public class ActiveManagementCoordinator implements ManagementCoordinator {
public static final String C3P0_REGISTRY_NAME_KEY = "com.mchange.v2.c3p0.management.RegistryName";
private static final String C3P0_REGISTRY_NAME_PFX = "com.mchange.v2.c3p0:type=C3P0Registry";
public static final String EXCLUDE_IDENTITY_TOKEN_KEY =
"com.mchange.v2.c3p0.management.ExcludeIdentityToken";
// MT: thread-safe
static final MLogger logger = MLog.getLogger(ActiveManagementCoordinator.class);
static final boolean EXCLUDE_IDENTITY_TOKEN;
static {
String excludeStr =
C3P0Config.getMultiPropertiesConfig().getProperty(EXCLUDE_IDENTITY_TOKEN_KEY);
if (excludeStr == null) EXCLUDE_IDENTITY_TOKEN = false;
else EXCLUDE_IDENTITY_TOKEN = Boolean.parseBoolean(excludeStr.trim().toLowerCase());
if (EXCLUDE_IDENTITY_TOKEN)
logger.info(
EXCLUDE_IDENTITY_TOKEN_KEY
+ " set to true; please ensure unique dataSourceName values are set for all PooledDataSources.");
}
final MBeanServer mbs;
final String regName;
public ActiveManagementCoordinator() throws Exception {
this.mbs = ManagementFactory.getPlatformMBeanServer();
this.regName = getRegistryName();
}
public void attemptManageC3P0Registry() {
try {
ObjectName name = new ObjectName(regName);
C3P0RegistryManager mbean = new C3P0RegistryManager();
if (mbs.isRegistered(name)) {
if (logger.isLoggable(MLevel.WARNING)) {
logger.warning(
"A C3P0Registry mbean is already registered. "
+ "This probably means that an application using c3p0 was undeployed, "
+ "but not all PooledDataSources were closed prior to undeployment. "
+ "This may lead to resource leaks over time. Please take care to close "
+ "all PooledDataSources.");
}
mbs.unregisterMBean(name);
}
mbs.registerMBean(mbean, name);
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"Failed to set up C3P0RegistryManager mBean. "
+ "[c3p0 will still function normally, but management via JMX may not be possible.]",
e);
}
}
public void attemptUnmanageC3P0Registry() {
try {
ObjectName name = new ObjectName(regName);
if (mbs.isRegistered(name)) {
mbs.unregisterMBean(name);
if (logger.isLoggable(MLevel.FINER))
logger.log(MLevel.FINER, "C3P0Registry mbean unregistered.");
} else if (logger.isLoggable(MLevel.FINE))
logger.fine(
"The C3P0Registry mbean was not found in the registry, so could not be unregistered.");
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"An Exception occurred while trying to unregister the C3P0RegistryManager mBean." + e);
}
}
public void attemptManagePooledDataSource(PooledDataSource pds) {
String name = null;
try {
name = getPdsObjectNameStr(pds);
ObjectName oname = new ObjectName(name);
if (mbs.isRegistered(oname)) {
if (logger.isLoggable(MLevel.WARNING))
logger.warning(
"You are attempting to register an mbean '"
+ name
+ "', but an mbean by that name is already registered. "
+ "The new mbean will replace the old one in the MBean server. "
+ (EXCLUDE_IDENTITY_TOKEN
? "Since you have excluded the guaranteed-unique identity token, you must take care to give each PooledDataSource a unique dataSourceName."
: "This should not happen unless you have (pathologically) modified the DataSource's guaranteed-unique identityToken."));
}
// PooledDataSourceManager mbean = new PooledDataSourceManager( pds );
// mbs.registerMBean(mbean, ObjectName.getInstance(name));
// if (logger.isLoggable(MLevel.FINER))
// logger.log(MLevel.FINER, "MBean: " + name + " registered.");
// DynamicPooledDataSourceManagerMBean registers itself on construction (and logs its own
// registration)
DynamicPooledDataSourceManagerMBean mbean =
new DynamicPooledDataSourceManagerMBean(pds, name, mbs);
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"Failed to set up a PooledDataSourceManager mBean. [ "
+ (name == null ? pds.toString() : name)
+ " ] c3p0 will still function normally, but management of this DataSource by JMX may not be possible.",
e);
}
}
public void attemptUnmanagePooledDataSource(PooledDataSource pds) {
String nameStr = null;
try {
nameStr = getPdsObjectNameStr(pds);
ObjectName name = new ObjectName(nameStr);
if (mbs.isRegistered(name)) {
mbs.unregisterMBean(name);
if (logger.isLoggable(MLevel.FINE))
logger.log(MLevel.FINE, "MBean: " + nameStr + " unregistered.");
} else if (logger.isLoggable(MLevel.FINE))
logger.fine(
"The mbean "
+ nameStr
+ " was not found in the registry, so could not be unregistered.");
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"An Exception occurred while unregistering mBean. ["
+ (nameStr == null ? pds.toString() : nameStr)
+ "] ",
e);
}
}
static String getPdsObjectNameStr(PooledDataSource pds) {
String dataSourceName = pds.getDataSourceName();
// if we are excluding the identity token attribute, then we always need a valid name attribute.
// hopefully users who set EXCLUDE_IDENTITY_TOKEN will update dataSourceName to a reasonable
// value.
