| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE |
| * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file |
| * to You 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 org.apache.kafka.clients; |
| |
| import java.util.ArrayDeque; |
| import java.util.Collections; |
| import java.util.Deque; |
| import java.util.HashMap; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * The set of requests which have been sent or are being sent but haven't yet received a response |
| */ |
| final class InFlightRequests { |
| |
| private final int maxInFlightRequestsPerConnection; |
| private final Map<String, Deque<ClientRequest>> requests = new HashMap<String, Deque<ClientRequest>>(); |
| |
| public InFlightRequests(int maxInFlightRequestsPerConnection) { |
| this.maxInFlightRequestsPerConnection = maxInFlightRequestsPerConnection; |
| } |
| |
| /** |
| * Add the given request to the queue for the connection it was directed to |
| */ |
| public void add(ClientRequest request) { |
| Deque<ClientRequest> reqs = this.requests.get(request.request().destination()); |
| if (reqs == null) { |
| reqs = new ArrayDeque<>(); |
| this.requests.put(request.request().destination(), reqs); |
| } |
| reqs.addFirst(request); |
| } |
| |
| /** |
| * Get the request queue for the given node |
| */ |
| private Deque<ClientRequest> requestQueue(String node) { |
| Deque<ClientRequest> reqs = requests.get(node); |
| if (reqs == null || reqs.isEmpty()) |
| throw new IllegalStateException("Response from server for which there are no in-flight requests."); |
| return reqs; |
| } |
| |
| /** |
| * Get the oldest request (the one that that will be completed next) for the given node |
| */ |
| public ClientRequest completeNext(String node) { |
| return requestQueue(node).pollLast(); |
| } |
| |
| /** |
| * Get the last request we sent to the given node (but don't remove it from the queue) |
| * @param node The node id |
| */ |
| public ClientRequest lastSent(String node) { |
| return requestQueue(node).peekFirst(); |
| } |
| |
| /** |
| * Complete the last request that was sent to a particular node. |
| * @param node The node the request was sent to |
| * @return The request |
| */ |
| public ClientRequest completeLastSent(String node) { |
| return requestQueue(node).pollFirst(); |
| } |
| |
| /** |
| * Can we send more requests to this node? |
| * |
| * @param node Node in question |
| * @return true iff we have no requests still being sent to the given node |
| */ |
| public boolean canSendMore(String node) { |
| Deque<ClientRequest> queue = requests.get(node); |
| return queue == null || queue.isEmpty() || |
| (queue.peekFirst().request().completed() && queue.size() < this.maxInFlightRequestsPerConnection); |
| } |
| |
| /** |
| * Return the number of inflight requests directed at the given node |
| * @param node The node |
| * @return The request count. |
| */ |
| public int inFlightRequestCount(String node) { |
| Deque<ClientRequest> queue = requests.get(node); |
| return queue == null ? 0 : queue.size(); |
| } |
| |
| /** |
| * Count all in-flight requests for all nodes |
| */ |
| public int inFlightRequestCount() { |
| int total = 0; |
| for (Deque<ClientRequest> deque : this.requests.values()) |
| total += deque.size(); |
| return total; |
| } |
| |
| /** |
| * Clear out all the in-flight requests for the given node and return them |
| * |
| * @param node The node |
| * @return All the in-flight requests for that node that have been removed |
| */ |
| public Iterable<ClientRequest> clearAll(String node) { |
| Deque<ClientRequest> reqs = requests.get(node); |
| if (reqs == null) { |
| return Collections.emptyList(); |
| } else { |
| return requests.remove(node); |
| } |
| } |
| |
| /** |
| * Returns a list of nodes with pending inflight request, that need to be timed out |
| * |
| * @param now current time in milliseconds |
| * @param requestTimeout max time to wait for the request to be completed |
| * @return list of nodes |
| */ |
| public List<String> getNodesWithTimedOutRequests(long now, int requestTimeout) { |
| List<String> nodeIds = new LinkedList<String>(); |
| for (String nodeId : requests.keySet()) { |
| if (inFlightRequestCount(nodeId) > 0) { |
| ClientRequest request = requests.get(nodeId).peekLast(); |
| long timeSinceSend = now - request.sendTimeMs(); |
| if (timeSinceSend > requestTimeout) { |
| nodeIds.add(nodeId); |
| } |
| } |
| } |
| |
| return nodeIds; |
| } |
| } |