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package oracle.toplink.essentials.threetier;
import java.util.*;
import oracle.toplink.essentials.internal.databaseaccess.*;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.sessions.DatasourceLogin;
import oracle.toplink.essentials.sessions.Login;
import oracle.toplink.essentials.sessions.UnitOfWork;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.sequencing.SequencingCallback;
import oracle.toplink.essentials.internal.sequencing.SequencingServer;
import oracle.toplink.essentials.logging.SessionLog;
import oracle.toplink.essentials.internal.sessions.*;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* Implementation of Server
* INTERNAL:
* The public interface should be used.
* <p>
* <b>Purpose</b>: A single session that supports multiple user/clients connection at the same time.
* <p>
* <b>Description</b>: This session supports a shared session that can be used by multiple users
* or clients in a three-tiered application. It brokers client sessions to allow read and write access
* through a unified object cache. The server session provides a shared read only database connection that
* is used by all of its client for reads. All changes to objects and the database must be done through
* a unit of work acquired from the client session, this allows the changes to occur in a transactional object
* space and under a exclusive database connection.
* <p>
* <b>Responsibilities</b>:
* <ul>
* <li> Connecting/disconnecting the default reading login.
* <li> Reading objects and maintaining the object cache.
* <li> Brokering client sessions.
* <li> Disabling database modification through the shared connection.
* </ul>
* @see ClientSession
* @see UnitOfWork
*/
public class ServerSession extends DatabaseSessionImpl implements Server {
protected ConnectionPool readConnectionPool;
protected Map connectionPools;
protected ConnectionPolicy defaultConnectionPolicy;
protected int maxNumberOfNonPooledConnections;
protected int numberOfNonPooledConnectionsUsed;
public static final int MAX_WRITE_CONNECTIONS = 10;
public static final int MIN_WRITE_CONNECTIONS = 5;
/**
* INTERNAL:
* Create and return a new default server session.
* Used for EJB SessionManager to instantiate a server session
*/
public ServerSession() {
super();
this.connectionPools = new HashMap(10);
}
/**
* PUBLIC:
* Create and return a new server session.
* By giving the login information on creation this allows the session to initialize itself
* to the platform given in the login. This constructor does not return a connected session.
* To connect the session to the database login() must be sent to it. The login(userName, password)
* method may also be used to connect the session, this allows for the user name and password
* to be given at login but for the other database information to be provided when the session is created.
* By default the server session uses a default connection pool with 5 min 10 max number of connections
* and a max number 50 non-pooled connections allowed.
*/
public ServerSession(Login login) {
this(new oracle.toplink.essentials.sessions.Project(login));
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the min and max number of connections for the default pool.
*/
public ServerSession(Login login, int minNumberOfPooledConnection, int maxNumberOfPooledConnection) {
this(new oracle.toplink.essentials.sessions.Project(login), minNumberOfPooledConnection, maxNumberOfPooledConnection);
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the default connection policy to be used.
* This policy is used on the "acquireClientSession()" protocol.
*/
public ServerSession(Login login, ConnectionPolicy defaultConnectionPolicy) {
this(new oracle.toplink.essentials.sessions.Project(login), defaultConnectionPolicy);
}
/**
* PUBLIC:
* Create and return a new server session.
* By giving the project information on creation this allows the session to initialize itself
* to the platform given in the login. This constructor does not return a connected session.
* To connect the session to the database login() must be sent to it. The login(userName, password)
* method may also be used to connect the session, this allows for the user name and password
* to be given at login but for the other database information to be provided when the session is created.
* By default the server session uses a default connection pool with 5 min 10 max number of connections
* and a max number 50 non-pooled connections allowed.
*/
public ServerSession(oracle.toplink.essentials.sessions.Project project) {
this(project, MIN_WRITE_CONNECTIONS, MAX_WRITE_CONNECTIONS);
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the min and max number of connections for the default pool.
