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// ============================================================================
// Copyright (c) 2017-2019 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.task;
import static nullablej.nullable.Nullable.nullable;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiPredicate;
import java.util.function.Predicate;
import java.util.function.Supplier;
import functionalj.function.Func0;
import functionalj.function.Func1;
import functionalj.function.Func2;
import functionalj.function.Func3;
import functionalj.function.Func4;
import functionalj.function.Func5;
import functionalj.function.Func6;
import functionalj.function.FuncUnit1;
import functionalj.list.FuncList;
import functionalj.promise.DeferAction;
import functionalj.promise.DeferActionBuilder;
import functionalj.promise.Promise;
import functionalj.promise.RaceResult;
import functionalj.result.Result;
import lombok.val;
public class Tasks {
public static class TaskValue implements Task {
private final DATA value;
public TaskValue(DATA value) {
this.value = value;
}
@Override
public DeferAction createAction() {
return DeferAction.ofValue(value);
}
public String toString() {
return "Task(" + value + ")";
}
}
public static class TaskSupplier extends DeferActionBuilder implements Task {
public TaskSupplier(Func0 supplier) {
super(supplier);
}
@Override
public DeferAction createAction() {
return build();
}
public String toString() {
return "Task(()->" + supplier() + ")";
}
}
public static class TaskResult implements Task {
private final Result result;
public TaskResult(Result result) {
this.result = result;
}
@Override
public DeferAction createAction() {
val action = DeferAction.of((Class)null);
action.start();
if (result.isValue())
action.complete(result.getValue());
else action.fail (result.getException());
return action;
}
public String toString() {
return "Task(" + result + ")";
}
}
public static class TaskPromise implements Task {
private final Promise promise;
public TaskPromise(Promise promise) {
this.promise = promise;
}
@Override
public DeferAction createAction() {
val action = DeferAction.of((Class)null, ()->{
if (promise != null)
promise.start();
});
if (promise != null) {
promise
.eavesdrop(result -> {
val pendingAction = action.start();
if (result.isValue())
pendingAction.complete(result.getValue());
else pendingAction.fail (result.getException());
});
}
return action;
}
public String toString() {
return "Task(" + promise + ")";
}
}
public static class IOInstance implements Task {
private final String toString;
private final Supplier> createAction;
public IOInstance(String toString, Supplier> createAction) {
this.toString = (toString != null) ? toString : "Task@" + hashCode();
this.createAction = Objects.requireNonNull(createAction);
}
@Override
public DeferAction createAction() {
return createAction.get();
}
public String toString() {
return toString;
}
}
public static class TaskPeek implements Task {
private final Task source;
private final FuncUnit1 peeker;
public TaskPeek(Task source, FuncUnit1 peeker) {
this.source = source;
this.peeker = peeker;
}
@Override
public DeferAction createAction() {
return source.createAction().peek(peeker);
}
public String toString() {
return source + ".peek(" + peeker + ")";
}
}
public static class TaskMap implements Task {
private final Task source;
private final Func1 mapper;
public TaskMap(Task source, Func1 mapper) {
this.source = source;
this.mapper = mapper;
}
@Override
public DeferAction createAction() {
DeferAction map = source
.createAction()
.map(mapper);
return map;
}
public String toString() {
return source + ".map(" + mapper + ")";
}
}
public static class TaskChain implements Task {
private final Task source;
private final Func1> mapper;
public TaskChain(Task source, Func1> mapper) {
this.source = source;
this.mapper = mapper;
}
@SuppressWarnings("unchecked")
@Override
public DeferAction createAction() {
val ioDefer = source.createAction().map(mapper);
val ioPromise = ioDefer.getPromise();
val action = (DeferAction)DeferAction.createNew(()->ioPromise.start());
ioPromise
.subscribe(io -> {
val pendindAction = action.start();
io
.createAction()
.start()
.eavesdrop(result -> {
if (result.isValue())
pendindAction.complete(result.getValue());
else pendindAction.fail (result.getException());
});
});
return action;
}
public String toString() {
return source + ".chain(" + mapper + ")";
}
}
public static class TaskFilter implements Task {
private final Task source;
private final Predicate predicate;
public TaskFilter(Task source, Predicate predicate) {
this.source = source;
this.predicate = predicate;
}
@Override
public DeferAction createAction() {
return source.createAction().filter(predicate);
}
public String toString() {
return source + ".filter(" + predicate + ")";
}
}
public static class TaskCached implements Task {
private final Task source;
private final DeferAction action;
public TaskCached(Task source) {
this.source = source;
this.action = source.createAction();
}
@Override
public DeferAction createAction() {
return action;
}
public String toString() {
return source + ".cached()";
}
}
public static class TaskCachedFor implements Task {
private final Task source;
private final Supplier contextSupplier;
private final BiPredicate staleChecker;
private final AtomicReference contxtRef;
private final AtomicReference> actionRef;
public TaskCachedFor(Task source, Supplier contextSupplier, BiPredicate staleChecker) {
this.source = source;
this.contextSupplier = contextSupplier;
this.staleChecker = staleChecker;
this.actionRef = new AtomicReference<>(null);
this.contxtRef = new AtomicReference<>(contextSupplier.get());
}
@Override
public DeferAction createAction() {
val act = actionRef.get();
val ctx = contxtRef.get();
val newRef = contextSupplier.get();
if (staleChecker.test(ctx, newRef) || (act == null)) {
actionRef.compareAndSet(act, source.createAction());