// in the meantime, we use the identity token value for the name.
//
// but note that at present, pds.getDataSourceName() returns the identity token when
// dataSourceName
// is unset or set to null. So, this predicate is unlikely ever to be true.
if (dataSourceName == null && EXCLUDE_IDENTITY_TOKEN) dataSourceName = pds.getIdentityToken();
// when EXCLUDE_IDENTITY_TOKEN is false, in practice we nearly always generate a 3-attribute
// name (type, identityToken, name), because even when dataSourceName is not set or set to null,
// getDataSourceName() returns the identity token rather than null.
//
// when EXCLUDE_IDENTITY_TOKEN is true, we reliably generate a two-attribute name.
StringBuilder sb = new StringBuilder(256);
sb.append("com.mchange.v2.c3p0:type=PooledDataSource");
if (!EXCLUDE_IDENTITY_TOKEN) {
sb.append(",identityToken=");
sb.append(pds.getIdentityToken());
}
if (dataSourceName != null) {
sb.append(",name=");
sb.append(dataSourceName);
}
return sb.toString();
// String out = "com.mchange.v2.c3p0:type=PooledDataSource,identityToken=" +
// pds.getIdentityToken();
// if ( dataSourceName != null )
// out += ",name=" + dataSourceName;
// return out;
}
private static String getRegistryName() {
String name = C3P0Config.getMultiPropertiesConfig().getProperty(C3P0_REGISTRY_NAME_KEY);
if (name == null) name = C3P0_REGISTRY_NAME_PFX; // a name property is optional
else name = C3P0_REGISTRY_NAME_PFX + ",name=" + name;
return name;
}
}
public class ActiveManagementCoordinator implements ManagementCoordinator {
private static final String C3P0_REGISTRY_NAME = "com.mchange.v2.c3p0:type=C3P0Registry";
// MT: thread-safe
static final MLogger logger = MLog.getLogger(ActiveManagementCoordinator.class);
MBeanServer mbs;
public ActiveManagementCoordinator() throws Exception {
this.mbs = ManagementFactory.getPlatformMBeanServer();
}
public void attemptManageC3P0Registry() {
try {
ObjectName name = new ObjectName(C3P0_REGISTRY_NAME);
C3P0RegistryManager mbean = new C3P0RegistryManager();
if (mbs.isRegistered(name)) {
if (logger.isLoggable(MLevel.WARNING)) {
logger.warning(
"A C3P0Registry mbean is already registered. "
+ "This probably means that an application using c3p0 was undeployed, "
+ "but not all PooledDataSources were closed prior to undeployment. "
+ "This may lead to resource leaks over time. Please take care to close "
+ "all PooledDataSources.");
}
mbs.unregisterMBean(name);
}
mbs.registerMBean(mbean, name);
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"Failed to set up C3P0RegistryManager mBean. "
+ "[c3p0 will still function normally, but management via JMX may not be possible.]",
e);
}
}
public void attemptUnmanageC3P0Registry() {
try {
ObjectName name = new ObjectName(C3P0_REGISTRY_NAME);
if (mbs.isRegistered(name)) {
mbs.unregisterMBean(name);
if (logger.isLoggable(MLevel.FINER))
logger.log(MLevel.FINER, "C3P0Registry mbean unregistered.");
} else if (logger.isLoggable(MLevel.FINE))
logger.fine(
"The C3P0Registry mbean was not found in the registry, so could not be unregistered.");
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"An Exception occurred while trying to unregister the C3P0RegistryManager mBean." + e);
}
}
public void attemptManagePooledDataSource(PooledDataSource pds) {
String name = getPdsObjectNameStr(pds);
try {
// PooledDataSourceManager mbean = new PooledDataSourceManager( pds );
// mbs.registerMBean(mbean, ObjectName.getInstance(name));
// if (logger.isLoggable(MLevel.FINER))
// logger.log(MLevel.FINER, "MBean: " + name + " registered.");
// DynamicPooledDataSourceManagerMBean registers itself on construction (and logs its own
// registration)
DynamicPooledDataSourceManagerMBean mbean =
new DynamicPooledDataSourceManagerMBean(pds, name, mbs);
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"Failed to set up a PooledDataSourceManager mBean. ["
+ name
+ "] "
+ "[c3p0 will still functioning normally, but management via JMX may not be possible.]",
e);
}
}
public void attemptUnmanagePooledDataSource(PooledDataSource pds) {
String nameStr = getPdsObjectNameStr(pds);
try {
ObjectName name = new ObjectName(nameStr);
if (mbs.isRegistered(name)) {
mbs.unregisterMBean(name);
if (logger.isLoggable(MLevel.FINER))
logger.log(MLevel.FINER, "MBean: " + nameStr + " unregistered.");
} else if (logger.isLoggable(MLevel.FINE))
logger.fine(
"The mbean "
+ nameStr
+ " was not found in the registry, so could not be unregistered.");
} catch (Exception e) {
if (logger.isLoggable(MLevel.WARNING))
logger.log(
MLevel.WARNING,
"An Exception occurred while unregistering mBean. [" + nameStr + "] " + e);
}
}
private String getPdsObjectNameStr(PooledDataSource pds) {
return "com.mchange.v2.c3p0:type=PooledDataSource[" + pds.getIdentityToken() + "]";
}
}