*/
public ServerSession(oracle.toplink.essentials.sessions.Project project, int minNumberOfPooledConnection, int maxNumberOfPooledConnection) {
this(project, new ConnectionPolicy("default"));
ConnectionPool pool = null;
if (project.getDatasourceLogin().shouldUseExternalConnectionPooling()) {
pool = new ExternalConnectionPool("default", project.getDatasourceLogin(), this);
} else {
pool = new ConnectionPool("default", project.getDatasourceLogin(), minNumberOfPooledConnection, maxNumberOfPooledConnection, this);
}
this.connectionPools.put("default", pool);
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the min and max number of connections for the default pool.
* Use the login from the project for the write pool. Use the passed
* in login for the read pool, if specified, or the project login if not.
*
* @param project the project associated with this session
* @param minNumberOfPooledConnection the minimum number of connections in the pool
* @param maxNumberOfPooledConnection the maximum number of connections in the pool
* @param readLogin the login used to create the read connection pool
*/
public ServerSession(oracle.toplink.essentials.sessions.Project project, int minNumberOfPooledConnection, int maxNumberOfPooledConnection, oracle.toplink.essentials.sessions.Login readLogin) {
this(project, new ConnectionPolicy("default"), readLogin);
ConnectionPool pool = null;
if (project.getDatasourceLogin().shouldUseExternalConnectionPooling()) {
pool = new ExternalConnectionPool("default", project.getDatasourceLogin(), this);
} else {
pool = new ConnectionPool("default", project.getDatasourceLogin(), minNumberOfPooledConnection, maxNumberOfPooledConnection, this);
}
this.connectionPools.put("default", pool);
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the min and max number of connections for the default pool.
* Use the login from the project for the write pool. Use the passed
* in login for the read pool, if specified, or the project login if not.
* Use the sequenceLogin, if specified, for creating a connection pool
* to be used by sequencing through SequencingConnectionHandler
* sequenceLogin *MUST*:
* 1. specify *NON-JTS* connections (such as NON_JTS driver or read-only datasource);
* 2. sequenceLogin.shouldUseExternalTransactionController()==false
*
* @param project the project associated with this session
* @param minNumberOfPooledConnection the minimum number of connections in the pool
* @param maxNumberOfPooledConnection the maximum number of connections in the pool
* @param readLogin the login used to create the read connection pool
* @param sequenceLogin the login used to create a connection pool for sequencing
*/
public ServerSession(oracle.toplink.essentials.sessions.Project project, int minNumberOfPooledConnection, int maxNumberOfPooledConnection, oracle.toplink.essentials.sessions.Login readLogin, oracle.toplink.essentials.sessions.Login sequenceLogin) {
this(project, new ConnectionPolicy("default"), readLogin, sequenceLogin);
ConnectionPool pool = null;
if (project.getDatasourceLogin().shouldUseExternalConnectionPooling()) {
pool = new ExternalConnectionPool("default", project.getDatasourceLogin(), this);
} else {
pool = new ConnectionPool("default", project.getDatasourceLogin(), minNumberOfPooledConnection, maxNumberOfPooledConnection, this);
}
this.connectionPools.put("default", pool);
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the default connection policy to be used.
* This policy is used on the "acquireClientSession()" protocol.
*/
public ServerSession(oracle.toplink.essentials.sessions.Project project, ConnectionPolicy defaultConnectionPolicy) {
super(project);
this.connectionPools = new HashMap(10);
this.defaultConnectionPolicy = defaultConnectionPolicy;
this.maxNumberOfNonPooledConnections = 50;
this.numberOfNonPooledConnectionsUsed = 0;
setReadConnectionPool(project.getDatasourceLogin());
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the default connection policy to be used.
* This policy is used on the "acquireClientSession()" protocol.
* Use the readLogin, if specified, for logging into the read
* connection pool.
