com.lithium.flow.util.LimiterInputStream Maven / Gradle / Ivy

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/*
 * Copyright 2020 Lithium Technologies, Inc.
 *
 * 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.lithium.flow.util;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.annotation.Nonnull;

import com.google.common.util.concurrent.RateLimiter;

/**
 * @author Matt Ayres
 */
public class LimiterInputStream extends FilterInputStream {
	private final RateLimiter limiter;

	public LimiterInputStream(@Nonnull InputStream in, @Nonnull RateLimiter limiter) {
		super(checkNotNull(in));
		this.limiter = checkNotNull(limiter);
	}

	@Override
	public int read() throws IOException {
		int read = in.read();
		limiter.acquire();
		return read;
	}

	@Override
	public int read(@Nonnull byte[] b) throws IOException {
		int read = in.read(b);
		limiter.acquire(read);
		return read;
	}

	@Override
	public int read(@Nonnull byte[] b, int off, int len) throws IOException {
		int read = in.read(b, off, len);
		limiter.acquire(read);
		return read;
	}
}