| //// |
| 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 |
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| //// |
| |
| // This assembly is included in the following assemblies: |
| // |
| // understanding-message-routing.adoc |
| |
| [id='message-routing-flow-control-{context}'] |
| = Message routing flow control |
| |
| {RouterName} uses a _credit-based_ flow control mechanism to ensure that producers can only send messages to a router if at least one consumer is available to receive them. Because {RouterName} does not store messages, this credit-based flow control prevents producers from sending messages when there are no consumers present. |
| |
| A client wishing to send a message to the router must wait until the router has provided it with credit. Attempting to publish a message without credit available will cause the client to block. Once credit is made available, the client will unblock, and the message will be sent to the router. |
| |
| NOTE: Most AMQP client libraries enable you to determine the amount of credit available to a producer. For more information, consult your client's documentation. |