contxtRef.set(newRef);
return actionRef.get();
}
return act;
}
public String toString() {
return source + ".cachedFor(" + contextSupplier + "," + staleChecker + ")";
}
}
// merge, race, loop, branch
public static class TaskMerge2 implements Task {
private final Task input1;
private final Task input2;
private final Func2 merger;
public TaskMerge2(Task input1, Task input2, Func2 merger) {
this.input1 = input1;
this.input2 = input2;
this.merger = merger;
}
@Override
public DeferAction createAction() {
val action1 = input1.createAction();
val action2 = input2.createAction();
val action = DeferAction.from(action1, action2, merger);
return action;
}
@Override
public String toString() {
return merger + "(" + input1 + ", " + input2 + ")";
}
}
public static class TaskMerge3 implements Task {
private final Task input1;
private final Task input2;
private final Task input3;
private final Func3 merger;
public TaskMerge3(Task input1, Task input2, Task input3, Func3 merger) {
this.input1 = input1;
this.input2 = input2;
this.input3 = input3;
this.merger = merger;
}
@Override
public DeferAction createAction() {
val action1 = input1.createAction();
val action2 = input2.createAction();
val action3 = input3.createAction();
val action = DeferAction.from(action1, action2, action3, merger);
return action;
}
@Override
public String toString() {
return merger + "(" + input1 + ", " + input2 + ", " + input3 + ")";
}
}
public static class TaskMerge4 implements Task {
private final Task input1;
private final Task input2;
private final Task input3;
private final Task input4;
private final Func4 merger;
public TaskMerge4(Task input1, Task input2, Task input3, Task input4, Func4 merger) {
this.input1 = input1;
this.input2 = input2;
this.input3 = input3;
this.input4 = input4;
this.merger = merger;
}
@Override
public DeferAction createAction() {
val action1 = input1.createAction();
val action2 = input2.createAction();
val action3 = input3.createAction();
val action4 = input4.createAction();
val action = DeferAction.from(action1, action2, action3, action4, merger);
return action;
}
@Override
public String toString() {
return merger + "(" + input1 + ", " + input2 + ", " + input3 + ", " + input4 + ")";
}
}
public static class TaskMerge5 implements Task {
private final Task input1;
private final Task input2;
private final Task input3;
private final Task input4;
private final Task input5;
private final Func5 merger;
public TaskMerge5(Task input1, Task input2, Task input3, Task input4, Task input5, Func5 merger) {
this.input1 = input1;
this.input2 = input2;
this.input3 = input3;
this.input4 = input4;
this.input5 = input5;
this.merger = merger;
}
@Override
public DeferAction createAction() {
val action1 = input1.createAction();
val action2 = input2.createAction();
val action3 = input3.createAction();
val action4 = input4.createAction();
val action5 = input5.createAction();
val action = DeferAction.from(action1, action2, action3, action4, action5, merger);
return action;
}
@Override
public String toString() {
return merger + "(" + input1 + ", " + input2 + ", " + input3 + ", " + input4 + ", " + input5 + ")";
}
}
public static class TaskMerge6 implements Task {
private final Task input1;
private final Task input2;
private final Task input3;
private final Task input4;
private final Task input5;
private final Task input6;
private final Func6 merger;
public TaskMerge6(Task input1, Task input2, Task input3, Task input4, Task input5, Task input6, Func6 merger) {
this.input1 = input1;
this.input2 = input2;
this.input3 = input3;
this.input4 = input4;
this.input5 = input5;
this.input6 = input6;
this.merger = merger;
}
@Override
public DeferAction createAction() {
val action1 = input1.createAction();
val action2 = input2.createAction();
val action3 = input3.createAction();
val action4 = input4.createAction();
val action5 = input5.createAction();
val action6 = input6.createAction();
val action = DeferAction.from(action1, action2, action3, action4, action5, action6, merger);
return action;
}
@Override
public String toString() {
return merger + "(" + input1 + ", " + input2 + ", " + input3 + ", " + input4 + ", " + input5 + ", " + input6 + ")";
}
}
public static class TaskRace implements Task {
private final FuncList> list;
@SuppressWarnings({ "unchecked", "rawtypes" })
public TaskRace(List> list) {
this.list = (FuncList)nullable(list).map(FuncList::from).orElse(FuncList.empty());
}
@Override
public DeferAction createAction() {
val actions = list.map(io -> io.createAction());
val raceResult = RaceResult.from(actions);
val promise = raceResult.getResultPromise();
val action = DeferAction.of((Class)null, ()->{
if (promise != null)
promise.start();
});
if (promise != null) {
promise
.eavesdrop(result -> {
val pendingAction = action.start();
if (result.isValue())
pendingAction.complete(result.getValue());
else pendingAction.fail (result.getException());
});
}
return action;
}
@Override
public String toString() {
return "Race(" + list.joinToString(",") + ")";
}
}
public static class TaskDoUntil implements Task {
private final Task body;
private final Predicate> breakCheck;
public TaskDoUntil(Task body, Predicate> breakCheck) {
this.body = body;
this.breakCheck = breakCheck;
}
@Override
public DeferAction createAction() {
val actionRef = new AtomicReference>();
val action = DeferAction.of((Class)null, ()->{
doBody(actionRef);
});
actionRef.set(action);
return action;
}
private void doBody(AtomicReference> actionRef) {
val bodyAction = body.createAction();
// Ummm not sure if subscribe is good here
bodyAction.onComplete(result -> {
val isToBreak = breakCheck.test(result);
if (isToBreak) {
val action = actionRef.get().start();
if (result.isValue())
action.complete(result.value());
else action.fail (result.exception());
} else {
doBody(actionRef);
}
});
bodyAction.start();
}
@Override
public String toString() {
return "DoUntil(do: " + body + ", util: " + breakCheck + ")";
}
}
}
