Get average stock price every 10 minutes

Write a class that displays average of stock prices for a given stock symbol for the last 10 minutes. We have a service that sends stock updates about 5000 times per second. The structure of the message is :

Message {
long timestamp;
String symbol; // E.g. AAPL
double price;
}
Idea: Use a buffer that has the capacity of 5000 * 60 * 10 messages. Then insert all the messages in to this buffer if the buffer has extra capacity. if the buffer is full, remove from the head and insert new messages from the tail. When the get average price is called, we calculate all the messages in this buffer.

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