*/
public ServerSession(oracle.toplink.essentials.sessions.Project project, ConnectionPolicy defaultConnectionPolicy, oracle.toplink.essentials.sessions.Login readLogin) {
super(project);
this.connectionPools = new HashMap(10);
this.defaultConnectionPolicy = defaultConnectionPolicy;
this.maxNumberOfNonPooledConnections = 50;
this.numberOfNonPooledConnectionsUsed = 0;
Login login = (readLogin != null) ? readLogin : project.getDatasourceLogin();
setReadConnectionPool(login);
}
/**
* PUBLIC:
* Create and return a new server session.
* Configure the default connection policy to be used.
* This policy is used on the "acquireClientSession()" protocol.
* Use the readLogin, if specified, for logging into the read
* connection pool.
* Use the sequenceLogin, if specified, for creating a connection pool
* to be used by sequencing through SequencingConnectionHandler
* sequenceLogin *MUST*:
* 1. specify *NON-JTS* connections (such as NON_JTS driver or read-only datasource);
* 2. sequenceLogin.shouldUseExternalTransactionController()==false
*
*/
public ServerSession(oracle.toplink.essentials.sessions.Project project, ConnectionPolicy defaultConnectionPolicy, oracle.toplink.essentials.sessions.Login readLogin, oracle.toplink.essentials.sessions.Login sequenceLogin) {
this(project, defaultConnectionPolicy, readLogin);
if (sequenceLogin != null) {
//** sequencing refactoring
getSequencingControl().setShouldUseSeparateConnection(true);
getSequencingControl().setLogin(sequenceLogin);
}
}
/**
* INTERNAL:
* Allocate the client's connection resource.
*/
public void acquireClientConnection(ClientSession clientSession) throws DatabaseException, ConcurrencyException {
if (clientSession.getConnectionPolicy().isPooled()) {
ConnectionPool pool = (ConnectionPool)getConnectionPools().get(clientSession.getConnectionPolicy().getPoolName());
Accessor connection = pool.acquireConnection();
clientSession.setWriteConnection(connection);
getEventManager().postAcquireConnection(connection);
} else {
// This method is synchronized, so while is not required, only if.
synchronized (this) {
while (getNumberOfNonPooledConnectionsUsed() >= getMaxNumberOfNonPooledConnections()) {
try {
wait();// Notify is called when connections are released.
} catch (InterruptedException exception) {
throw ConcurrencyException.waitFailureOnServerSession(exception);
}
}
setNumberOfNonPooledConnectionsUsed(getNumberOfNonPooledConnectionsUsed() + 1);
clientSession.setWriteConnection(clientSession.getLogin().buildAccessor());
clientSession.connect();
}
}
}
/**
* PUBLIC:
* Return a client session for this server session.
* Each user/client connected to this server session must acquire there own client session
* to communicate to the server through.
* This method allows for a client session to be acquired sharing the same login as the server session.
*/
public ClientSession acquireClientSession() throws DatabaseException {
return acquireClientSession((ConnectionPolicy)getDefaultConnectionPolicy().clone());
}
/**
* PUBLIC:
* Return a client session for this server session.
* Each user/client connected to this server session must acquire there own client session
* to communicate to the server through.
* This method allows for a client session to be acquired sharing its connection from a pool
* of connection allocated on the server session.
* By default this uses a lazy connection policy.
*/
public ClientSession acquireClientSession(String poolName) throws DatabaseException {
return acquireClientSession(new ConnectionPolicy(poolName));
}
/**
* PUBLIC:
* Return a client session for this server session.
* Each user/client connected to this server session must acquire there own client session
* to communicate to the server through.
* The client must provide its own login to use, and the client session returned
* will have its own exclusive database connection. This connection will be used to perform
* all database modification for all units of work acquired from the client session.
* By default this does not use a lazy connection policy.
