org.opendaylight.mdsal.binding.util

Class RetryingManagedNewTransactionRunner

java.lang.Object

org.opendaylight.mdsal.binding.util.RetryingManagedNewTransactionRunner

All Implemented Interfaces:

ManagedNewTransactionRunner, ManagedTransactionFactory

@Beta
public class RetryingManagedNewTransactionRunner
extends Object

Implementation of ManagedNewTransactionRunner with automatic transparent retries.

Details about the threading model used by this class

This class runs the first attempt to call the delegated ManagedNewTransactionRunner, which typically is a ManagedNewTransactionRunnerImpl which safely invokes WriteTransaction.commit(), in the using application's thread (like a MoreExecutors.directExecutor() would, if this were an Executor, which it's not).

Any retry attempts required, if that submit() (eventually) fails with an OptimisticLockFailedException, are run in the calling thread of that eventual future completion by a MoreExecutors.directExecutor() implicit in the constructor which does not require you to specify an explicit Executor argument. Normally that will be an internal thread from the respective DataBroker implementation, not your application's thread anymore, because that meanwhile could well be off doing something else! Normally, that is not a problem, because retries "should" be relatively uncommon, and (re)issuing some DataBroker put() or delete() and re-submit() should be fast.

If this default is not suitable (e.g. for particularly slow try/retry code), then you can specify another Executor to be used for the retries by using the alternative constructor.

Author:

Michael Vorburger.ch & Stephen Kitt

Constructor Summary

Constructors

Constructor and Description
RetryingManagedNewTransactionRunner(DataBroker dataBroker) Constructor.
RetryingManagedNewTransactionRunner(DataBroker dataBroker, Executor executor, int maxRetries) Constructor.
RetryingManagedNewTransactionRunner(DataBroker dataBroker, int maxRetries) Constructor.

Method Summary

Modifier and Type	Method and Description
<D extends Datastore,E extends Exception,R> R	applyInterruptiblyWithNewReadOnlyTransactionAndClose(Class<D> datastoreType, InterruptibleCheckedFunction<TypedReadTransaction<D>,R,E> txFunction) Invokes a function with a NEW TypedReadTransaction, and ensures that that transaction is closed.
<D extends Datastore,E extends Exception,R> R	applyWithNewReadOnlyTransactionAndClose(Class<D> datastoreType, CheckedFunction<TypedReadTransaction<D>,R,E> txFunction) Invokes a function with a NEW TypedReadTransaction, and ensures that that transaction is closed.
<D extends Datastore,E extends Exception,R> com.google.common.util.concurrent.FluentFuture<R>	applyWithNewReadWriteTransactionAndSubmit(Class<D> datastoreType, InterruptibleCheckedFunction<TypedReadWriteTransaction<D>,R,E> txFunction) Invokes a function with a NEW ReadWriteTransaction, and then submits that transaction and returns the Future from that submission, or cancels it if an exception was thrown and returns a failed future with that exception.
<R> R	applyWithNewTransactionChainAndClose(Function<ManagedTransactionChain,R> chainConsumer) Invokes a function with a new ManagedTransactionChain, which is a wrapper around standard transaction chains providing managed semantics.
<D extends Datastore,E extends Exception> void	callInterruptiblyWithNewReadOnlyTransactionAndClose(Class<D> datastoreType, InterruptibleCheckedConsumer<TypedReadTransaction<D>,E> txConsumer) Invokes a function with a NEW ReadTransaction, and ensures that that transaction is closed.
<D extends Datastore,E extends Exception> void	callWithNewReadOnlyTransactionAndClose(Class<D> datastoreType, CheckedConsumer<TypedReadTransaction<D>,E> txConsumer) Invokes a function with a NEW ReadTransaction, and ensures that that transaction is closed.
<D extends Datastore,E extends Exception> com.google.common.util.concurrent.FluentFuture<? extends Object>	callWithNewReadWriteTransactionAndSubmit(Class<D> datastoreType, InterruptibleCheckedConsumer<TypedReadWriteTransaction<D>,E> txConsumer) Invokes a consumer with a NEW ReadWriteTransaction, and then submits that transaction and returns the Future from that submission, or cancels it if an exception was thrown and returns a failed future with that exception.
<D extends Datastore,E extends Exception> com.google.common.util.concurrent.FluentFuture<? extends Object>	callWithNewWriteOnlyTransactionAndSubmit(Class<D> datastoreType, InterruptibleCheckedConsumer<TypedWriteTransaction<D>,E> txConsumer) Invokes a consumer with a NEW WriteTransaction, and then submits that transaction and returns the Future from that submission, or cancels it if an exception was thrown and returns a failed future with that exception.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RetryingManagedNewTransactionRunner

