use of org.apache.commons.jexl2.ReadonlyContext in project opennms by OpenNMS.
the class JMXMonitor method poll.
/**
* {@inheritDoc}
*/
@Override
public PollStatus poll(MonitoredService svc, Map<String, Object> map) {
final InetAddress ipv4Addr = svc.getAddress();
PollStatus serviceStatus = PollStatus.unavailable();
try {
final Timer timer = new Timer();
final JmxConnectionManager connectionManager = new DefaultConnectionManager(ParameterMap.getKeyedInteger(map, "retry", 3));
final JmxConnectionManager.RetryCallback retryCallback = new JmxConnectionManager.RetryCallback() {
@Override
public void onRetry() {
timer.reset();
}
};
try (JmxServerConnectionWrapper connection = connectionManager.connect(getConnectionName(), ipv4Addr, JmxUtils.convertToStringMap(map), retryCallback)) {
// Start with simple communication
connection.getMBeanServerConnection().getMBeanCount();
// Take time just here to get not influenced by test execution
// time
final long nanoResponseTime = System.nanoTime() - timer.getStartTime();
// Find all variable definitions
final Map<String, Object> variables = Maps.newHashMap();
for (final String key : map.keySet()) {
// Skip fast if it does not start with the prefix
if (!key.startsWith(PARAM_BEAN_PREFIX)) {
continue;
}
// Get the variable name
final String variable = key.substring(PARAM_BEAN_PREFIX.length());
// Get the variable definition
final String definition = ParameterMap.getKeyedString(map, key, null);
// Store wrapper for variable definition
variables.put(variable, ObjectNameWrapper.create(connection.getMBeanServerConnection(), definition));
}
// Find all test definitions
final Map<String, Expression> tests = Maps.newHashMap();
for (final String key : map.keySet()) {
// Skip fast if it does not start with the prefix
if (!key.startsWith(PARAM_TEST_PREFIX)) {
continue;
}
// Get the test name
final String variable = key.substring(PARAM_TEST_PREFIX.length());
// Get the test definition
final String definition = ParameterMap.getKeyedString(map, key, null);
// Build the expression from the definition
final Expression expression = JEXL_ENGINE.createExpression(definition);
// Store expressions
tests.put(variable, expression);
}
// Also handle a single test
if (map.containsKey(PARAM_TEST)) {
// Get the test definition
final String definition = ParameterMap.getKeyedString(map, PARAM_TEST, null);
// Build the expression from the definition
final Expression expression = JEXL_ENGINE.createExpression(definition);
// Store expressions
tests.put(null, expression);
}
// Build the context for all tests
final JexlContext context = new ReadonlyContext(new MapContext(variables));
serviceStatus = PollStatus.up(nanoResponseTime / 1000000.0);
// Execute all tests
for (final Map.Entry<String, Expression> e : tests.entrySet()) {
if (!(boolean) e.getValue().evaluate(context)) {
serviceStatus = PollStatus.down("Test failed: " + e.getKey());
break;
}
}
} catch (JmxServerConnectionException mbse) {
// Number of retries exceeded
String reason = "IOException while polling address: " + ipv4Addr;
LOG.debug(reason);
serviceStatus = PollStatus.unavailable(reason);
}
} catch (Throwable e) {
String reason = "Monitor - failed! " + InetAddressUtils.str(ipv4Addr);
LOG.debug(reason);
serviceStatus = PollStatus.unavailable(reason);
}
return serviceStatus;
}
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