*/
public ClientSession acquireClientSession(Login login) throws DatabaseException {
return acquireClientSession(new ConnectionPolicy(login));
}
/**
* PUBLIC:
* Return a client session for this server session.
* The connection policy specifies how the client session's connection will be acquired.
*/
public ClientSession acquireClientSession(ConnectionPolicy connectionPolicy) throws DatabaseException, ValidationException {
if (!isConnected()) {
throw ValidationException.loginBeforeAllocatingClientSessions();
}
log(SessionLog.FINER, SessionLog.CONNECTION, "client_acquired");
if (!connectionPolicy.isPooled() && (connectionPolicy.getLogin() == null)) {
//the user has passed in a connection policy with no login info. Use the
//default info from the default connection policy
connectionPolicy.setPoolName(getDefaultConnectionPolicy().getPoolName());
connectionPolicy.setLogin(getDefaultConnectionPolicy().getLogin());
}
if (connectionPolicy.isPooled()) {
ConnectionPool pool = (ConnectionPool)getConnectionPools().get(connectionPolicy.getPoolName());
if (pool == null) {
throw ValidationException.poolNameDoesNotExist(connectionPolicy.getPoolName());
}
connectionPolicy.setLogin((Login)pool.getLogin().clone());
}
ClientSession client = null;
if (getProject().hasIsolatedClasses()) {
client = new IsolatedClientSession(this, connectionPolicy);
} else {
client = new ClientSession(this, connectionPolicy);
}
if (!connectionPolicy.isLazy()) {
acquireClientConnection(client);
}
return client;
}
/**
* PUBLIC:
* Return a unit of work for this session.
* The unit of work is an object level transaction that allows
* a group of changes to be applied as a unit.
* First acquire a client session as server session does not allow direct units of work.
*
* @see UnitOfWork
*/
public UnitOfWork acquireUnitOfWork() {
return acquireClientSession().acquireUnitOfWork();
}
/**
* PUBLIC:
* Add the connection pool.
* Connections are pooled to share and restrict the number of database connections.
*/
public void addConnectionPool(String poolName, Login login, int minNumberOfConnections, int maxNumberOfConnections) throws ValidationException {
if (minNumberOfConnections > maxNumberOfConnections) {
throw ValidationException.maxSizeLessThanMinSize();
}
if (isConnected()) {
throw ValidationException.poolsMustBeConfiguredBeforeLogin();
}
ConnectionPool pool = null;
if (login.shouldUseExternalConnectionPooling()) {
pool = new ExternalConnectionPool(poolName, login, this);
} else {
pool = new ConnectionPool(poolName, login, minNumberOfConnections, maxNumberOfConnections, this);
}
addConnectionPool(pool);
}
/**
* PUBLIC:
* Connection are pooled to share and restrict the number of database connections.
*/
public void addConnectionPool(ConnectionPool pool) {
pool.setOwner(this);
getConnectionPools().put(pool.getName(), pool);
}
/**
* INTERNAL:
* Called after transaction is completed (committed or rolled back)
*/
public void afterTransaction(boolean committed, boolean isExternalTransaction, Accessor accessor) {
SequencingCallback callback = getSequencingHome().getSequencingCallback();
if (callback != null) {
callback.afterTransaction(accessor, committed);
}
}
/**
* INTERNAL:
* Return a read connection from the read pool.
* Note that depending on the type of pool this may be a shared or exclusive connection.
* Each query execution is assigned a read connection.
*/
public Accessor allocateReadConnection() {
Accessor connection = getReadConnectionPool().acquireConnection();
getEventManager().postAcquireConnection(connection);
return connection;
}
/**
* INTERNAL:
* Startup the server session, also startup all of the connection pools.