@Inject
public RetryingManagedNewTransactionRunner(DataBroker dataBroker)

Constructor. Please see the class level documentation above for more details about the threading model used. This uses the default of 3 retries, which is typically suitable.

Parameters:

dataBroker - the DataBroker from which transactions are obtained

Throws:

NullPointerException - if dataBroker is null.

RetryingManagedNewTransactionRunner

public RetryingManagedNewTransactionRunner(DataBroker dataBroker,
                                           int maxRetries)

Constructor. Please see the class level documentation above for more details about the threading model used.

Parameters:

dataBroker - the DataBroker from which transactions are obtained

maxRetries - the maximum number of retry attempts

RetryingManagedNewTransactionRunner

public RetryingManagedNewTransactionRunner(DataBroker dataBroker,
                                           Executor executor,
                                           int maxRetries)

Constructor. Please see the class level documentation above for more details about the threading model used.

Parameters:

dataBroker - the DataBroker from which transactions are obtained

executor - the Executor to asynchronously run any retry attempts in

maxRetries - the maximum number of retry attempts

Method Detail

applyInterruptiblyWithNewReadOnlyTransactionAndClose

public <D extends Datastore,E extends Exception,R> R applyInterruptiblyWithNewReadOnlyTransactionAndClose(Class<D> datastoreType,
                                                                                                          InterruptibleCheckedFunction<TypedReadTransaction<D>,R,E> txFunction)
                                                                                                   throws E extends Exception,
                                                                                                          InterruptedException

Description copied from interface: ManagedTransactionFactory

Invokes a function with a NEW TypedReadTransaction, and ensures that that transaction is closed. Thus when this method returns, that transaction is guaranteed to have been closed, and will never "leak" and waste memory.

The function must not itself attempt to close the transaction. (It can't directly, since TypedReadTransaction doesn't expose a close() method.)

The provided transaction is specific to the given logical datastore type and cannot be used for any other.

Specified by:

applyInterruptiblyWithNewReadOnlyTransactionAndClose in interface ManagedTransactionFactory

Parameters:

datastoreType - the Datastore type that will be accessed

txFunction - the InterruptibleCheckedFunction that needs a new read transaction

Returns:

the result of the function.

Throws:

E - if an error occurs.

InterruptedException - if the function is interrupted (this is passed through from the provided function).

E extends Exception

applyWithNewReadOnlyTransactionAndClose

public <D extends Datastore,E extends Exception,R> R applyWithNewReadOnlyTransactionAndClose(Class<D> datastoreType,
                                                                                             CheckedFunction<TypedReadTransaction<D>,R,E> txFunction)
                                                                                      throws E extends Exception

Description copied from interface: ManagedTransactionFactory

Invokes a function with a NEW TypedReadTransaction, and ensures that that transaction is closed. Thus when this method returns, that transaction is guaranteed to have been closed, and will never "leak" and waste memory.

The function must not itself attempt to close the transaction. (It can't directly, since TypedReadTransaction doesn't expose a close() method.)

The provided transaction is specific to the given logical datastore type and cannot be used for any other.

Specified by:

applyWithNewReadOnlyTransactionAndClose in interface ManagedTransactionFactory

Parameters:

datastoreType - the Datastore type that will be accessed

txFunction - the InterruptibleCheckedFunction that needs a new read transaction

Returns:

the result of the function.

Throws:

E - if an error occurs.

