コード例 #1
0
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;
  }
}
コード例 #2
0
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() + "]";
  }
}