CallsTelemetry.java 文件源码

public void recordCall(String endpoint) {
    String now = newTimestamp();
    Queue<String> timestamps = callTimestamps.get(endpoint);
    if (timestamps == null) {
        Queue<String> newTimestamps = new ConcurrentLinkedQueue<>();
        timestamps = callTimestamps.putIfAbsent(endpoint, newTimestamps);
        if (timestamps == null) {
            timestamps = newTimestamps;
        }
    }
    timestamps.add(now);
}