E extends Exception

applyWithNewReadWriteTransactionAndSubmit

public <D extends Datastore,E extends Exception,R> com.google.common.util.concurrent.FluentFuture<R> applyWithNewReadWriteTransactionAndSubmit(Class<D> datastoreType,
                                                                                                                                               InterruptibleCheckedFunction<TypedReadWriteTransaction<D>,R,E> txFunction)

Description copied from interface: ManagedTransactionFactory

Invokes a function with a NEW ReadWriteTransaction, and then submits that transaction and returns the Future from that submission, or cancels it if an exception was thrown and returns a failed future with that exception. Thus when this method returns, that transaction is guaranteed to have been either submitted or cancelled, and will never "leak" and waste memory.

The function must not itself use WriteTransaction.cancel(), or WriteTransaction.commit() (it will throw an UnsupportedOperationException).

The provided transaction is specific to the given logical datastore type and cannot be used for any other.

This is an asynchronous API, like DataBroker's own; when returning from this method, the operation of the Transaction may well still be ongoing in the background, or pending; calling code therefore must handle the returned future, e.g. by passing it onwards (return), or by itself adding callback listeners to it using Futures' methods, or by transforming it into a CompletionStage (but better NOT by using the blocking Future.get() on it).

Specified by:

applyWithNewReadWriteTransactionAndSubmit in interface ManagedTransactionFactory

Parameters:

datastoreType - the Datastore type that will be accessed

txFunction - the InterruptibleCheckedFunction that needs a new read-write transaction

Returns:

the FluentFuture returned by WriteTransaction.commit(), or a failed future with an application specific exception (not from submit())

applyWithNewTransactionChainAndClose

public <R> R applyWithNewTransactionChainAndClose(Function<ManagedTransactionChain,R> chainConsumer)

Description copied from interface: ManagedNewTransactionRunner

Invokes a function with a new ManagedTransactionChain, which is a wrapper around standard transaction chains providing managed semantics. The transaction chain will be closed when the function returns.

This is an asynchronous API, like DataBroker's own; when this method returns, the transactions in the chain may well still be ongoing in the background, or pending. It is up to the consumer and caller to agree on how failure will be handled; for example, the return type can include the futures corresponding to the transactions in the chain. The implementation uses a default transaction chain listener which logs an error if any of the transactions fail.

The MD-SAL transaction chain semantics are preserved: each transaction in the chain will see the results of the previous transactions in the chain, even if they haven't been fully committed yet; and any error will result in subsequent transactions in the chain not being submitted.

Specified by:

applyWithNewTransactionChainAndClose in interface ManagedNewTransactionRunner

Type Parameters:

R - The type of result returned by the function.

Parameters:

chainConsumer - The Function that will build transactions in the transaction chain.

Returns:

The result of the function call.

callInterruptiblyWithNewReadOnlyTransactionAndClose

public <D extends Datastore,E extends Exception> void callInterruptiblyWithNewReadOnlyTransactionAndClose(Class<D> datastoreType,
                                                                                                          InterruptibleCheckedConsumer<TypedReadTransaction<D>,E> txConsumer)
                                                                                                   throws E extends Exception,
                                                                                                          InterruptedException

Description copied from interface: ManagedTransactionFactory

Invokes a function with a NEW ReadTransaction, and ensures that that transaction is closed. Thus when this method returns, that transaction is guaranteed to have been closed, and will never "leak" and waste memory.

The function must not itself attempt to close the transaction. (It can't directly, since ReadTransaction doesn't expose a close() method.)

The provided transaction is specific to the given logical datastore type and cannot be used for any other.

Specified by:

callInterruptiblyWithNewReadOnlyTransactionAndClose in interface ManagedTransactionFactory

Parameters:

datastoreType - the Datastore type that will be accessed

txConsumer - the InterruptibleCheckedFunction that needs a new read transaction

Throws:

E - if an error occurs.

InterruptedException - if the function is interrupted (this is passed through from the provided function).

