Package org.pipservices3.components.cache

Class MemoryCache

java.lang.Object

org.pipservices3.components.cache.MemoryCache

All Implemented Interfaces:

org.pipservices3.commons.config.IConfigurable, org.pipservices3.commons.config.IReconfigurable, ICache

public class MemoryCache
extends Object
implements ICache, org.pipservices3.commons.config.IReconfigurable

Cache that stores values in the process memory.

Remember: This implementation is not suitable for synchronization of distributed processes.

### Configuration parameters ###

• options:
  • timeout: default caching timeout in milliseconds (default: 1 minute)
  • max_size: maximum number of values stored in this cache (default: 1000)

### Example ###

 
 MemoryCache cache = new MemoryCache();

 cache.store("123", "key1", "ABC", 0);
 
 

See Also:

• ICache

Constructor Summary

Constructors

Constructor	Description
MemoryCache()	Creates instance of local in-memory cache component

Method Summary

Modifier and Type	Method	Description
void	configure(org.pipservices3.commons.config.ConfigParams config)	Configures component by passing configuration parameters.
void	remove(String correlationId, String key)	Removes a value from the cache by its key.
Object	retrieve(String correlationId, String key)	Retrieves cached value from the cache using its key.
Object	store(String correlationId, String key, Object value, long timeout)	Stores value in the cache with expiration time.

Methods inherited from class java.lang.Object

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

Constructor Details

MemoryCache

public MemoryCache()

Creates instance of local in-memory cache component

Method Details

configure

public void configure(org.pipservices3.commons.config.ConfigParams config)
               throws org.pipservices3.commons.errors.ConfigException

Configures component by passing configuration parameters.

Specified by:

configure in interface org.pipservices3.commons.config.IConfigurable

Parameters:

config - configuration parameters to be set.

Throws:

org.pipservices3.commons.errors.ConfigException - when component is in illegal state or configuration validation fails.

retrieve

public Object retrieve(String correlationId,
 String key)

Retrieves cached value from the cache using its key. If value is missing in the cache or expired it returns null.

Specified by:

retrieve in interface ICache

Parameters:

correlationId - (optional) transaction id to trace execution through call chain.

key - a unique value key.

Returns:

a cached value or null if value wasn't found or timeout expired.

store

public Object store(String correlationId,
 String key,
 Object value,
 long timeout)

Stores value in the cache with expiration time.

Specified by:

store in interface ICache

Parameters:

correlationId - (optional) transaction id to trace execution through call chain.

key - a unique value key.

value - a value to store.

timeout - expiration timeout in milliseconds.

Returns:

a cached value stored in the cache.

remove

public void remove(String correlationId,
 String key)

Removes a value from the cache by its key.

Specified by:

remove in interface ICache

Parameters:

correlationId - (optional) transaction id to trace execution through call chain.

key - a unique value key.