functionalj.promise.RetryableDeferActionCreator Maven / Gradle / Ivy

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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.promise;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;

import functionalj.environments.AsyncRunner;
import functionalj.environments.Env;
import functionalj.function.Func0;
import functionalj.function.FuncUnit0;
import functionalj.function.FuncUnit1;
import functionalj.ref.Ref;
import functionalj.result.Result;
import lombok.val;


public class RetryableDeferActionCreator {
    
    private static final RetryableDeferActionCreator instance = new RetryableDeferActionCreator();
    
    public static final Ref current
            = Ref.of(RetryableDeferActionCreator.class)
            .defaultTo(RetryableDeferActionCreator.instance);
    
    public  DeferAction createRetryDeferAction(
            boolean     interruptOnCancel,
            FuncUnit0   onStart,
            AsyncRunner runner,
            Retry retry,
            Func0 supplier) {
        DeferAction finalAction = DeferAction.createNew();
        
        val config = new DeferActionConfig()
                .interruptOnCancel(interruptOnCancel)
                .onStart(onStart)
                .runner(runner);
        
        val couter  = new AtomicInteger(retry.times());
        val builder = config.createBuilder(supplier);
        
        val onCompleteRef = new AtomicReference>>();
        val onComplete    = (FuncUnit1>)(result -> {
            if (result.isPresent()) {
                val value = result.value();
                finalAction.complete(value);
            } else {
                val count = couter.decrementAndGet();
                if (count == 0) {
                    finalAction.abort("Retry exceed: " + retry.times());
                } else {
                    val period = retry.waitTimeMilliSecond();
                    Env.time().sleep(period);
                    
                    builder
                    .build()
                    .onComplete(onCompleteRef.get())
                    .start();
                }
            }
        });
        onCompleteRef.set(onComplete);
        
        builder
        .build()
        .onComplete(onComplete)
        .start();
        
        return finalAction;
    }
    
}