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Add RequestSendType.ROUND_ROBIN for per-request IP round-robin #2202
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pavel-ptashyts
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51 changes: 51 additions & 0 deletions
51
client/src/main/java/org/asynchttpclient/RequestSendType.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * Copyright (c) 2024 AsyncHttpClient Project. All rights reserved. | ||
| * | ||
| * 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 org.asynchttpclient; | ||
|
|
||
| /** | ||
| * Controls how requests are dispatched to a host that resolves to several IP addresses. | ||
| * | ||
| * <p>Configured globally through {@link AsyncHttpClientConfig#getRequestSendType()}. | ||
| */ | ||
| public enum RequestSendType { | ||
|
|
||
| /** | ||
| * Default behavior. The address list returned by DNS is used in its natural order: a new | ||
| * connection always targets the first address and only falls back to the next one when a TCP | ||
| * connection attempt fails. Combined with connection pooling (keyed by host), this means that | ||
| * with keep-alive enabled essentially all traffic to a host stays on the first reachable IP. | ||
| */ | ||
| DEFAULT, | ||
|
|
||
| /** | ||
| * Strict per-request round-robin across the host's resolved IPs. | ||
| * | ||
| * <p>For each request, the client rotates which resolved IP is targeted first (TCP failover to | ||
| * the remaining IPs is preserved) and makes connection reuse IP-aware, so that pooled HTTP/1.1 | ||
| * connections and multiplexed HTTP/2 connections are kept and reused per IP rather than per | ||
| * host. The net effect is that consecutive requests to a multi-IP host are spread evenly across | ||
| * all of its addresses, even when connections are kept alive. | ||
| * | ||
| * <p>Notes: | ||
| * <ul> | ||
| * <li>Has no effect for hosts that resolve to a single address, literal-IP hosts, requests | ||
| * with an explicit {@link Request#getAddress() address}, or requests routed through an | ||
| * HTTP proxy (the proxy host is resolved, not the target).</li> | ||
| * <li>Connection limits ({@code maxConnectionsPerHost}) remain per host, not per IP.</li> | ||
| * </ul> | ||
| */ | ||
| ROUND_ROBIN | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -15,11 +15,13 @@ | |
| */ | ||
| package org.asynchttpclient.config; | ||
|
|
||
| import org.asynchttpclient.RequestSendType; | ||
| import org.jetbrains.annotations.Nullable; | ||
|
|
||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.time.Duration; | ||
| import java.util.Locale; | ||
| import java.util.Properties; | ||
|
|
||
| public final class AsyncHttpClientConfigDefaults { | ||
|
|
@@ -52,6 +54,7 @@ public final class AsyncHttpClientConfigDefaults { | |
| public static final String STRICT_302_HANDLING_CONFIG = "strict302Handling"; | ||
| public static final String KEEP_ALIVE_CONFIG = "keepAlive"; | ||
| public static final String MAX_REQUEST_RETRY_CONFIG = "maxRequestRetry"; | ||
| public static final String REQUEST_SEND_TYPE_CONFIG = "requestSendType"; | ||
| public static final String DISABLE_URL_ENCODING_FOR_BOUND_REQUESTS_CONFIG = "disableUrlEncodingForBoundRequests"; | ||
| public static final String USE_LAX_COOKIE_ENCODER_CONFIG = "useLaxCookieEncoder"; | ||
| public static final String USE_OPEN_SSL_CONFIG = "useOpenSsl"; | ||
|
|
@@ -373,4 +376,16 @@ public static Duration defaultHttp2PingInterval() { | |
| public static boolean defaultHttp2CleartextEnabled() { | ||
| return AsyncHttpClientConfigHelper.getAsyncHttpClientConfig().getBoolean(ASYNC_CLIENT_CONFIG_ROOT + HTTP2_CLEARTEXT_ENABLED_CONFIG); | ||
| } | ||
|
|
||
| public static RequestSendType defaultRequestSendType() { | ||
| String value = AsyncHttpClientConfigHelper.getAsyncHttpClientConfig().getString(ASYNC_CLIENT_CONFIG_ROOT + REQUEST_SEND_TYPE_CONFIG); | ||
| if (value == null || value.trim().isEmpty()) { | ||
| return RequestSendType.DEFAULT; | ||
| } | ||
| try { | ||
| return RequestSendType.valueOf(value.trim().toUpperCase(Locale.ROOT)); | ||
| } catch (IllegalArgumentException e) { | ||
|
Member
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Quietly falling back to DEFAULT when the value doesn't parse will hide typos in someone's config. A warning log that includes the bad value would make that a lot easier to spot. |
||
| return RequestSendType.DEFAULT; | ||
| } | ||
| } | ||
| } | ||
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