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Improve design

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This commit is contained in:
Alexander Söderberg 2020-05-17 12:55:07 +02:00
parent 7591c440c2
commit 792fa1f11d
4 changed files with 36 additions and 126 deletions
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49
Core/src/main/java/com/plotsquared/core/uuid/ServiceFailure.java
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@ -1,49 +0,0 @@
/*
* _____ _ _ _____ _
* | __ \| | | | / ____| | |
* | |__) | | ___ | |_| (___ __ _ _ _ __ _ _ __ ___ __| |
* | ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
* | | | | (_) | |_ ____) | (_| | |_| | (_| | | | __/ (_| |
* |_| |_|\___/ \__|_____/ \__, |\__,_|\__,_|_| \___|\__,_|
* | |
* |_|
* PlotSquared plot management system for Minecraft
* Copyright (C) 2020 IntellectualSites
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.plotsquared.core.uuid;
import java.util.concurrent.CompletableFuture;
/**
* Thrown by a {@link UUIDService} when it cannot
* complete a request. This is not an error and
* will be dealt with silently.
*/
public class ServiceFailure extends Throwable {
private static final ServiceFailure instance = new ServiceFailure();
public static <T> CompletableFuture<T> getFuture() {
final CompletableFuture<T> completableFuture = new CompletableFuture<>();
completableFuture.completeExceptionally(instance);
return completableFuture;
}
@Override public Throwable fillInStackTrace() {
return this;
}
}

89
Core/src/main/java/com/plotsquared/core/uuid/UUIDPipeline.java
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@ -28,8 +28,11 @@ package com.plotsquared.core.uuid;
import com.google.common.collect.Lists;
import org.jetbrains.annotations.NotNull;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;
import java.util.Optional;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
@ -79,9 +82,7 @@ public class UUIDPipeline {
* @return Copy of service list
*/
public List<UUIDService> getServiceListInstance() {
final List<UUIDService> serviceList = Lists.newLinkedList(this.serviceList);
serviceList.add(EndOfPipeline.instance);
return serviceList;
return Collections.unmodifiableList(this.serviceList);
}
private void consume(@NotNull final UUIDMapping mapping) {
@ -93,74 +94,34 @@ public class UUIDPipeline {
/**
* Asynchronously attempt to fetch the mapping from a given UUID or username
*
* @param request UUID or username
* @param requests UUIDs or usernames
* @return Future that may complete with the mapping
*/
public CompletableFuture<UUIDMapping> get(@NotNull final Object request) {
if (!(request instanceof String) && !(request instanceof UUID)) {
throw new IllegalArgumentException("Request has to be either a username or UUID");
}
final CompletableFuture<UUIDMapping> future = new CompletableFuture<>();
final ListIterator<UUIDService> serviceListIterator
= this.getServiceListInstance().listIterator();
final Runnable[] runnable = new Runnable[1];
runnable[0] = () -> {
if (serviceListIterator.hasNext()) {
final UUIDService uuidService = serviceListIterator.next();
uuidService.get(request).whenCompleteAsync(((result, throwable) -> {
if (throwable != null) {
if (throwable instanceof ServiceFailure) {
try {
runnable[0].run();
} catch (final Throwable inner) {
future.completeExceptionally(inner);
}
} else {
future.completeExceptionally(throwable);
}
} else {
public CompletableFuture<Collection<UUIDMapping>> get(@NotNull final Collection<Object> requests) {
final List<UUIDService> serviceList = this.getServiceListInstance();
return CompletableFuture.supplyAsync(() -> {
final List<UUIDMapping> mappings = new ArrayList<>(requests.size());
outer: for (final Object request : requests) {
if (!(request instanceof String) && !(request instanceof UUID)) {
throw new IllegalArgumentException("Request has to be either a username or UUID");
}
for (final UUIDService service : serviceList) {
final Optional<?> result = service.get(request);
if (result.isPresent()) {
final String username = request instanceof String ? (String) request
: (String) result;
: (String) result.get();
final UUID uuid = request instanceof UUID ? (UUID) request
: (UUID) result;
: (UUID) result.get();
final UUIDMapping mapping = new UUIDMapping(uuid, username);
future.complete(mapping);
this.consume(mapping);
mappings.add(mapping);
continue outer;
}
}), this.executor);
} else {
throw new ServiceError("Pipeline is incomplete");
}
throw new ServiceError("End of pipeline");
}
};
try {
// Start the pipeline traversal
runnable[0].run();
} catch (final Throwable throwable) {
future.completeExceptionally(throwable);
}
return future;
}
/**
* Indicates that the end of the pipeline has been reached, this
* will cause the request to fail, as no service was able to
* fulfil the request
*/
private static class EndOfPipeline implements UUIDService {
public static final EndOfPipeline instance = new EndOfPipeline();
@Override @NotNull public CompletableFuture<String> get(@NotNull final UUID uuid) {
final CompletableFuture<String> future = new CompletableFuture<>();
future.completeExceptionally(new ServiceError("End of pipeline"));
return future;
}
@Override @NotNull public CompletableFuture<UUID> get(@NotNull final String username) {
final CompletableFuture<UUID> future = new CompletableFuture<>();
future.completeExceptionally(new ServiceError("End of pipeline"));
return future;
}
return mappings;
}, this.executor);
}
}

