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package com.sun.gjc.util;
import com.sun.gjc.monitoring.JdbcRAConstants;
import com.sun.gjc.monitoring.SQLTraceProbeProvider;
import java.util.ArrayList;
import java.util.List;
import org.glassfish.api.jdbc.SQLTraceListener;
import org.glassfish.api.jdbc.SQLTraceRecord;
/**
* Implementation of SQLTraceListener to listen to events related to a
* sql record tracing. The registry allows multiple listeners
* to listen to the sql tracing events. Maintains a list of listeners.
*
* @author Shalini M
*/
//@Scoped(Singleton.class)
public class SQLTraceDelegator implements SQLTraceListener {
//List of listeners
protected List<SQLTraceListener> sqlTraceListenersList;
private String poolName;
private String appName;
private String moduleName;
private SQLTraceProbeProvider probeProvider = null;
public SQLTraceProbeProvider getProbeProvider() {
return probeProvider;
}
public SQLTraceDelegator(String poolName, String appName, String moduleName) {
this.poolName = poolName;
this.appName = appName;
this.moduleName = moduleName;
probeProvider = new SQLTraceProbeProvider();
}
/**
* Add a listener to the list of sql trace listeners maintained by
* this registry.
* @param listener
*/
public void registerSQLTraceListener(SQLTraceListener listener) {
if(sqlTraceListenersList == null) {
sqlTraceListenersList = new ArrayList<SQLTraceListener>();
}
sqlTraceListenersList.add(listener);
}
public void sqlTrace(SQLTraceRecord record) {
if (sqlTraceListenersList != null) {
for (SQLTraceListener listener : sqlTraceListenersList) {
listener.sqlTrace(record);
}
}
if (record != null) {
record.setPoolName(poolName);
String methodName = record.getMethodName();
//Check if the method name is one in which sql query is used
if (isMethodValidForCaching(methodName)) {
Object[] params = record.getParams();
if (params != null && params.length > 0) {
String sqlQuery = null;
for (Object param : params) {
if(param instanceof String) {
sqlQuery = param.toString();
}
break;
}
if (sqlQuery != null) {
probeProvider.traceSQLEvent(poolName, appName, moduleName, sqlQuery);
}
}
}
}
}
/**
* Check if the method name from the sql trace record can be used to
* retrieve a sql string for caching purpose. Most of the method names do not
* contain a sql string and hence are unusable for caching the sql strings.
* These method names are filtered in this method.
*
* @param methodName
* @return true if method name can be used to get a sql string for caching.
*/
private boolean isMethodValidForCaching(String methodName) {
return JdbcRAConstants.validSqlTracingMethodNames.contains(methodName);
}
}