org.infinispan.loaders.decorators
Class ReadOnlyStore

java.lang.Object
  org.infinispan.loaders.decorators.AbstractDelegatingStore
      org.infinispan.loaders.decorators.ReadOnlyStore

All Implemented Interfaces:

CacheLoader, CacheStore

public class ReadOnlyStore
extends AbstractDelegatingStore

A decorator that makes the underlying store a CacheLoader, i.e., suppressing all write methods.

Since:

4.0

Author:

Manik Surtani

Constructor Summary

ReadOnlyStore(CacheStore delegate)

Method Summary

void	clear() Clears all entries in the store
void	commit(GlobalTransaction tx) Commits a transaction that has been previously prepared.
void	fromStream(ObjectInput inputStream) Writes contents of the stream to the store.
void	prepare(List<? extends Modification> list, GlobalTransaction tx, boolean isOnePhase) Issues a prepare call with a set of modifications to be applied to the cache store
void	purgeExpired() Purges expired entries from the store.
boolean	remove(Object key) Removes an entry in the store.
void	rollback(GlobalTransaction tx) Rolls back a transaction that has been previously prepared This method may be invoked on a transaction for which there is no prior CacheStore.prepare(java.util.List, org.infinispan.transaction.xa.GlobalTransaction, boolean).
void	store(InternalCacheEntry ed) Stores an entry

Methods inherited from class org.infinispan.loaders.decorators.AbstractDelegatingStore

containsKey, getCacheStoreConfig, getConfigurationClass, getDelegate, init, load, loadAll, removeAll, setDelegate, start, stop, toStream

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReadOnlyStore

public ReadOnlyStore(CacheStore delegate)

Method Detail

store

public void store(InternalCacheEntry ed)

Description copied from interface: CacheStore

Stores an entry

Specified by:

store in interface CacheStore

Overrides:

store in class AbstractDelegatingStore

Parameters:

ed - entry to store

fromStream

public void fromStream(ObjectInput inputStream)

Description copied from interface: CacheStore

Writes contents of the stream to the store. Implementations should expect that the stream contains data in an implementation-specific format, typically generated using CacheStore.toStream(java.io.ObjectOutput). While not a requirement, it is recommended that implementations make use of the Marshaller when dealing with the stream to make use of efficient marshalling.

It is imperative that implementations do not close the stream after finishing with it.

It is also recommended that implementations use their own start and end markers on the stream since other processes may write additional data to the stream after the cache store has written to it. As such, either markers or some other mechanism to prevent the store from reading too much information should be employed when writing to the stream in CacheStore.fromStream(java.io.ObjectInput) to prevent data corruption.

It can be assumed that the stream passed in already performs buffering such that the cache store implementation doesn't have to.

Specified by:

fromStream in interface CacheStore

Overrides:

fromStream in class AbstractDelegatingStore

Parameters:

inputStream - stream to read from

clear

public void clear()

Description copied from interface: CacheStore

Clears all entries in the store

Specified by:

clear in interface CacheStore

Overrides:

clear in class AbstractDelegatingStore

remove

public boolean remove(Object key)

Description copied from interface: CacheStore

Removes an entry in the store.

Specified by:

remove in interface CacheStore

Overrides:

remove in class AbstractDelegatingStore

Parameters:

key - key to remove

Returns:

true if the entry was removed; false if the entry wasn't found.

purgeExpired

public void purgeExpired()

Description copied from interface: CacheStore

Purges expired entries from the store.

Specified by:

purgeExpired in interface CacheStore

Overrides:

purgeExpired in class AbstractDelegatingStore

commit

public void commit(GlobalTransaction tx)

Description copied from interface: CacheStore

Commits a transaction that has been previously prepared.

This method may be invoked on a transaction for which there is no prior CacheStore.prepare(java.util.List, org.infinispan.transaction.xa.GlobalTransaction, boolean). The implementation would need to deal with this case acordingly. Typically, this would be a no-op, after ensuring any resources attached to the transaction are cleared up.

Also note that this method may be invoked on a thread which is different from the CacheStore.prepare(java.util.List, org.infinispan.transaction.xa.GlobalTransaction, boolean) invocation. As such, ThreadLocals should not be relied upon to maintain transaction context.

Specified by:

commit in interface CacheStore

Overrides:

commit in class AbstractDelegatingStore

Parameters:

tx - tx to commit

rollback

public void rollback(GlobalTransaction tx)

Description copied from interface: CacheStore

Rolls back a transaction that has been previously prepared

This method may be invoked on a transaction for which there is no prior CacheStore.prepare(java.util.List, org.infinispan.transaction.xa.GlobalTransaction, boolean). The implementation would need to deal with this case acordingly. Typically, this would be a no-op, after ensuring any resources attached to the transaction are cleared up.

Also note that this method may be invoked on a thread which is different from the CacheStore.prepare(java.util.List, org.infinispan.transaction.xa.GlobalTransaction, boolean) invocation. As such, ThreadLocals should not be relied upon to maintain transaction context.

Specified by:

rollback in interface CacheStore

Overrides:

rollback in class AbstractDelegatingStore

Parameters:

tx - tx to roll back

prepare

public void prepare(List<? extends Modification> list,
                    GlobalTransaction tx,
                    boolean isOnePhase)

Description copied from interface: CacheStore

Issues a prepare call with a set of modifications to be applied to the cache store

Specified by:

prepare in interface CacheStore

Overrides:

prepare in class AbstractDelegatingStore

Parameters:

list - modifications to be applied

tx - transaction identifier

isOnePhase - if true, there will not be a commit or rollback phase and changes should be flushed immediately