Package liquibase.util

Class Cache<T>

java.lang.Object

liquibase.util.Cache<T>

public class Cache<T>
extends Object

A wrapper around a method which is expected to be called multiple times. This class orchestrates ensuring that the method is called once and storing the result value for subsequent executions, with support for time-to-live (TTL). Some of the logic in this class is borrowed from the Guava implementation of ExpiringMemoizingSupplier: https://github.com/google/guava/blob/cc2c5d3d6623fe66a969c29fcb422bf02fb57a1f/guava/src/com/google/common/base/Suppliers.java#L286-L346

Constructor Summary

Constructors

Constructor	Description
Cache(Callable<T> generator)
Cache(Callable<T> generator, boolean exceptionIsPermitted)
Cache(Callable<T> generator, boolean exceptionIsPermitted, long timeToLiveMillis)

Method Summary

Modifier and Type	Method	Description
void	clearCache()	Clears the cache and resets its state.
T	get()

Methods inherited from class java.lang.Object

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

Constructor Details

Cache

public Cache(Callable<T> generator)

Cache

public Cache(Callable<T> generator,
 boolean exceptionIsPermitted)

Cache

public Cache(Callable<T> generator,
 boolean exceptionIsPermitted,
 long timeToLiveMillis)

Method Details

get

public T get()
      throws Exception

Throws:

Exception

clearCache

public void clearCache()

Clears the cache and resets its state.