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The AWS Java SDK for Amazon SQS module holds the client classes that are used for communicating with Amazon Simple Queue Service
/*
* Copyright 2012-2016 Amazon.com, Inc. or its affiliates. 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.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 com.amazonaws.services.sqs.buffered;
import com.amazonaws.AmazonClientException;
public class QueueBufferConfig {
public static final int MAX_BATCH_SIZE_DEFAULT = 10;
/** the maximum number of entries in a batch command */
private int maxBatchSize;
/** Updated as the service now supports messages of size max 256 KiB. */
public static final long SERVICE_MAX_BATCH_SIZE_BYTES = 256 * 1024 - 1;
/**
* The maximum time (milliseconds) a send batch is held open for additional outbound requests.
* The longer this timeout, the longer messages wait for other messages to be added to the
* batch. Increasing this timeout reduces the number of calls made and increases throughput, but
* also increases average message latency.
*/
private long maxBatchOpenMs;
/** 200 milliseconds */
public static final long MAX_BATCH_OPEN_MS_DEFAULT = 200;
/**
* Should we use long polling or not?
*/
private boolean longPoll;
/** true */
private static final boolean LONG_POLL_DEFAULT = true;
/**
* The maximum number of concurrent batches for each type of outbound request. The greater the
* number, the greater the throughput that can be achieved (at the expense of consuming more
* threads).
*/
private int maxInflightOutboundBatches;
/** 5 batches */
public static final int MAX_INFLIGHT_OUTBOUND_BATCHES_DEFAULT = 5;
/**
* The maximum number of concurrent receive message batches. The greater this number, the faster
* the queue will be pulling messages from the SQS servers (at the expense of consuming more
* threads).
*/
private int maxInflightReceiveBatches;
/** 10 batches */
public static final int MAX_INFLIGHT_RECEIVE_BATCHES_DEFAULT = 10;
/**
* If more than that number of completed receive batches are waiting in the buffer, the querying
* for new messages will stop. The larger this number, the more messages the buffer queue will
* pre-fetch and keep in the buffer on the client side, and the faster receive requests will be
* satisfied. The visibility timeout of a pre-fetched message starts at the point of pre-fetch,
* which means that while the message is in the local buffer it is unavailable for other clients
* to process, and when this client retrieves it, part of the visibility timeout may have
* already expired. The number of messages prefetched will not exceed maxBatchSize *
* maxDoneReceiveBatches.
*/
private int maxDoneReceiveBatches;
/** 10 batches */
public static final int MAX_DONE_RECEIVE_BATCHES_DEFAULT = 10;
/**
* Maximum permitted size of a SendMessage or SendMessageBatch message, in bytes
*/
private long maxBatchSizeBytes;
/** 256 kilobytes */
public static final long MAX_BATCH_SIZE_BYTES_DEFAULT = SERVICE_MAX_BATCH_SIZE_BYTES;
/**
* Custom visibility timeout to use when retrieving messages from SQS. If set to a value greater
* than zero, this timeout will override the default visibility timeout set on the SQS queue.
* Set it to -1 to use the default visiblity timeout of the queue. Visibility timeout of 0
* seconds is not supported.
*/
private int visibilityTimeoutSeconds;
/** -1, which means use the visibility timeout of the queue */
public static final int VISIBILITY_TIMEOUT_SECONDS_DEFAULT = -1;
/**
* Specifies the amount of time, in seconds, the receive call will block on the server waiting
* for messages to arrive if the queue is empty when the receive call is first made. This
* setting has no effect if long polling is disabled.
