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/*
* Copyright (C) 2011 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.
*/
package com.android.volley;
/** Default retry policy for requests. */
public class DefaultRetryPolicy implements RetryPolicy {
/** The current timeout in milliseconds. */
private int mCurrentTimeoutMs;
/** The current retry count. */
private int mCurrentRetryCount;
/** The maximum number of attempts. */
private final int mMaxNumRetries;
/** The backoff multiplier for the policy. */
private final float mBackoffMultiplier;
/** The default socket timeout in milliseconds */
public static final int DEFAULT_TIMEOUT_MS = 2500;
/** The default number of retries */
public static final int DEFAULT_MAX_RETRIES = 1;
/** The default backoff multiplier */
public static final float DEFAULT_BACKOFF_MULT = 1f;
/** Constructs a new retry policy using the default timeouts. */
public DefaultRetryPolicy() {
this(DEFAULT_TIMEOUT_MS, DEFAULT_MAX_RETRIES, DEFAULT_BACKOFF_MULT);
}
/**
* Constructs a new retry policy.
*
* @param initialTimeoutMs The initial timeout for the policy.
* @param maxNumRetries The maximum number of retries.
* @param backoffMultiplier Backoff multiplier for the policy.
*/
public DefaultRetryPolicy(int initialTimeoutMs, int maxNumRetries, float backoffMultiplier) {
mCurrentTimeoutMs = initialTimeoutMs;
mMaxNumRetries = maxNumRetries;
mBackoffMultiplier = backoffMultiplier;
}
/** Returns the current timeout. */
@Override
public int getCurrentTimeout() {
return mCurrentTimeoutMs;
}
/** Returns the current retry count. */
@Override
public int getCurrentRetryCount() {
return mCurrentRetryCount;
}
/** Returns the backoff multiplier for the policy. */
public float getBackoffMultiplier() {
return mBackoffMultiplier;
}
/**
* Prepares for the next retry by applying a backoff to the timeout.
*
* @param error The error code of the last attempt.
*/
@Override
public void retry(VolleyError error) throws VolleyError {
mCurrentRetryCount++;
mCurrentTimeoutMs += (int) (mCurrentTimeoutMs * mBackoffMultiplier);
if (!hasAttemptRemaining()) {
throw error;
}
}
/** Returns true if this policy has attempts remaining, false otherwise. */
protected boolean hasAttemptRemaining() {
return mCurrentRetryCount <= mMaxNumRetries;
}
}
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