blob: 6971b2ea8f5c1e0c3331b3bfeea1e021c3534339 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.feed.client;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.ServiceLoader;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import static ai.vespa.feed.client.FeedClientBuilder.PREFERRED_IMPLEMENTATION_PROPERTY;
/**
* @author bjorncs
*/
class Helper {
private static final AtomicReference<Supplier<FeedClientBuilder>> feedClientBuilderSupplier = new AtomicReference<>(Helper::getFeedClientBuilder);
static final void setFeedClientBuilderSupplier(Supplier<FeedClientBuilder> supplier) {
feedClientBuilderSupplier.set(supplier);
}
static Supplier<FeedClientBuilder> getFeedClientBuilderSupplier() {
return feedClientBuilderSupplier.get();
}
static FeedClientBuilder getFeedClientBuilder() {
String defaultImplementation = "ai.vespa.feed.client.impl.FeedClientBuilderImpl";
String preferredImplementation = System.getProperty(PREFERRED_IMPLEMENTATION_PROPERTY, defaultImplementation);
Iterator<FeedClientBuilder> iterator = ServiceLoader.load(FeedClientBuilder.class).iterator();
if (iterator.hasNext()) {
List<FeedClientBuilder> builders = new ArrayList<>();
iterator.forEachRemaining(builders::add);
return builders.stream()
.filter(builder -> preferredImplementation.equals(builder.getClass().getName()))
.findFirst()
.orElse(builders.get(0));
} else {
try {
Class<?> aClass = Class.forName(preferredImplementation);
for (Constructor<?> constructor : aClass.getConstructors()) {
if (constructor.getParameterTypes().length == 0) {
return ((FeedClientBuilder) constructor.newInstance());
}
}
throw new RuntimeException("Could not find Feed client builder implementation");
} catch (ClassNotFoundException | InvocationTargetException | InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
private Helper() {}
@SafeVarargs
static List<Result> await(CompletableFuture<Result>... promises) throws MultiFeedException {
List<CompletableFuture<Result>> list = new ArrayList<>();
for (CompletableFuture<Result> p : promises) list.add(p);
return await(list);
}
static List<Result> await(List<CompletableFuture<Result>> promises) throws MultiFeedException {
try {
CompletableFuture.allOf(promises.toArray(new CompletableFuture<?>[0])).join();
return promises.stream()
.map(p -> Objects.requireNonNull(p.getNow(null)))
.collect(Collectors.toList());
} catch (CompletionException e) {
List<FeedException> exceptions = new ArrayList<>();
for (CompletableFuture<Result> promise : promises) {
if (promise.isCompletedExceptionally()) {
// Lambda is executed on this thread since the future is already completed
promise.whenComplete((__, error) -> exceptions.add((FeedException) error));
}
}
throw new MultiFeedException(exceptions);
}
}
}
|
