com.amazonaws.services.kinesis.leases.interfaces.ILeaseManager Maven / Gradle / Ivy
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The Amazon Kinesis Client Library for Java enables Java developers to easily consume and process data
from Amazon Kinesis.
/*
* Copyright 2019 Amazon.com, Inc. or its affiliates.
* 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 com.amazonaws.services.kinesis.leases.interfaces;
import java.util.List;
import com.amazonaws.services.kinesis.leases.exceptions.DependencyException;
import com.amazonaws.services.kinesis.leases.exceptions.InvalidStateException;
import com.amazonaws.services.kinesis.leases.exceptions.ProvisionedThroughputException;
import com.amazonaws.services.kinesis.leases.impl.Lease;
/**
* Supports basic CRUD operations for Leases.
*
* @param Lease subclass, possibly Lease itself.
*/
public interface ILeaseManager {
/**
* Creates the table that will store leases. Succeeds if table already exists.
*
* @param readCapacity
* @param writeCapacity
*
* @return true if we created a new table (table didn't exist before)
*
* @throws ProvisionedThroughputException if we cannot create the lease table due to per-AWS-account capacity
* restrictions.
* @throws DependencyException if DynamoDB createTable fails in an unexpected way
*/
public boolean createLeaseTableIfNotExists(Long readCapacity, Long writeCapacity)
throws ProvisionedThroughputException, DependencyException;
/**
* @return true if the lease table already exists.
*
* @throws DependencyException if DynamoDB describeTable fails in an unexpected way
*/
public boolean leaseTableExists() throws DependencyException;
/**
* Blocks until the lease table exists by polling leaseTableExists.
*
* @param secondsBetweenPolls time to wait between polls in seconds
* @param timeoutSeconds total time to wait in seconds
*
* @return true if table exists, false if timeout was reached
*
* @throws DependencyException if DynamoDB describeTable fails in an unexpected way
*/
public boolean waitUntilLeaseTableExists(long secondsBetweenPolls, long timeoutSeconds) throws DependencyException;
/**
* List all objects in table synchronously.
*
* @throws DependencyException if DynamoDB scan fails in an unexpected way
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB scan fails due to lack of capacity
*
* @return list of leases
*/
public List listLeases() throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Create a new lease. Conditional on a lease not already existing with this shardId.
*
* @param lease the lease to create
*
* @return true if lease was created, false if lease already exists
*
* @throws DependencyException if DynamoDB put fails in an unexpected way
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB put fails due to lack of capacity
*/
public boolean createLeaseIfNotExists(T lease)
throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* @param shardId Get the lease for this shardId
*
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB get fails due to lack of capacity
* @throws DependencyException if DynamoDB get fails in an unexpected way
*
* @return lease for the specified shardId, or null if one doesn't exist
*/
public T getLease(String shardId) throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Renew a lease by incrementing the lease counter. Conditional on the leaseCounter in DynamoDB matching the leaseCounter
* of the input. Mutates the leaseCounter of the passed-in lease object after updating the record in DynamoDB.
*
* @param lease the lease to renew
*
* @return true if renewal succeeded, false otherwise
*
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB update fails due to lack of capacity
* @throws DependencyException if DynamoDB update fails in an unexpected way
*/
public boolean renewLease(T lease)
throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Take a lease for the given owner by incrementing its leaseCounter and setting its owner field. Conditional on
* the leaseCounter in DynamoDB matching the leaseCounter of the input. Mutates the leaseCounter and owner of the
* passed-in lease object after updating DynamoDB.
*
* @param lease the lease to take
* @param owner the new owner
*
* @return true if lease was successfully taken, false otherwise
*
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB update fails due to lack of capacity
* @throws DependencyException if DynamoDB update fails in an unexpected way
*/
public boolean takeLease(T lease, String owner)
throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Evict the current owner of lease by setting owner to null. Conditional on the owner in DynamoDB matching the owner of
* the input. Mutates the lease counter and owner of the passed-in lease object after updating the record in DynamoDB.
*
* @param lease the lease to void
*
* @return true if eviction succeeded, false otherwise
*
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB update fails due to lack of capacity
* @throws DependencyException if DynamoDB update fails in an unexpected way
*/
public boolean evictLease(T lease)
throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Delete the given lease from DynamoDB. Does nothing when passed a lease that does not exist in DynamoDB.
*
* @param lease the lease to delete
*
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB delete fails due to lack of capacity
* @throws DependencyException if DynamoDB delete fails in an unexpected way
*/
public void deleteLease(T lease) throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Delete all leases from DynamoDB. Useful for tools/utils and testing.
*
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB scan or delete fail due to lack of capacity
* @throws DependencyException if DynamoDB scan or delete fail in an unexpected way
*/
public void deleteAll() throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Update application-specific fields of the given lease in DynamoDB. Does not update fields managed by the leasing
* library such as leaseCounter, leaseOwner, or leaseKey. Conditional on the leaseCounter in DynamoDB matching the
* leaseCounter of the input. Increments the lease counter in DynamoDB so that updates can be contingent on other
* updates. Mutates the lease counter of the passed-in lease object.
*
* @return true if update succeeded, false otherwise
*
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB update fails due to lack of capacity
* @throws DependencyException if DynamoDB update fails in an unexpected way
*/
public boolean updateLease(T lease)
throws DependencyException, InvalidStateException, ProvisionedThroughputException;
/**
* Check (synchronously) if there are any leases in the lease table.
*
* @return true if there are no leases in the lease table
*
* @throws DependencyException if DynamoDB scan fails in an unexpected way
* @throws InvalidStateException if lease table does not exist
* @throws ProvisionedThroughputException if DynamoDB scan fails due to lack of capacity
*/
public boolean isLeaseTableEmpty() throws DependencyException, InvalidStateException, ProvisionedThroughputException;
}