*/
public void connect() {
// make sure pools correspond to their logins
updateStandardConnectionPools();
// Configure the read pool
getReadConnectionPool().startUp();
setAccessor(allocateReadConnection());
releaseReadConnection(getAccessor());
for (Iterator poolsEnum = getConnectionPools().values().iterator(); poolsEnum.hasNext();) {
((ConnectionPool)poolsEnum.next()).startUp();
}
}
/**
* INTERNAL:
* Override to acquire the connection from the pool at the last minute
*/
public Object executeCall(Call call, AbstractRecord translationRow, DatabaseQuery query) throws DatabaseException {
RuntimeException exception = null;
Object object = null;
boolean accessorAllocated = false;
if (query.getAccessor() == null) {
query.setAccessor(this.allocateReadConnection());
accessorAllocated = true;
}
try {
object = query.getAccessor().executeCall(call, translationRow, this);
} catch (RuntimeException caughtException) {
exception = caughtException;
} finally {
if (call.isFinished()) {
//don't release the cursoredStream connection until Stream is closed
try {
if (accessorAllocated) {
releaseReadConnection(query.getAccessor());
query.setAccessor(null);
}
} catch (RuntimeException releaseException) {
if (exception == null) {
throw releaseException;
}
//else ignore
}
}
if (exception != null) {
throw exception;
}
}
return object;
}
/**
* PUBLIC:
* Return the pool by name.
*/
public ConnectionPool getConnectionPool(String poolName) {
return (ConnectionPool)getConnectionPools().get(poolName);
}
/**
* INTERNAL:
* Connection are pooled to share and restrict the number of database connections.
*/
public Map getConnectionPools() {
return connectionPools;
}
/**
* PUBLIC:
* The default connection policy is used by default by the acquireClientConnection() protocol.
* By default it is a connection pool with min 5 and max 10 lazy pooled connections.
*/
public ConnectionPolicy getDefaultConnectionPolicy() {
if (defaultConnectionPolicy == null) {
this.defaultConnectionPolicy = new ConnectionPolicy("default");
}
return defaultConnectionPolicy;
}
/**
* PUBLIC:
* Return the default connection pool.
*/
public ConnectionPool getDefaultConnectionPool() {
return getConnectionPool("default");
}
/**
* INTERNAL:
* Gets the session which this query will be executed on.
* Generally will be called immediately before the call is translated,
* which is immediately before session.executeCall.
* <p>
* Since the execution session also knows the correct datasource platform
* to execute on, it is often used in the mappings where the platform is
* needed for type conversion, or where calls are translated.
* <p>
* Is also the session with the accessor. Will return a ClientSession if
* it is in transaction and has a write connection.
* @return a session with a live accessor
* @param query may store session name or reference class for brokers case
*/
public AbstractSession getExecutionSession(DatabaseQuery query) {
if (query.isObjectLevelModifyQuery()) {
throw QueryException.invalidQueryOnServerSession(query);
}
return this;
}
/**
* PUBLIC:
* Return the number of non-pooled database connections allowed.
* This can be enforced to make up for the resource limitation of most JDBC drivers and database clients.
* By default this is 50.
*/
public int getMaxNumberOfNonPooledConnections() {
return maxNumberOfNonPooledConnections;
}
/**
* INTERNAL:
* Return the current number of non-pooled connections in use.
*/
public int getNumberOfNonPooledConnectionsUsed() {
return numberOfNonPooledConnectionsUsed;
}
/**
* INTERNAL:
* Return the login for the read connection. Used by the platform autodetect feature
*/
protected Login getReadLogin(){
return getReadConnectionPool().getLogin();
}
/**
* PUBLIC:
* Return the read connection pool.
* The read connection pool handles allocating connection for read queries.
* By default a ReadConnnectionPool with a single connection. This is normally sufficient
* as a JDBC connection can support concurrent reading. Multiple connections can also
* be specified and may improve concurrency on some JDBC drivers/databases.
* If external connection pooling is used, an external connection pool will be used by default.
* If your JDBC driver does not support concurrency corrently a normal ConnectionPool can be used
* to ensure exclusive access to the read connection, note that this will give less concurrency.
