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java.lang.Objectcom.sleepycat.collections.TransactionRunner
Starts a transaction, calls TransactionWorker.doWork(), and handles
 transaction retry and exceptions.
| Field Summary | |
| static int | DEFAULT_MAX_RETRIESThe default maximum number of retries. | 
| Constructor Summary | |
| TransactionRunner(Environment env)Creates a transaction runner for a given Berkeley DB environment. | |
| TransactionRunner(Environment env,
                  int maxRetries,
                  TransactionConfig config)Creates a transaction runner for a given Berkeley DB environment and with a given number of maximum retries. | |
| Method Summary | |
|  boolean | getAllowNestedTransactions()Returns whether nested transactions will be created if run()is called when a transaction is already active for
 the current thread. | 
|  int | getMaxRetries()Returns the maximum number of retries that will be performed when deadlocks are detected. | 
|  TransactionConfig | getTransactionConfig()Returns the transaction configuration used for calling Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig). | 
|  void | run(TransactionWorker worker)Calls the TransactionWorker.doWork()method and, for transactional
 environments, begins and ends a transaction. | 
|  void | setAllowNestedTransactions(boolean allowNestedTxn)Changes whether nested transactions will be created if run()is called when a transaction is already active for
 the current thread. | 
|  void | setMaxRetries(int maxRetries)Changes the maximum number of retries that will be performed when deadlocks are detected. | 
|  void | setTransactionConfig(TransactionConfig config)Changes the transaction configuration used for calling Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig). | 
| Methods inherited from class java.lang.Object | 
| equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait | 
| Field Detail | 
public static final int DEFAULT_MAX_RETRIES
| Constructor Detail | 
public TransactionRunner(Environment env)
DEFAULT_MAX_RETRIES) and
 a null (default) TransactionConfig will be used.
env - is the environment for running transactions.
public TransactionRunner(Environment env,
                         int maxRetries,
                         TransactionConfig config)
env - is the environment for running transactions.maxRetries - is the maximum number of retries that will be
 performed when deadlocks are detected.config - the transaction configuration used for calling
 Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig), or null to use the default
 configuration.  The configuration object is not cloned, and
 any modifications to it will impact subsequent transactions.| Method Detail | 
public int getMaxRetries()
public void setMaxRetries(int maxRetries)
public boolean getAllowNestedTransactions()
run() is called when a transaction is already active for
 the current thread.
 By default this property is false.
public void setAllowNestedTransactions(boolean allowNestedTxn)
run() is called when a transaction is already active for
 the current thread.
 Calling this method does not impact transactions already running.
public TransactionConfig getTransactionConfig()
Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig).
 If this property is null, the default configuration is used. The configuration object is not cloned, and any modifications to it will impact subsequent transactions.
public void setTransactionConfig(TransactionConfig config)
Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig).
 If this property is null, the default configuration is used. The configuration object is not cloned, and any modifications to it will impact subsequent transactions.
config - the transaction configuration.
public void run(TransactionWorker worker)
         throws DatabaseException,
                Exception
TransactionWorker.doWork() method and, for transactional
 environments, begins and ends a transaction.  If the environment given
 is non-transactional, a transaction will not be used but the doWork()
 method will still be called.
 In a transactional environment, a new transaction is started before calling doWork(). This will start a nested transaction if one is already active. If DeadlockException is thrown by doWork(), the transaction will be aborted and the process will be repeated up to the maximum number of retries specified. If another exception is thrown by doWork() or the maximum number of retries has occurred, the transaction will be aborted and the exception will be rethrown by this method. If no exception is thrown by doWork(), the transaction will be committed. This method will not attempt to commit or abort a transaction if it has already been committed or aborted by doWork().
DeadlockException - when it is thrown by doWork() and the
 maximum number of retries has occurred.  The transaction will have been
 aborted by this method.
Exception - when any other exception is thrown by doWork().  The
 exception will first be unwrapped by calling ExceptionUnwrapper.unwrap(java.lang.Exception).  The transaction will have been aborted by
 this method.
DatabaseException| 
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