*/
private int longPollWaitTimeoutSeconds;
public static final int LONGPOLL_WAIT_TIMEOUT_SECONDS_DEFAULT = 20;
public QueueBufferConfig(long maxBatchOpenMs, int maxInflightOutboundBatches, int maxInflightReceiveBatches,
int maxDoneReceiveBatches, boolean paramLongPoll, long maxBatchSizeBytes, int visibilityTimeout,
int longPollTimeout, int maxBatch) {
super();
this.maxBatchOpenMs = maxBatchOpenMs;
this.maxInflightOutboundBatches = maxInflightOutboundBatches;
this.maxInflightReceiveBatches = maxInflightReceiveBatches;
this.maxDoneReceiveBatches = maxDoneReceiveBatches;
this.longPoll = paramLongPoll;
this.maxBatchSizeBytes = maxBatchSizeBytes;
this.visibilityTimeoutSeconds = visibilityTimeout;
this.longPollWaitTimeoutSeconds = longPollTimeout;
this.maxBatchSize = maxBatch;
}
public QueueBufferConfig() {
this(MAX_BATCH_OPEN_MS_DEFAULT, MAX_INFLIGHT_OUTBOUND_BATCHES_DEFAULT, MAX_INFLIGHT_RECEIVE_BATCHES_DEFAULT,
MAX_DONE_RECEIVE_BATCHES_DEFAULT, LONG_POLL_DEFAULT, MAX_BATCH_SIZE_BYTES_DEFAULT,
VISIBILITY_TIMEOUT_SECONDS_DEFAULT, LONGPOLL_WAIT_TIMEOUT_SECONDS_DEFAULT, MAX_BATCH_SIZE_DEFAULT);
}
/** copy constructor */
public QueueBufferConfig(QueueBufferConfig other) {
longPoll = other.longPoll;
longPollWaitTimeoutSeconds = other.longPollWaitTimeoutSeconds;
maxBatchOpenMs = other.maxBatchOpenMs;
maxBatchSize = other.maxBatchSize;
maxBatchSizeBytes = other.maxBatchSizeBytes;
maxDoneReceiveBatches = other.maxDoneReceiveBatches;
maxInflightOutboundBatches = other.maxInflightOutboundBatches;
maxInflightReceiveBatches = other.maxInflightReceiveBatches;
visibilityTimeoutSeconds = other.visibilityTimeoutSeconds;
}
@Override
public String toString() {
return "QueueBufferConfig [maxBatchSize=" + maxBatchSize + ", maxBatchOpenMs=" + maxBatchOpenMs + ", longPoll="
+ longPoll + ", maxInflightOutboundBatches=" + maxInflightOutboundBatches
+ ", maxInflightReceiveBatches=" + maxInflightReceiveBatches + ", maxDoneReceiveBatches="
+ maxDoneReceiveBatches + ", maxBatchSizeBytes=" + maxBatchSizeBytes + ", visibilityTimeoutSeconds="
+ visibilityTimeoutSeconds + ", longPollWaitTimeoutSeconds=" + longPollWaitTimeoutSeconds + "]";
}
/**
* The maximum time (milliseconds) a send batch is held open for additional outbound requests.
* The longer this timeout, the longer messages wait for other messages to be added to the
* batch. Increasing this timeout reduces the number of calls made and increases throughput, but
* also increases average message latency.
*/
public long getMaxBatchOpenMs() {
return maxBatchOpenMs;
}
/**
* The maximum time (milliseconds) a send batch is held open for additional outbound requests.
* The longer this timeout, the longer messages wait for other messages to be added to the
* batch. Increasing this timeout reduces the number of calls made and increases throughput, but
* also increases average message latency.
*/
public void setMaxBatchOpenMs(long maxBatchOpenMs) {
this.maxBatchOpenMs = maxBatchOpenMs;
}
/**
* The maximum time (milliseconds) a send batch is held open for additional outbound requests.
* The longer this timeout, the longer messages wait for other messages to be added to the
* batch. Increasing this timeout reduces the number of calls made and increases throughput, but
* also increases average message latency.
*/
public QueueBufferConfig withMaxBatchOpenMs(long maxBatchOpenMs) {
setMaxBatchOpenMs(maxBatchOpenMs);
return this;
}
/**
* @return true if the queue buffer will use long polling while retrieving messages from the
* SQS server, false otherwise.
*/
public boolean isLongPoll() {
return longPoll;
}
/**
* Specify "true" for receive requests to use long polling.
*/
public void setLongPoll(boolean longPoll) {
this.longPoll = longPoll;
}
/**
* Specify "true" for receive requests to use long polling.
*/
public QueueBufferConfig withLongPoll(boolean longPoll) {
setLongPoll(longPoll);
return this;
}
/**
* The maximum number of concurrent batches for each type of outbound request. The greater the
* number, the greater the throughput that can be achieved (at the expense of consuming more
* threads).
*/
public int getMaxInflightOutboundBatches() {
return maxInflightOutboundBatches;
}
/**
* The maximum number of concurrent batches for each type of outbound request. The greater the
* number, the greater the throughput that can be achieved (at the expense of consuming more
* threads).
