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package com.google.common.cache;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Supplier;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListenableFutureTask;
import com.google.errorprone.annotations.CheckReturnValue;
import java.io.Serializable;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
@ElementTypesAreNonnullByDefault
public abstract class CacheLoader<K, V> {
public abstract V load(K k) throws Exception;
protected CacheLoader() {
}
public ListenableFuture<V> reload(K k, V v) throws Exception {
Preconditions.checkNotNull(k);
Preconditions.checkNotNull(v);
return Futures.immediateFuture(load(k));
}
public Map<K, V> loadAll(Iterable<? extends K> iterable) throws Exception {
throw new UnsupportedLoadingOperationException();
}
@CheckReturnValue
public static <K, V> CacheLoader<K, V> from(Function<K, V> function) {
return new FunctionToCacheLoader(function);
}
@CheckReturnValue
public static <V> CacheLoader<Object, V> from(Supplier<V> supplier) {
return new SupplierToCacheLoader(supplier);
}
private static final class FunctionToCacheLoader<K, V> extends CacheLoader<K, V> implements Serializable {
private static final long serialVersionUID = 0;
private final Function<K, V> computingFunction;
public FunctionToCacheLoader(Function<K, V> function) {
this.computingFunction = (Function) Preconditions.checkNotNull(function);
}
public V load(K k) {
return this.computingFunction.apply(Preconditions.checkNotNull(k));
}
}
@CheckReturnValue
public static <K, V> CacheLoader<K, V> asyncReloading(CacheLoader<K, V> cacheLoader, final Executor executor) {
Preconditions.checkNotNull(cacheLoader);
Preconditions.checkNotNull(executor);
return new CacheLoader<K, V>() {
public V load(K k) throws Exception {
return CacheLoader.this.load(k);
}
public ListenableFuture<V> reload(final K k, final V v) throws Exception {
ListenableFutureTask create = ListenableFutureTask.create(new Callable<V>() {
public V call() throws Exception {
return CacheLoader.this.reload(k, v).get();
}
});
executor.execute(create);
return create;
}
public Map<K, V> loadAll(Iterable<? extends K> iterable) throws Exception {
return CacheLoader.this.loadAll(iterable);
}
};
}
private static final class SupplierToCacheLoader<V> extends CacheLoader<Object, V> implements Serializable {
private static final long serialVersionUID = 0;
private final Supplier<V> computingSupplier;
public SupplierToCacheLoader(Supplier<V> supplier) {
this.computingSupplier = (Supplier) Preconditions.checkNotNull(supplier);
}
public V load(Object obj) {
Preconditions.checkNotNull(obj);
return this.computingSupplier.get();
}
}
public static final class UnsupportedLoadingOperationException extends UnsupportedOperationException {
UnsupportedLoadingOperationException() {
}
}
public static final class InvalidCacheLoadException extends RuntimeException {
public InvalidCacheLoadException(String str) {
super(str);
}
}
}
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