*/
public ConnectionPool getReadConnectionPool() {
return readConnectionPool;
}
/**
* PUBLIC:
* Return if this session has been connected to the database.
*/
public boolean isConnected() {
if (getReadConnectionPool() == null) {
return false;
}
return getReadConnectionPool().isConnected();
}
/**
* INTERNAL:
* Return if this session is a server session.
*/
public boolean isServerSession() {
return true;
}
/**
* PUBLIC:
* Shutdown the server session, also shutdown all of the connection pools.
*/
public void logout() {
super.logout();
getReadConnectionPool().shutDown();
for (Iterator poolsEnum = getConnectionPools().values().iterator(); poolsEnum.hasNext();) {
((ConnectionPool)poolsEnum.next()).shutDown();
}
}
/**
* INTERNAL:
* Release the clients connection resource.
*/
public void releaseClientSession(ClientSession clientSession) throws DatabaseException {
if (clientSession.getConnectionPolicy().isPooled()) {
ConnectionPool pool = (ConnectionPool)getConnectionPools().get(clientSession.getConnectionPolicy().getPoolName());
getEventManager().preReleaseConnection(clientSession.getWriteConnection());
pool.releaseConnection(clientSession.getWriteConnection());
clientSession.setWriteConnection(null);
} else {
synchronized (this) {
clientSession.disconnect();
clientSession.setWriteConnection(null);
setNumberOfNonPooledConnectionsUsed(getNumberOfNonPooledConnectionsUsed() - 1);
notify();
}
}
}
/**
* INTERNAL:
* Release the read connection back into the read pool.
*/
public void releaseReadConnection(Accessor connection) {
getEventManager().preReleaseConnection(connection);
getReadConnectionPool().releaseConnection(connection);
}
/**
* INTERNAL:
* Connection are pooled to share and restrict the number of database connections.
*/
public void setConnectionPools(Map connectionPools) {
this.connectionPools = connectionPools;
}
/**
* PUBLIC:
* The default connection policy is used by default by the acquireClientConnection() protocol.
* By default it is a connection pool with min 5 and max 10 lazy pooled connections.
*/
public void setDefaultConnectionPolicy(ConnectionPolicy defaultConnectionPolicy) {
this.defaultConnectionPolicy = defaultConnectionPolicy;
}
/**
* PUBLIC:
* Creates and adds "default" connection pool using default parameter values
*/
public void setDefaultConnectionPool() {
addConnectionPool("default", getDatasourceLogin(), 5, 10);
}
/**
* PUBLIC:
* Set the number of non-pooled database connections allowed.
* This can be enforced to make up for the resource limitation of most JDBC drivers and database clients.
* By default this is 50.
*/
public void setMaxNumberOfNonPooledConnections(int maxNumberOfNonPooledConnections) {
this.maxNumberOfNonPooledConnections = maxNumberOfNonPooledConnections;
}
/**
* Set the current number of connections being used that are not from a connection pool.
* @param int
*/
public void setNumberOfNonPooledConnectionsUsed(int numberOfNonPooledConnectionsUsed) {
this.numberOfNonPooledConnectionsUsed = numberOfNonPooledConnectionsUsed;
}
/**
* PUBLIC:
* Set the read connection pool.
* The read connection pool handles allocating connection for read queries.
* By default a ReadConnnectionPool with a single connection. This is normally sufficient
* as a JDBC connection can support concurrent reading. Multiple connections can also
* be specified and may improve concurrency on some JDBC drivers/databases.
* If external connection pooling is used, an external connection pool will be used by default.
* If your JDBC driver does not support concurrency corrently a normal ConnectionPool can be used
* to ensure exclusive access to the read connection, note that this will give less concurrency.
*/
public void setReadConnectionPool(ConnectionPool readConnectionPool) {
if (isConnected()) {
throw ValidationException.cannotSetReadPoolSizeAfterLogin();
}
this.readConnectionPool = readConnectionPool;
this.readConnectionPool.setOwner(this);
}
/**
* PUBLIC:
* Creates and sets the new read connection pool.