*/
public void setMaxInflightOutboundBatches(int maxInflightOutboundBatches) {
this.maxInflightOutboundBatches = maxInflightOutboundBatches;
}
/**
* The maximum number of concurrent batches for each type of outbound request. The greater the
* number, the greater the throughput that can be achieved (at the expense of consuming more
* threads).
*/
public QueueBufferConfig withMaxInflightOutboundBatches(int maxInflightOutboundBatches) {
setMaxInflightOutboundBatches(maxInflightOutboundBatches);
return this;
}
/**
* The maximum number of concurrent receive message batches. The greater this number, the faster
* the queue will be pulling messages from the SQS servers (at the expense of consuming more
* threads).
*/
public int getMaxInflightReceiveBatches() {
return maxInflightReceiveBatches;
}
/**
* The maximum number of concurrent receive message batches. The greater this number, the faster
* the queue will be pulling messages from the SQS servers (at the expense of consuming more
* threads).
*/
public void setMaxInflightReceiveBatches(int maxInflightReceiveBatches) {
this.maxInflightReceiveBatches = maxInflightReceiveBatches;
}
/**
* The maximum number of concurrent receive message batches. The greater this number, the faster
* the queue will be pulling messages from the SQS servers (at the expense of consuming more
* threads).
*/
public QueueBufferConfig withMaxInflightReceiveBatches(int maxInflightReceiveBatches) {
setMaxInflightReceiveBatches(maxInflightReceiveBatches);
return this;
}
/**
* If more than that number of completed receive batches are waiting in the buffer, the querying
* for new messages will stop.
* The larger this number, the more messages the queue buffer will pre-fetch and keep in the
* buffer on the client side, and the faster receive requests will be satisfied.
* The visibility timeout of a pre-fetched message starts at the point of pre-fetch, which means
* that while the message is in the local buffer it is unavailable for other clients to process,
* and when this client retrieves it, part of the visibility timeout may have already expired.
* The number of messages prefetched will not exceed 10 * maxDoneReceiveBatches, as there can be
* a maximum of 10 messages per batch.
*/
public int getMaxDoneReceiveBatches() {
return maxDoneReceiveBatches;
}
/**
* If more than that number of completed receive batches are waiting in the buffer, the querying
* for new messages will stop. The larger this number, the more messages the buffer queue will
* pre-fetch and keep in the buffer on the client side, and the faster receive requests will be
* satisfied. The visibility timeout of a pre-fetched message starts at the point of pre-fetch,
* which means that while the message is in the local buffer it is unavailable for other clients
* to process, and when this client retrieves it, part of the visibility timeout may have
* already expired. The number of messages prefetched will not exceed maxBatchSize *
* maxDoneReceiveBatches.
*/
public void setMaxDoneReceiveBatches(int maxDoneReceiveBatches) {
this.maxDoneReceiveBatches = maxDoneReceiveBatches;
}
/**
* If more than that number of completed receive batches are waiting in the buffer, the querying
* for new messages will stop. The larger this number, the more messages the buffer queue will
* pre-fetch and keep in the buffer on the client side, and the faster receive requests will be
* satisfied. The visibility timeout of a pre-fetched message starts at the point of pre-fetch,
* which means that while the message is in the local buffer it is unavailable for other clients
* to process, and when this client retrieves it, part of the visibility timeout may have
* already expired. The number of messages prefetched will not exceed maxBatchSize *
* maxDoneReceiveBatches.
*/
public QueueBufferConfig withMaxDoneReceiveBatches(int maxDoneReceiveBatches) {
setMaxDoneReceiveBatches(maxDoneReceiveBatches);
return this;
}
/**
* Maximum permitted size of a SendMessage or SendMessageBatch message, in bytes. This setting
* is also enforced on the server, and if this client submits a request of a size larger than
* the server can support, the server will reject the request.
*/
public long getMaxBatchSizeBytes() {
return maxBatchSizeBytes;
}
/**
* Maximum permitted size of a SendMessage or SendMessageBatch message, in bytes. This setting
* is also enforced on the server, and if this client submits a request of a size larger than
* the server can support, the server will reject the request.
*
* @throws IllegalArgumentException
* if the size being set is greater than the service allowed size for message body.