12
Core/src/main/java/com/plotsquared/core/uuid/UUIDService.java
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@ -27,15 +27,15 @@ package com.plotsquared.core.uuid;
import org.jetbrains.annotations.NotNull;
import java.util.Optional;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
/**
* Service used to provide usernames from player UUIDs
*/
public interface UUIDService {
default CompletableFuture<?> get(@NotNull final Object request) {
default Optional<?> get(@NotNull final Object request) {
if (request instanceof UUID) {
return get((UUID) request);
} else if (request instanceof String) {
@ -54,9 +54,9 @@ public interface UUIDService {
* this completes with an empty optional.
*
* @param uuid Player UUID
* @return Future that may contain the username if it exists
* @return Optional that may contain the username if it exists
*/
@NotNull CompletableFuture<String> get(@NotNull final UUID uuid);
@NotNull Optional<String> get(@NotNull final UUID uuid);
/**
* Get a stored UUID from the service if it exists.
@ -67,8 +67,8 @@ public interface UUIDService {
* this completes with an empty optional.
*
* @param username Player username
* @return Future that may contain the UUID if it exists
* @return Optional that may contain the UUID if it exists
*/
@NotNull CompletableFuture<UUID> get(@NotNull final String username);
@NotNull Optional<UUID> get(@NotNull final String username);
}

12
Core/src/main/java/com/plotsquared/core/uuid/offline/OfflineModeUUIDService.java
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@ -27,13 +27,12 @@ package com.plotsquared.core.uuid.offline;
import com.google.common.base.Charsets;
import com.plotsquared.core.configuration.Settings;
import com.plotsquared.core.uuid.ServiceFailure;
import com.plotsquared.core.uuid.UUIDService;
import org.jetbrains.annotations.NotNull;
import java.util.Locale;
import java.util.Optional;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
/**
* Name provider service that creates UUIDs from usernames
@ -47,13 +46,12 @@ public class OfflineModeUUIDService implements UUIDService {
return UUID.nameUUIDFromBytes(("OfflinePlayer:" + username).getBytes(Charsets.UTF_8));
}
@Override @NotNull public CompletableFuture<String> get(@NotNull final UUID uuid) {
// This service can only get UUIDs from usernames
return ServiceFailure.getFuture();
@Override @NotNull public Optional<String> get(@NotNull final UUID uuid) {
return Optional.empty();
}
@Override @NotNull public CompletableFuture<UUID> get(@NotNull final String username) {
return CompletableFuture.completedFuture(this.getFromUsername(username));
@Override @NotNull public Optional<UUID> get(@NotNull final String username) {
return Optional.of(this.getFromUsername(username));
}
}