JmxMonRESTgetMetrics.java
4.44 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.management.remote.JMXServiceURL;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import se.lil.jm.JmxMon;
import se.lil.jm.Registry;
/**
* Servlet implementation class JmxMonRESTgetMetrics
*/
@WebServlet(description = "Gets JMX Monitors metrics", urlPatterns = { "/JmxMonREST/getMetrics" })
public class JmxMonRESTgetMetrics extends HttpServlet {
private static final long serialVersionUID = 1L;
private final static Logger LOGGER = Logger.getLogger(JmxMonRESTgetMetrics.class.getName());
/**
* @see HttpServlet#HttpServlet()
*/
public JmxMonRESTgetMetrics() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("application/json");
try {
StringBuffer sb = new StringBuffer();
JmxMon mon = null;
if(request.getParameterMap().containsKey("connectionString")) {
// Check that we have a valid connection string
JMXServiceURL url;
try {
url = new JMXServiceURL(request.getParameter("connectionString"));
} catch (Exception e) {
// Error, we need a correct connection string
response.setStatus(400);
response.getWriter().println("{\"error\":true,\"msg\":\"connectionString is not a correct JMX Service URL\"}");
return;
}
// Try to find the monitor in our list
for (JmxMon item : Registry.getList()) {
if(item.getConString().equals(url.toString())) {
mon = item;
}
}
// If not found return error
if(mon == null) {
// Not found, create it
response.setStatus(HttpServletResponse.SC_NOT_FOUND);
response.getWriter().println("{\"error\":true,\"msg\":\"Can not find a monitor with connection string "+url.toString()+"\"}");
return;
}
}
// Loop over all monitors and output a Json array with the default set of metrics
sb.append("{\"name\":\"" + mon.getServerName() + "\",\"error\":false,\"nvarray\":");
sb.append("[");
sb.append("{\"name\":\"Process CPU Used %\",\"value\":" + mon.getCPUPercent() + "}");
sb.append(",{\"name\":\"Process Heap Used %\",\"value\":" + mon.getHeapUsedPercent() + "}");
sb.append(",{\"name\":\"OldGen Used %\",\"value\":" + mon.getOldGenUsedPercent() + "}");
sb.append(",{\"name\":\"GC Time (Overhead) %\",\"value\":" + mon.getGCOverhead() + "}");
sb.append(",{\"name\":\"Process File Descriptors %\",\"value\":" + mon.getSystemFileDescriptorsPercentUsed() + "}");
sb.append(",{\"name\":\"System Memory %\",\"value\":" + mon.getSystemMemoryPercentUsed() + "}");
sb.append(",{\"name\":\"System Swap %\",\"value\":" + mon.getSystemSwapPercentUsed() + "}");
sb.append(",{\"name\":\"Process Threads #\",\"value\":" + mon.getThreads() + "}");
sb.append(",{\"name\":\"Process Loaded Classes #\",\"value\":" + mon.getLoadedClassCount() + "}");
sb.append(",{\"name\":\"Process Heap Committed MB\",\"value\":" + mon.getHeapCommittedMB() + "}");
sb.append(",{\"name\":\"Process Heap Used MB\",\"value\":" + mon.getHeapUsedMB() + "}");
sb.append(",{\"name\":\"OldGen Used MB\",\"value\":" + mon.getOldGenUsedMB() + "}");
sb.append(",{\"name\":\"OldGen After Last GC MB\",\"value\":" + mon.getOldGenAfterGCMB() + "}");
sb.append(",{\"name\":\"PermGen After Last GC MB\",\"value\":" + mon.getPermGenAfterGCMB() + "}");
sb.append(",{\"name\":\"System Load (per cpu)\",\"value\":" + mon.getAverageLoadPerCpu() + "}");
sb.append(",{\"name\":\"System Load (total)\",\"value\":" + mon.getAverageLoad() + "}");
sb.append(",{\"name\":\"Number of processors #\",\"value\":" + mon.getNumberOfCPUs() + "}");
sb.append("]}");
response.getWriter().println(sb.toString());
} catch (Throwable e) {
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
response.getWriter().println("{\"error\":true,\"msg\":\""+e.toString().replace("\n"," ").trim()+"\"}");
LOGGER.log(Level.SEVERE, e.toString());
e.printStackTrace();
}
}
}