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com.tangosol.run.jca
Class CacheAdapter

java.lang.Object
com.tangosol.util.Base
com.tangosol.run.jca.CacheAdapter

public class CacheAdapter

extends Base

CacheAdapter encapsulates the operations neccessary to communicate with Coherence™ resource adapter (coherence-tx.rar). The Coherence resource adapter, in turn, is a gateway into the Coherence clustered services, so some methods closely resemble methods at CacheFactory class.

In a simplest form a client code would look like:

   Context ctx = new InitialContext();

   CacheAdapter adapter = new CacheAdapter(ctx, "tangosol.coherenceTx",
       CacheAdapter.CONCUR_OPTIMISTIC, CacheAdapter.TRANSACTION_REPEATABLE_GET, 0);
   try
       {
       NamedCache map = adapter.getNamedCache("MyCache", getClass().getClassLoader(),
           new SimpleValidator(), false);

       // perform operations on the map
       }
   finally
       {
       adapter.close();
       }
 

Note: the CacheAdapter is intended to be used by one and only one thread at the time and is not thread safe.

Since:

Coherence 1.2

Author:

gg 2002.04.14

Nested Class Summary

static class

CacheAdapter.CacheConnectionSpec CacheConnectionSpec is an implementation of ConnectionSpec interface used to pass the connection info to the adapter.

Field Summary

static int	CONCUR_EXTERNAL Same as TransactionMap.CONCUR_EXTERNAL
static int	CONCUR_OPTIMISTIC Same as TransactionMap.CONCUR_OPTIMISTIC
static int	CONCUR_PESSIMISTIC Same as TransactionMap.CONCUR_PESSIMISTIC
static int	TRANSACTION_GET_COMMITTED Same as TransactionMap.TRANSACTION_GET_COMMITTED
static int	TRANSACTION_REPEATABLE_GET Same as TransactionMap.TRANSACTION_REPEATABLE_GET
static int	TRANSACTION_SERIALIZABLE Same as TransactionMap.TRANSACTION_SERIALIZABLE

Constructor Summary

CacheAdapter()
Construct the adapter using a default InitialContext, standard JNDI name, "optimistic" concurrency, "committed" isolation level an no timeout.

CacheAdapter(Context ctx, String sJndiName, int nConcur, int nIsolation, int nTimeout)
Construct the adapter using the specified Context and JNDI name

Method Summary

void	close() Close the connection assosiated with this adapter.
void	connect(String sServiceName, String sUserName, String sPassword) Connect the adapter to the specified clustered service.
void	connect(String sServiceName, String sServiceType, String sUserName, String sPassword) Connect the adapter to the specified clustered service.
protected void	finalize() Perform cleanup during garbage collection.
NamedCache	getDistributedCache(String sName, ClassLoader loader) Deprecated. use getNamedCache(java.lang.String, java.lang.ClassLoader) instead.
NamedCache	getNamedCache(String sName, ClassLoader loader) Obtain an instance of a NamedCache.
NamedCache	getNamedCache(String sName, ClassLoader loader, TransactionMap.Validator validator, boolean fImmutable) Obtain an instance of a NamedCache.
NamedCache	getReplicatedCache(String sName, ClassLoader loader) Deprecated. use getNamedCache(java.lang.String, java.lang.ClassLoader) instead.
protected boolean	isConnected() Return the connection status.
String	toString() Return a human readable description of the CacheAdapter.

Field Detail

TRANSACTION_GET_COMMITTED

public static final int TRANSACTION_GET_COMMITTED

Same as TransactionMap.TRANSACTION_GET_COMMITTED

See Also:

Constant Field Values

TRANSACTION_REPEATABLE_GET

public static final int TRANSACTION_REPEATABLE_GET

Same as TransactionMap.TRANSACTION_REPEATABLE_GET

See Also:

Constant Field Values

TRANSACTION_SERIALIZABLE

public static final int TRANSACTION_SERIALIZABLE

Same as TransactionMap.TRANSACTION_SERIALIZABLE

See Also:

Constant Field Values

CONCUR_PESSIMISTIC

public static final int CONCUR_PESSIMISTIC

Same as TransactionMap.CONCUR_PESSIMISTIC

See Also:

Constant Field Values

CONCUR_OPTIMISTIC

public static final int CONCUR_OPTIMISTIC

Same as TransactionMap.CONCUR_OPTIMISTIC

See Also:

Constant Field Values

CONCUR_EXTERNAL

public static final int CONCUR_EXTERNAL

Same as TransactionMap.CONCUR_EXTERNAL

See Also:

Constant Field Values

Constructor Detail

CacheAdapter

public CacheAdapter()

Construct the adapter using a default InitialContext, standard JNDI name, "optimistic" concurrency, "committed" isolation level an no timeout.

CacheAdapter

public CacheAdapter(Context ctx,
                    String sJndiName,
                    int nConcur,
                    int nIsolation,
                    int nTimeout)

Construct the adapter using the specified Context and JNDI name

Parameters:

ctx - the Context object to use for lookup operation; if null, the default InitialiContext is used

sJndiName - the JNDI name of the Coherence resource adapter; if null, the default name ("tangosol.coherenceTx") is used

nConcur - the default concurrency value

nIsolation - the default transaction isolation value

nTimeout - the default transaction timeout value (in seconds)

Method Detail

getReplicatedCache

public NamedCache getReplicatedCache(String sName,
                                     ClassLoader loader)

Deprecated. use getNamedCache(java.lang.String, java.lang.ClassLoader) instead.

