDatapoints(); 
                Double avg = data.size() > 0 ? data.get(0).getAverage() : 0.0; 
                Double min = data.size() > 0 ? data.get(0).getMinimum() : 0.0; 
                Double max = data.size() > 0 ? data.get(0).getMaximum() : 0.0; 
                 
            } 
             
            @Override 
            public void onError(Exception arg0) {
                 
            } 
        }); 
        return; 
    } 
     
    public static void get5MinDiskReadOps(AmazonCloudWatchAsyncClient client, final JSONObject groupDetails, final String clientName){ 
        client.setEndpoint(groupDetails.getString("END_POINT")); 
        GetMetricStatisticsRequest request = initializeRequestObject(client, groupDetails); 
         
        request.setMetricName("DiskReadOps"); 
        request.setUnit(StandardUnit.Count); 
         
        List<String> stats = new ArrayList<String>(); 
        stats.add("Average"); 
        stats.add("Maximum"); 
        stats.add("Minimum"); 
        request.setStatistics(stats); 
         
        client.getMetricStatisticsAsync(request, new AsyncHandler<GetMetricStatisticsRequest, GetMetricStatisticsResult>() { 
             
            @Override 
            public void onSuccess(GetMetricStatisticsRequest arg0,
                    GetMetricStatisticsResult arg1) { 
                List<Datapoint> data = arg1.getDatapoints(); 
                Double avg = data.size() > 0 ? data.get(0).getAverage() : 0.0; 
                Double min = data.size() > 0 ? data.get(0).getMinimum() : 0.0; 
                Double max = data.size() > 0 ? data.get(0).getMaximum() : 0.0; 
                 
            } 
             
            @Override 
            public void onError(Exception arg0) {
            } 
        }); 
        return; 
    } 
     
    public static void get5MinStatusCheckFailed(AmazonCloudWatchAsyncClient client, final JSONObject groupDetails, final String clientName){ 
        client.setEndpoint(groupDetails.getString("END_POINT")); 
        GetMetricStatisticsRequest request = initializeRequestObject(client, groupDetails); 
         
        request.setMetricName("StatusCheckFailed"); 
        request.setUnit(StandardUnit.Count); 
         
        List<String> stats = new ArrayList<String>(); 
        stats.add("Average"); 
        stats.add("Maximum"); 
        stats.add("Minimum"); 
        request.setStatistics(stats); 
         
        client.getMetricStatisticsAsync(request, new AsyncHandler<GetMetricStatisticsRequest, GetMetricStatisticsResult>() { 
             
            @Override 
            public void onSuccess(GetMetricStatisticsRequest arg0,
                    GetMetricStatisticsResult arg1) { 
                List<Datapoint> data = arg1.getDatapoints(); 
                Double avg = data.size() > 0 ? data.get(0).getAverage() : 0.0; 
                Double min = data.size() > 0 ? data.get(0).getMinimum() : 0.0; 
                Double max = data.size() > 0 ? data.get(0).getMaximum() : 0.0; 
                 
            } 
             
            @Override 
            public void onError(Exception arg0) {
            } 
        }); 
        return; 
    } 
     
    public static void get5MinDiskWriteOps(AmazonCloudWatchAsyncClient client, final JSONObject groupDetails, final String clientName){ 
        client.setEndpoint(groupDetails.getString("END_POINT")); 
        GetMetricStatisticsRequest request = initializeRequestObject(client, groupDetails); 
         
        request.setMetricName("DiskWriteOps"); 
        request.setUnit(StandardUnit.Count); 
         
        List<String> stats = new ArrayList<String>(); 
        stats.add("Average"); 
        stats.add("Maximum"); 
        stats.add("Minimum"); 
        request.setStatistics(stats); 
         
        client.getMetricStatisticsAsync(request, new AsyncHandler<GetMetricStatisticsRequest, GetMetricStatisticsResult>() { 
             
            @Override 
            public void onSuccess(GetMetricStatisticsRequest arg0,
                    GetMetricStatisticsResult arg1) { 
                List<Datapoint> data = arg1.getDatapoints(); 
                Double avg = data.size() > 0 ? data.get(0).getAverage() : 0.0; 
                Double min = data.size() > 0 ? data.get(0).getMinimum() : 0.0; 
                Double max = data.size() > 0 ? data.get(0).getMaximum() : 0.0; 
                 
            } 
             
            @Override 
            public void onError(Exception arg0) {
            } 
        }); 
        return; 
    } 
     
    public static void get5MinNetworkOutBytes(AmazonCloudWatchAsyncClient client, final JSONObject groupDetails, final String clientName){ 
        client.setEndpoint(groupDetails.getString("END_POINT")); 
        GetMetricStatisticsRequest request = initializeRequestObject(client, groupDetails); 
         
        request.setMetricName("NetworkOut"); 
        request.setUnit(StandardUnit.Bytes); 
         
        List<String> stats = new ArrayList<String>(); 
        stats.add("Average"); 
        stats.add("Maximum"); 
        stats.add("Minimum"); 
        request.setStatistics(stats); 
         
        client.getMetricStatisticsAsync(request, new AsyncHandler<GetMetricStatisticsRequest, GetMetricStatisticsResult>() { 
             
            @Override 
            public void onSuccess(GetMetricStatisticsRequest arg0,
                    GetMetricStatisticsResult arg1) { 
                List<Datapoint> data = arg1.getDatapoints(); 
                Double avg = data.size() > 0 ? data.get(0).getAverage() : 0.0; 
                Double min = data.size() > 0 ? data.get(0).getMinimum() : 0.0; 
                Double max = data.size() > 0 ? data.get(0).getMaximum() : 0.0; 
                 
            } 
             
            @Override 
            public void onError(Exception arg0) {
            } 
        }); 
        return; 
    } 
     
    public static void get5MinNetworkInBytes(AmazonCloudWatchAsyncClient client, final JSONObject groupDetails, final String clientName){ 
        client.setEndpoint(groupDetails.getString("END_POINT")); 
        GetMetricStatisticsRequest request = initializeRequestObject(client, groupDetails); 
         
        request.setMetricName("NetworkIn"); 
        request.setUnit(StandardUnit.Bytes); 
         
        List<String> stats = new ArrayList<String>(); 
        stats.add("Average"); 
        stats.add("Maximum"); 
        stats.add("Minimum"); 
        request.setStatistics(stats); 
         
        client.getMetricStatisticsAsync(request, new AsyncHandler<GetMetricStatisticsRequest, GetMetricStatisticsResult>() { 
             
            @Override 
            public void onSuccess(GetMetricStatisticsRequest arg0,
                    GetMetricStatisticsResult arg1) { 
                List<Datapoint> data = arg1.getDatapoints(); 
                Double avg = data.size() > 0 ? data.get(0).getAverage() : 0.0; 
                Double min = data.size() > 0 ? data.get(0).getMinimum() : 0.0; 
                Double max = data.size() > 0 ? data.get(0).getMaximum() : 0.0; 
                 
            } 
             
            @Override 
            public void onError(Exception arg0) {
                log.error("Could not get Autoscaling data for " + groupDetails.getString("NAME") + " for client "+ clientName,arg0); 
                NotificationMail.sendMail("Could not get Autoscaling data for " + groupDetails.getString("NAME") + " for client "+ clientName, "AutoScaling data could not be read"); 
            } 
        }); 
        return; 
    } 

For some more examples (ELB and RDS metrics) go here