/
Task.java
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/
Task.java
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/*
* WorldEdit, a Minecraft world manipulation toolkit
* Copyright (C) sk89q <http://www.sk89q.com>
* Copyright (C) WorldEdit team and contributors
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sk89q.worldedit.function.task;
import static com.google.common.base.Preconditions.checkNotNull;
import com.sk89q.worldedit.WorldEditException;
import com.sk89q.worldedit.extension.platform.Actor;
import com.sk89q.worldedit.function.operation.Operation;
import com.sk89q.worldedit.function.operation.RunContext;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Deque;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Supplier;
/**
* A task to be run by the task manager. Includes a future
*/
public class Task<T> {
private final Deque<Operation> queue = new ArrayDeque<>();
private Operation current;
private Supplier<T> supplier;
private Consumer<T> consumer;
private Consumer<WorldEditException> exceptionConsumer;
private Consumer<String> statusConsumer;
private List<String> statusMessageList = new ArrayList<>();
/**
* Create a new queue with operations from the given collection.
*
* @param operations a collection of operations
*/
public Task(Collection<Operation> operations) {
checkNotNull(operations);
for (Operation operation : operations) {
queue.addLast(operation);
}
}
/**
* Create a new queue with operations from the given array.
*
* @param operation an array of operations
*/
public Task(Operation... operation) {
checkNotNull(operation);
for (Operation o : operation) {
queue.addLast(o);
}
}
/**
* Include a supplier for futures to retrieve information from.
*
* @param supplier The supplier
* @return The current task, for chaining
*/
public Task<T> withSupplier(Supplier<T> supplier) {
checkNotNull(supplier);
this.supplier = supplier;
return this;
}
/**
* Adds a consumer to receive information from the supplier.
*
* @param consumer The consumer
* @return The current task, for chaining
*/
public Task<T> withConsumer(Consumer<T> consumer) {
checkNotNull(this.supplier, "A supplier must be provided before a consumer!");
checkNotNull(consumer);
this.consumer = consumer;
return this;
}
public Task<T> onExcept(Consumer<WorldEditException> exceptionConsumer) {
checkNotNull(exceptionConsumer);
this.exceptionConsumer = exceptionConsumer;
return this;
}
/**
* Adds a consumer for status messages of tasks.
*
* @param statusConsumer The consumer
* @return The current task, for chaining
*/
public Task<T> withStatusConsumer(Consumer<String> statusConsumer) {
checkNotNull(statusConsumer);
this.statusConsumer = statusConsumer;
return this;
}
/**
* Adds exception and status consumers to this actor.
*
* @param actor The actor
* @return The task, for chaining
*/
public Task<T> addActorConsumers(Actor actor) {
checkNotNull(actor);
onExcept(e -> actor.printError(e.getMessage()));
withStatusConsumer(actor::print);
return this;
}
/**
* Resume the task with a given context.
*
* @param run The context
* @return If the task is completed.
*/
public boolean resumeTask(RunContext run) {
if (current == null && !queue.isEmpty()) {
current = queue.poll();
}
if (current != null) {
if (statusConsumer != null) {
statusMessageList.clear();
current.addStatusMessages(statusMessageList);
for (String message : statusMessageList) {
statusConsumer.accept(message);
}
}
try {
current = current.resume(run);
} catch (WorldEditException e) {
if (exceptionConsumer != null) {
exceptionConsumer.accept(e);
return true;
}
}
if (current == null) {
current = queue.poll();
}
}
if (current == null && consumer != null) {
consumer.accept(supplier.get());
}
return current == null;
}
public void cancel() {
for (Operation operation : queue) {
operation.cancel();
}
queue.clear();
}
}