com.netflix.spinnaker.clouddriver.aws.security.sdkclient.RateLimitingRequestHandler.java Source code

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Here is the source code for com.netflix.spinnaker.clouddriver.aws.security.sdkclient.RateLimitingRequestHandler.java

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/*
 * Copyright 2016 Netflix, 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.netflix.spinnaker.clouddriver.aws.security.sdkclient;

import com.amazonaws.Request;
import com.amazonaws.handlers.RequestHandler2;
import com.google.common.util.concurrent.RateLimiter;
import com.netflix.spectator.api.Counter;

import static java.util.Objects.requireNonNull;

/**
 * A RequestHandler that will throttle requests via the supplied RateLimiter.
 */
public class RateLimitingRequestHandler extends RequestHandler2 {
    private final Counter counter;
    private final RateLimiter rateLimiter;

    public RateLimitingRequestHandler(Counter counter, RateLimiter rateLimiter) {
        this.counter = requireNonNull(counter);
        this.rateLimiter = requireNonNull(rateLimiter);
    }

    @Override
    public void beforeRequest(Request<?> request) {
        double rateLimitedSeconds = rateLimiter.acquire();
        long rateLimitedMillis = Double.valueOf(rateLimitedSeconds * 1000).longValue();
        counter.increment(rateLimitedMillis);
        super.beforeRequest(request);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;

        RateLimitingRequestHandler that = (RateLimitingRequestHandler) o;

        if (!counter.equals(that.counter))
            return false;
        return rateLimiter.equals(that.rateLimiter);
    }

    @Override
    public int hashCode() {
        int result = counter.hashCode();
        result = 31 * result + rateLimiter.hashCode();
        return result;
    }
}