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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus;
/**
* This is an implementation of the {@link ThrottlePolicy} that offers static limits to the amount of pending data a
* {@link SourceSession} is allowed to have. You may choose to set a limit to the total number of pending messages (by
* way of {@link #setMaxPendingCount(int)}), the total size of pending messages (by way of {@link
* #setMaxPendingSize(long)}), or some combination thereof.
*
* <b>NOTE:</b> By context, "pending" refers to the number of sent messages that have not been replied to yet.
*
* @author Simon Thoresen Hult
*/
public class StaticThrottlePolicy implements ThrottlePolicy {
private int maxPendingCount = 0;
private long maxPendingSize = 0;
private long pendingSize = 0;
@Override
public boolean canSend(Message message, int pendingCount) {
if (maxPendingCount > 0 && pendingCount >= maxPendingCount) {
return false;
}
if (maxPendingSize > 0 && pendingSize >= maxPendingSize) {
return false;
}
return true;
}
@Override
public void processMessage(Message message) {
int size = message.getApproxSize();
message.setContext(size);
pendingSize += size;
}
@Override
public void processReply(Reply reply) {
int size = (Integer)reply.getContext();
pendingSize -= size;
}
/**
* Returns the maximum number of pending messages allowed.
*
* @return the max limit
*/
public int getMaxPendingCount() {
return maxPendingCount;
}
/**
* Sets the maximum number of pending messages allowed.
*
* @param maxCount The max count
* @return this, to allow chaining
*/
public StaticThrottlePolicy setMaxPendingCount(int maxCount) {
maxPendingCount = maxCount;
return this;
}
/**
* Returns the maximum total size of pending messages allowed.
*
* @return The max limit.
*/
public long getMaxPendingSize() {
return maxPendingSize;
}
/**
* Sets the maximum total size of pending messages allowed. This size is relative to the value returned by {@link
* com.yahoo.messagebus.Message#getApproxSize()}.
*
* @param maxSize The max size.
* @return This, to allow chaining.
*/
public StaticThrottlePolicy setMaxPendingSize(long maxSize) {
maxPendingSize = maxSize;
return this;
}
/**
* Returns the total size of pending messages.
*
* @return The size.
*/
public long getPendingSize() {
return pendingSize;
}
}
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