*/
public void setMaxBatchSizeBytes(long maxBatchSizeBytes) {
if (maxBatchSizeBytes > SERVICE_MAX_BATCH_SIZE_BYTES) {
throw new IllegalArgumentException(
"Maximum Size of the message cannot be greater than the allowed limit of "
+ SERVICE_MAX_BATCH_SIZE_BYTES + " bytes");
}
this.maxBatchSizeBytes = maxBatchSizeBytes;
}
/**
* Maximum permitted size of a SendMessage or SendMessageBatch message, in bytes. This setting
* is also enforced on the server, and if this client submits a request of a size larger than
* the server can support, the server will reject the request.
*
* @throws IllegalArgumentException
* if the size being set is greater than the service allowed size for message body.
*/
public QueueBufferConfig withMaxBatchSizeBytes(long maxBatchSizeBytes) {
setMaxBatchSizeBytes(maxBatchSizeBytes);
return this;
}
/**
* Custom visibility timeout to use when retrieving messages from SQS. If set to a value greater
* than zero, this timeout will override the default visibility timeout set on the SQS queue.
* Set it to -1 to use the default visiblity timeout of the queue. Visibility timeout of 0
* seconds is not supported.
*/
public int getVisibilityTimeoutSeconds() {
return visibilityTimeoutSeconds;
}
/**
* Custom visibility timeout to use when retrieving messages from SQS. If set to a value greater
* than zero, this timeout will override the default visibility timeout set on the SQS queue.
* Set it to -1 to use the default visiblity timeout of the queue. Visibility timeout of 0
* seconds is not supported.
*/
public void setVisibilityTimeoutSeconds(int visibilityTimeoutSeconds) {
this.visibilityTimeoutSeconds = visibilityTimeoutSeconds;
}
/**
* Custom visibility timeout to use when retrieving messages from SQS. If set to a value greater
* than zero, this timeout will override the default visibility timeout set on the SQS queue.
* Set it to -1 to use the default visiblity timeout of the queue. Visibility timeout of 0
* seconds is not supported.
*/
public QueueBufferConfig withVisibilityTimeoutSeconds(int visibilityTimeoutSeconds) {
setVisibilityTimeoutSeconds(visibilityTimeoutSeconds);
return this;
}
/**
* Specifies the amount of time, in seconds, the receive call will block on the server waiting
* for messages to arrive if the queue is empty when the receive call is first made. This
* setting has no effect if long polling is disabled.
*/
public void setLongPollWaitTimeoutSeconds(int longPollWaitTimeoutSeconds) {
this.longPollWaitTimeoutSeconds = longPollWaitTimeoutSeconds;
}
/**
* Specifies the amount of time, in seconds, the receive call will block on the server waiting
* for messages to arrive if the queue is empty when the receive call is first made. This
* setting has no effect if long polling is disabled.
*/
public int getLongPollWaitTimeoutSeconds() {
return longPollWaitTimeoutSeconds;
}
/**
* Specifies the amount of time, in seconds, the receive call will block on the server waiting
* for messages to arrive if the queue is empty when the receive call is first made. This
* setting has no effect if long polling is disabled.
*/
public QueueBufferConfig withLongPollWaitTimeoutSeconds(int longPollWaitTimeoutSeconds) {
setLongPollWaitTimeoutSeconds(longPollWaitTimeoutSeconds);
return this;
}
/**
* Specifies the maximum number of entries the buffered client will put in a single batch
* request.
*/
public int getMaxBatchSize() {
return maxBatchSize;
}
/**
* Specifies the maximum number of entries the buffered client will put in a single batch
* request.
*/
public void setMaxBatchSize(int maxBatchSize) {
this.maxBatchSize = maxBatchSize;
}
/**
* Specifies the maximum number of entries the buffered client will put in a single batch
* request.
*/
public QueueBufferConfig withMaxBatchSize(int maxBatchSize) {
setMaxBatchSize(maxBatchSize);
return this;
}
/**
* this method checks the config for validity. If the config is deemed to be invalid, an
* informative exception is thrown.
*
* @throws AmazonClientException
* with a message explaining why the config was invalid
*/
void validate() {
if (visibilityTimeoutSeconds == 0) {
throw new AmazonClientException("Visibility timeout value may not be equal to zero ");
}
}
}
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