E extends Exception

callWithNewReadOnlyTransactionAndClose

public <D extends Datastore,E extends Exception> void callWithNewReadOnlyTransactionAndClose(Class<D> datastoreType,
                                                                                             CheckedConsumer<TypedReadTransaction<D>,E> txConsumer)
                                                                                      throws E extends Exception

Description copied from interface: ManagedTransactionFactory

Invokes a function with a NEW ReadTransaction, and ensures that that transaction is closed. Thus when this method returns, that transaction is guaranteed to have been closed, and will never "leak" and waste memory.

The function must not itself attempt to close the transaction. (It can't directly, since ReadTransaction doesn't expose a close() method.)

The provided transaction is specific to the given logical datastore type and cannot be used for any other.

Specified by:

callWithNewReadOnlyTransactionAndClose in interface ManagedTransactionFactory

Parameters:

datastoreType - the Datastore type that will be accessed

txConsumer - the InterruptibleCheckedFunction that needs a new read transaction

Throws:

E - if an error occurs.

E extends Exception

callWithNewReadWriteTransactionAndSubmit

public <D extends Datastore,E extends Exception> com.google.common.util.concurrent.FluentFuture<? extends Object> callWithNewReadWriteTransactionAndSubmit(Class<D> datastoreType,
                                                                                                                                                           InterruptibleCheckedConsumer<TypedReadWriteTransaction<D>,E> txConsumer)

Description copied from interface: ManagedTransactionFactory

Invokes a consumer with a NEW ReadWriteTransaction, and then submits that transaction and returns the Future from that submission, or cancels it if an exception was thrown and returns a failed future with that exception. Thus when this method returns, that transaction is guaranteed to have been either submitted or cancelled, and will never "leak" and waste memory.

The consumer should not (cannot) itself use WriteTransaction.cancel(), or WriteTransaction.commit() (it will throw an UnsupportedOperationException).

The provided transaction is specific to the given logical datastore type and cannot be used for any other.

This is an asynchronous API, like DataBroker's own; when returning from this method, the operation of the Transaction may well still be ongoing in the background, or pending; calling code therefore must handle the returned future, e.g. by passing it onwards (return), or by itself adding callback listeners to it using Futures' methods, or by transforming it into a CompletionStage (but better NOT by using the blocking Future.get() on it).

Specified by:

callWithNewReadWriteTransactionAndSubmit in interface ManagedTransactionFactory

Parameters:

datastoreType - the Datastore type that will be accessed

txConsumer - the InterruptibleCheckedConsumer that needs a new read-write transaction

Returns:

the FluentFuture returned by WriteTransaction.commit(), or a failed future with an application specific exception (not from submit())

callWithNewWriteOnlyTransactionAndSubmit

public <D extends Datastore,E extends Exception> com.google.common.util.concurrent.FluentFuture<? extends Object> callWithNewWriteOnlyTransactionAndSubmit(Class<D> datastoreType,
                                                                                                                                                           InterruptibleCheckedConsumer<TypedWriteTransaction<D>,E> txConsumer)

Description copied from interface: ManagedTransactionFactory

Invokes a consumer with a NEW WriteTransaction, and then submits that transaction and returns the Future from that submission, or cancels it if an exception was thrown and returns a failed future with that exception. Thus when this method returns, that transaction is guaranteed to have been either submitted or cancelled, and will never "leak" and waste memory.

The consumer should not (cannot) itself use WriteTransaction.cancel(), or WriteTransaction.commit() (it will throw an UnsupportedOperationException).

The provided transaction is specific to the given logical datastore type and cannot be used for any other.

This is an asynchronous API, like DataBroker's own; when returning from this method, the operation of the Transaction may well still be ongoing in the background, or pending; calling code therefore must handle the returned future, e.g. by passing it onwards (return), or by itself adding callback listeners to it using Futures' methods, or by transforming it into a CompletionStage (but better NOT by using the blocking Future.get() on it).

Specified by:

callWithNewWriteOnlyTransactionAndSubmit in interface ManagedTransactionFactory

Parameters:

datastoreType - the Datastore type that will be accessed

txConsumer - the InterruptibleCheckedConsumer that needs a new write only transaction

Returns:

the FluentFuture returned by WriteTransaction.commit(), or a failed future with an application specific exception (not from submit())