Obtain an instance of a ReplicatedCache.

When called within a transaction, the returned cache will be transactional, controlled by the container's transaction coordinator. When called outside of a transaction, the returned cache will be non-transactional, which is equivalent to obtaining the instance directly from CacheFactory.

Parameters:

sName - cache name (unique across the cluster). If the NamedCache with the specified name already exists, a reference to the same object will be returned in the same transactional context

loader - ClassLoader that should be used to deserialize objects inserted in the map by other members of the cluster

Returns:

NamedCache interface of the ReplicatedCache service

Throws:

IllegalStateException - if the adapter is already connected to a different service

getDistributedCache

public NamedCache getDistributedCache(String sName,
                                      ClassLoader loader)

Deprecated. use getNamedCache(java.lang.String, java.lang.ClassLoader) instead.

Obtain an instance of a DistributedCache.

When called within a transaction, the returned cache will be transactional, controlled by the container's transaction coordinator. When called outside of a transaction, the returned cache will be non-transactional, which is equivalent to obtaining the instance directly from CacheFactory.

Parameters:

sName - cache name (unique across the cluster). If the NamedCache with the specified name already exists, a reference to the same object will be returned in the same transactional context

loader - ClassLoader that should be used to deserialize objects inserted in the map by other members of the cluster

Returns:

NamedCache interface of the DistributedCache service

Throws:

IllegalStateException - if the adapter is already connected to a different service

connect

public void connect(String sServiceName,
                    String sUserName,
                    String sPassword)

Connect the adapter to the specified clustered service. The service with the specified name must be running for this call to succeed.

Parameters:

sServiceName - service name (unique across the cluster)

sUserName - name of the user establishing a connection (optional)

sPassword - password for the user establishing a connection (optional)

Throws:

IllegalArgumentException - if the specified service is not running

IllegalStateException - if the adapter is already connected or

connect

public void connect(String sServiceName,
                    String sServiceType,
                    String sUserName,
                    String sPassword)

Connect the adapter to the specified clustered service. If the service with the specified name is not running an attempt will be made to start that service [default configuration]. If the name and type are not specified, a ConfigurableCacheFactory will be used to obtain the NamedCache instances.

Parameters:

sServiceName - service name (unique across the cluster)

sServiceType - service type (i.e. CacheService.TYPE_REPLICATED or CacheService.TYPE_DISTRIBUTED)

sUserName - name of the user establishing a connection (optional)

sPassword - password for the user establishing a connection (optional)

Throws:

IllegalArgumentException - if the specified service cannot be found

IllegalStateException - if the adapter is already connected

getNamedCache

public NamedCache getNamedCache(String sName,
                                ClassLoader loader)

Obtain an instance of a NamedCache. The NamedCache will be retrieved from the current ConfigurableCacheFactory using CacheFactory.getCache(sName, loader) unless the adapter is already connected to a specific cache service, in which case the corresponding NamedCache will be retrieved using service.ensureCache(sName, loader).

When called within a transaction, the returned cache will be transactional, controlled by the container's transaction coordinator. When called outside of a transaction, the returned cache will be non-transactional, which is equivalent to obtaining the instance directly from CacheFactory.

Parameters:

sName - cache name (unique across the cluster). If the NamedCache with the specified name already exists, a reference to the same object will be returned in the same transactional context

loader - ClassLoader that should be used to deserialize objects inserted in the map by other members of the cluster

Returns:

NamedCache object

getNamedCache

public NamedCache getNamedCache(String sName,
                                ClassLoader loader,
                                TransactionMap.Validator validator,
                                boolean fImmutable)

Obtain an instance of a NamedCache. The NamedCache will be retrieved from the current ConfigurableCacheFactory using CacheFactory.getCache(sName, loader) unless the adapter is already connected to a specific cache service, in which case the corresponding NamedCache will be retrieved using service.ensureCache(sName, loader).

When called within a transaction, the returned cache will be transactional, controlled by the container's transaction coordinator. When called outside of a transaction, the returned cache will be non-transactional, which is equivalent to obtaining the instance directly from CacheFactory.

Parameters:

sName - cache name (unique across the cluster). If the NamedCache with the specified name already exists, a reference to the same object will be returned in the same transactional context

loader - ClassLoader that should be used to deserialize objects inserted in the map by other members of the cluster

validator - the Validator object to be used to enlist and validate transactional resources; this parameter is only used within transactional context and only for optimistic concurrency

fImmutable - specifies whether or not the values kept in this cache are known to be immutable; this parameter is only used within transactional context

Returns:

NamedCache object

Since:

Coherence 2.3

See Also:

TransactionMap.setValidator(), TransactionMap.setValuesImmutable()

close

public void close()

Close the connection assosiated with this adapter.

isConnected

protected boolean isConnected()

Return the connection status.

Returns:

true if the adapter is currently connected; false otherwise.

toString

public String toString()

Return a human readable description of the CacheAdapter.

Returns:

a String representation of the CacheAdapter

finalize

protected void finalize()

Perform cleanup during garbage collection.

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