SimpleIdlingResource.java

package com.llamacorp.equate.view.IdlingResource;

/*
 * Copyright 2016, The Android Open Source Project
 *
 * 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.
 */

import android.support.annotation.Nullable;
import android.support.test.espresso.IdlingResource;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * A very simple implementation of {@link IdlingResource}.
 * <p>
 * Consider using CountingIdlingResource from espresso-contrib package if you use this class from
 * multiple threads or need to keep a count of pending operations.
 */

public class SimpleIdlingResource implements IdlingResource {

	@Nullable
	private volatile ResourceCallback mCallback;

	// Idleness is controlled with this boolean.
	private AtomicBoolean mIsIdleNow = new AtomicBoolean(true);

	@Override
	public String getName() {
		return this.getClass().getName();
	}

	@Override
	public boolean isIdleNow() {
		return mIsIdleNow.get();
	}

	@Override
	public void registerIdleTransitionCallback(ResourceCallback callback) {
		mCallback = callback;
	}

	/**
	 * Sets the new idle state, if isIdleNow is true, it pings the {@link ResourceCallback}.
	 *
	 * @param isIdleNow false if there are pending operations, true if idle.
	 */
	public void setIdleState(boolean isIdleNow) {
		mIsIdleNow.set(isIdleNow);
		if (isIdleNow && mCallback != null){
			mCallback.onTransitionToIdle();
		}
	}
}