com.amazonaws.services.kinesis.model.GetRecordsRequest Maven / Gradle / Ivy
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/*
* Copyright 2010-2015 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.kinesis.model;
import java.io.Serializable;
import com.amazonaws.AmazonWebServiceRequest;
/**
* Container for the parameters to the {@link com.amazonaws.services.kinesis.AmazonKinesis#getRecords(GetRecordsRequest) GetRecords operation}.
*
* Gets data records from a shard.
*
*
* Specify a shard iterator using the ShardIterator
* parameter. The shard iterator specifies the position in the shard from
* which you want to start reading data records sequentially. If there
* are no records available in the portion of the shard that the iterator
* points to, GetRecords returns an empty list. Note that it
* might take multiple calls to get to a portion of the shard that
* contains records.
*
*
* You can scale by provisioning multiple shards. Your application should
* have one thread per shard, each reading continuously from its stream.
* To read from a stream continually, call GetRecords in a
* loop. Use GetShardIterator to get the shard iterator to specify in the
* first GetRecords call. GetRecords returns a
* new shard iterator in NextShardIterator .
* Specify the shard iterator returned in
* NextShardIterator in subsequent calls to
* GetRecords .
* Note that if the shard has been closed, the shard iterator
* can't return more data and GetRecords returns
* null in NextShardIterator .
* You can terminate the loop when the shard is closed, or
* when the shard iterator reaches the record with the sequence number or
* other attribute that marks it as the last record to process.
*
*
* Each data record can be up to 50 KB in size, and each shard can read
* up to 2 MB per second. You can ensure that your calls don't exceed the
* maximum supported size or throughput by using the Limit
* parameter to specify the maximum number of records that
* GetRecords can return. Consider your average record size
* when determining this limit. For example, if your average record size
* is 40 KB, you can limit the data returned to about 1 MB per call by
* specifying 25 as the limit.
*
*
* The size of the data returned by GetRecords will vary
* depending on the utilization of the shard. The maximum size of data
* that GetRecords can return is 10 MB. If a call returns 10
* MB of data, subsequent calls made within the next 5 seconds throw
* ProvisionedThroughputExceededException .
* If there is insufficient provisioned throughput on the
* shard, subsequent calls made within the next 1 second throw
* ProvisionedThroughputExceededException .
* Note that GetRecords won't return any data
* when it throws an exception. For this reason, we recommend that you
* wait one second between calls to GetRecords ;
* however, it's possible that the application will get
* exceptions for longer than 1 second.
*
*
* To detect whether the application is falling behind in processing, add
* a timestamp to your records and note how long it takes to process
* them. You can also monitor how much data is in a stream using the
* CloudWatch metrics for write operations ( PutRecord and
* PutRecords ). For more information, see
* Monitoring Amazon Kinesis with Amazon CloudWatch
* in the Amazon Kinesis Developer Guide .
*
*
* @see com.amazonaws.services.kinesis.AmazonKinesis#getRecords(GetRecordsRequest)
*/
public class GetRecordsRequest extends AmazonWebServiceRequest implements Serializable {
/**
* The position in the shard from which you want to start sequentially
* reading data records. A shard iterator specifies this position using
* the sequence number of a data record in the shard.
*
* Constraints:
* Length: 1 - 512
*/
private String shardIterator;
/**
* The maximum number of records to return. Specify a value of up to
* 10,000. If you specify a value that is greater than 10,000,
* GetRecords throws InvalidArgumentException.
*
* Constraints:
* Range: 1 - 10000
*/
private Integer limit;
/**
* The position in the shard from which you want to start sequentially
* reading data records. A shard iterator specifies this position using
* the sequence number of a data record in the shard.
*
* Constraints:
* Length: 1 - 512
*
* @return The position in the shard from which you want to start sequentially
* reading data records. A shard iterator specifies this position using
* the sequence number of a data record in the shard.
*/
public String getShardIterator() {
return shardIterator;
}
/**
* The position in the shard from which you want to start sequentially
* reading data records. A shard iterator specifies this position using
* the sequence number of a data record in the shard.
*
* Constraints:
* Length: 1 - 512
*
* @param shardIterator The position in the shard from which you want to start sequentially
* reading data records. A shard iterator specifies this position using
* the sequence number of a data record in the shard.
*/
public void setShardIterator(String shardIterator) {
this.shardIterator = shardIterator;
}
/**
* The position in the shard from which you want to start sequentially
* reading data records. A shard iterator specifies this position using
* the sequence number of a data record in the shard.
*
* Returns a reference to this object so that method calls can be chained together.
*
* Constraints:
* Length: 1 - 512
*
* @param shardIterator The position in the shard from which you want to start sequentially
* reading data records. A shard iterator specifies this position using
* the sequence number of a data record in the shard.
*
* @return A reference to this updated object so that method calls can be chained
* together.
*/
public GetRecordsRequest withShardIterator(String shardIterator) {
this.shardIterator = shardIterator;
return this;
}
/**
* The maximum number of records to return. Specify a value of up to
* 10,000. If you specify a value that is greater than 10,000,
* GetRecords throws InvalidArgumentException.
*
* Constraints:
* Range: 1 - 10000
*
* @return The maximum number of records to return. Specify a value of up to
* 10,000. If you specify a value that is greater than 10,000,
* GetRecords throws InvalidArgumentException.
*/
public Integer getLimit() {
return limit;
}
/**
* The maximum number of records to return. Specify a value of up to
* 10,000. If you specify a value that is greater than 10,000,
* GetRecords throws InvalidArgumentException.
*
* Constraints:
* Range: 1 - 10000
*
* @param limit The maximum number of records to return. Specify a value of up to
* 10,000. If you specify a value that is greater than 10,000,
* GetRecords throws InvalidArgumentException.
*/
public void setLimit(Integer limit) {
this.limit = limit;
}
/**
* The maximum number of records to return. Specify a value of up to
* 10,000. If you specify a value that is greater than 10,000,
* GetRecords throws InvalidArgumentException.
*
* Returns a reference to this object so that method calls can be chained together.
*
* Constraints:
* Range: 1 - 10000
*
* @param limit The maximum number of records to return. Specify a value of up to
* 10,000. If you specify a value that is greater than 10,000,
* GetRecords throws InvalidArgumentException.
*
* @return A reference to this updated object so that method calls can be chained
* together.
*/
public GetRecordsRequest withLimit(Integer limit) {
this.limit = limit;
return this;
}
/**
* Returns a string representation of this object; useful for testing and
* debugging.
*
* @return A string representation of this object.
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("{");
if (getShardIterator() != null) sb.append("ShardIterator: " + getShardIterator() + ",");
if (getLimit() != null) sb.append("Limit: " + getLimit() );
sb.append("}");
return sb.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int hashCode = 1;
hashCode = prime * hashCode + ((getShardIterator() == null) ? 0 : getShardIterator().hashCode());
hashCode = prime * hashCode + ((getLimit() == null) ? 0 : getLimit().hashCode());
return hashCode;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (obj instanceof GetRecordsRequest == false) return false;
GetRecordsRequest other = (GetRecordsRequest)obj;
if (other.getShardIterator() == null ^ this.getShardIterator() == null) return false;
if (other.getShardIterator() != null && other.getShardIterator().equals(this.getShardIterator()) == false) return false;
if (other.getLimit() == null ^ this.getLimit() == null) return false;
if (other.getLimit() != null && other.getLimit().equals(this.getLimit()) == false) return false;
return true;
}
}