*/
public void setReadConnectionPool(Login readLogin) throws ValidationException {
if (isConnected()) {
throw ValidationException.poolsMustBeConfiguredBeforeLogin();
}
ConnectionPool pool = null;
if (readLogin.shouldUseExternalConnectionPooling()) {
pool = new ExternalConnectionPool("read", readLogin, this);
} else {
pool = new ConnectionPool("read", readLogin, 2, 2, this);
}
this.readConnectionPool = pool;
}
/**
* INTERNAL:
* Updates standard connection pools. Should not be called after session is connected.
* This is needed in case of pools' logins been altered after the pool has been created
* (SessionManager does that)
* All pools should be re-created in case their type doesn't match their login.
* In addition, sequenceConnectionPool should be removed in case its login
* has shouldUseExternaltransactionController()==true (see setSequenceConnectionPool)
*/
protected void updateStandardConnectionPools() {
if (getDefaultConnectionPool() != null) {
if (getDefaultConnectionPool().isThereConflictBetweenLoginAndType()) {
setDefaultConnectionPool();
}
}
if (getReadConnectionPool() != null) {
if (getReadConnectionPool().isThereConflictBetweenLoginAndType()) {
setReadConnectionPool(getReadConnectionPool().getLogin());
}
}
}
/**
* PUBLIC:
* Configure the read connection pool.
* The read connection pool handles allocating connection for read queries.
* By default a ReadConnnectionPool with a single connection. This is normally sufficient
* as a JDBC connection can support concurrent reading. Multiple connections can also
* be specified and may improve concurrency on some JDBC drivers/databases.
* If external connection pooling is used, an external connection pool will be used by default.
* If your JDBC driver does not support concurrency corrently a normal ConnectionPool can be used
* to ensure exclusive access to the read connection, note that this will give less concurrency.
*/
public void useExclusiveReadConnectionPool(int minNumerOfConnections, int maxNumerOfConnections) {
setReadConnectionPool(new ConnectionPool("read", getDatasourceLogin(), minNumerOfConnections, maxNumerOfConnections, this));
}
/**
* PUBLIC:
* Configure the read connection pool.
* The read connection pool handles allocating connection for read queries.
* By default a ReadConnnectionPool with a single connection. This is normally sufficient
* as a JDBC connection can support concurrent reading. Multiple connections can also
* be specified and may improve concurrency on some JDBC drivers/databases.
* If external connection pooling is used, an external connection pool will be used by default.
* If your JDBC driver does not support concurrency corrently a normal ConnectionPool can be used
* to ensure exclusive access to the read connection, note that this will give less concurrency.
*/
public void useExternalReadConnectionPool() {
setReadConnectionPool(new ExternalConnectionPool("read", getDatasourceLogin(), this));
}
/**
* PUBLIC:
* Configure the read connection pool.
* The read connection pool handles allocating connection for read queries.
* By default a ReadConnnectionPool with a single connection. This is normally sufficient
* as a JDBC connection can support concurrent reading. Multiple connections can also
* be specified and may improve concurrency on some JDBC drivers/databases.
* If external connection pooling is used, an external connection pool will be used by default.
* If your JDBC driver does not support concurrency corrently a normal ConnectionPool can be used
* to ensure exclusive access to the read connection, note that this will give less concurrency.
*/
public void useReadConnectionPool(int minNumerOfConnections, int maxNumerOfConnections) {
setReadConnectionPool(new ReadConnectionPool("read", getDatasourceLogin(), minNumerOfConnections, maxNumerOfConnections, this));
}
/**
* INTERNAL:
* Return SequencingServer object owned by the session.
*/
public SequencingServer getSequencingServer() {
return getSequencingHome().getSequencingServer();
}
}