org.wisdom.api.concurrent.CompositeExecutionContext Maven / Gradle / Ivy
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* Wisdom-Framework
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* Copyright (C) 2013 - 2015 Wisdom Framework
* %%
* 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
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*/
package org.wisdom.api.concurrent;
import com.google.common.collect.ImmutableList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
/**
* An implementation of {@link org.wisdom.api.concurrent.ExecutionContext} that
* results from the composition of several individual
* {@link org.wisdom.api.concurrent.ExecutionContext}. It's application is the
* application of all the composed context.
*
* The set of {@link org.wisdom.api.concurrent.ExecutionContext} composing an
* instance of {@link org.wisdom.api.concurrent.CompositeExecutionContext}
* cannot be changed after creation.
*/
public class CompositeExecutionContext implements ExecutionContext {
private Collection elements = ImmutableList.of();
private CompositeExecutionContext() {
// Avoid direct instantiation.
}
/**
* Creates an instance of {@link CompositeExecutionContext} composed by the
* given {@link org.wisdom.api.concurrent.ExecutionContext}.
*
* @param contexts the elements that are going to compose the composite
* @return the composite context
*/
public static CompositeExecutionContext create(ExecutionContext... contexts) {
return create(Arrays.asList(contexts));
}
/**
* Creates an instance of {@link CompositeExecutionContext} composed by the
* given {@link org.wisdom.api.concurrent.ExecutionContext}.
*
* @param contexts the elements that are going to compose the composite
* @return the composite context
*/
public static CompositeExecutionContext create(List contexts) {
return new CompositeExecutionContext().addAll(contexts);
}
/**
* Sets the composing context.
*
* @param contexts the elements
* @return the current instance
*/
private CompositeExecutionContext addAll(List contexts) {
this.elements = new ImmutableList.Builder().addAll(contexts).build();
return this;
}
/**
* Applies the execution context.
* It applies the different composing context in the order they were given.
*/
@Override
public void apply() {
for (ExecutionContext context : elements) {
context.apply();
}
}
/**
* Un-applies the execution context.
* It un-applies the different composing context in the order they were given.
*/
@Override
public void unapply() {
for (ExecutionContext context : elements) {
context.unapply();
}
}
}