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/*
 * Copyright 2016 Davide Maestroni
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.github.dm.jrt.operator;

import com.github.dm.jrt.core.channel.Channel;
import com.github.dm.jrt.core.invocation.Invocation;
import com.github.dm.jrt.core.invocation.InvocationFactory;
import com.github.dm.jrt.core.invocation.TemplateInvocation;
import com.github.dm.jrt.core.util.ConstantConditions;
import com.github.dm.jrt.function.SupplierDecorator;

import org.jetbrains.annotations.NotNull;

import static com.github.dm.jrt.core.util.Reflection.asArgs;

/**
 * Invocation factory employing a supplier to generate outputs when no one has been received.
 * 

* Created by davide-maestroni on 04/29/2016. * * @param the data type. */ class OrElseSupplierInvocationFactory extends InvocationFactory { private final long mCount; private final SupplierDecorator mOutputSupplier; /** * Constructor. * * @param count the loop count. * @param outputSupplier the supplier instance. */ OrElseSupplierInvocationFactory(final long count, @NotNull final SupplierDecorator outputSupplier) { super(asArgs(ConstantConditions.positive("count number", count), ConstantConditions.notNull("supplier instance", outputSupplier))); mCount = count; mOutputSupplier = outputSupplier; } @NotNull @Override public Invocation newInvocation() { return new OrElseConsumerInvocation(mCount, mOutputSupplier); } /** * Invocation employing a supplier to generate outputs when no one has been received. * * @param the data type. */ private static class OrElseConsumerInvocation extends TemplateInvocation { private final long mCount; private final SupplierDecorator mOutputSupplier; private boolean mHasOutputs; /** * Constructor. * * @param count the loop count. * @param outputSupplier the supplier instance. */ OrElseConsumerInvocation(final long count, @NotNull final SupplierDecorator outputSupplier) { mCount = count; mOutputSupplier = outputSupplier; } public void onComplete(@NotNull final Channel result) throws Exception { if (!mHasOutputs) { final long count = mCount; final SupplierDecorator supplier = mOutputSupplier; for (long i = 0; i < count; ++i) { result.pass(supplier.get()); } } } @Override public void onInput(final DATA input, @NotNull final Channel result) { mHasOutputs = true; result.pass(input); } @Override public void onRestart() { mHasOutputs = false; } } }





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