Package com.apple.foundationdb

Interface Database

  • All Superinterfaces:
    java.lang.AutoCloseable, ReadTransactionContext, TransactionContext
    public interface Database
extends java.lang.AutoCloseable, TransactionContext
    A mutable, lexicographically ordered mapping from binary keys to binary values. Transactions are used to manipulate data within a single Database -- multiple, concurrent Transactions on a Database enforce ACID properties.

    The simplest correct programs using FoundationDB will make use of the methods defined in the TransactionContext interface. When used on a Database these methods will call Transaction#commit() after user code has been executed. These methods will not return successfully until commit() has returned successfully.

    Note: Database objects must be closed when no longer in use in order to free any associated resources.

    • Method Summary

      All Methods Instance Methods Abstract Methods Default Methods 
      Modifier and Type Method Description
      void close()
      Close the Database object and release any associated resources.
      default Transaction createTransaction()
      Creates a Transaction that operates on this Database.

      Note: Java transactions automatically set the TransactionOptions.setUsedDuringCommitProtectionDisable() option.
      Transaction createTransaction​(java.util.concurrent.Executor e)
      Creates a Transaction that operates on this Database with the given Executor for asynchronous callbacks.
      Transaction createTransaction​(java.util.concurrent.Executor e, EventKeeper eventKeeper)
      Creates a Transaction that operates on this Database with the given Executor for asynchronous callbacks.
      double getMainThreadBusyness()
      Returns a value which indicates the saturation of the client
      Note: By default, this value is updated every second
      DatabaseOptions options()
      Returns a set of options that can be set on a Database
      default <T> T read​(java.util.function.Function<? super ReadTransaction,​T> retryable)
      Runs a read-only transactional function against this Database with retry logic.
      <T> T read​(java.util.function.Function<? super ReadTransaction,​T> retryable, java.util.concurrent.Executor e)
      Runs a read-only transactional function against this Database with retry logic.
      default <T> java.util.concurrent.CompletableFuture<T> readAsync​(java.util.function.Function<? super ReadTransaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable)
      Runs a read-only transactional function against this Database with retry logic.
      <T> java.util.concurrent.CompletableFuture<T> readAsync​(java.util.function.Function<? super ReadTransaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable, java.util.concurrent.Executor e)
      Runs a read-only transactional function against this Database with retry logic.
      default <T> T run​(java.util.function.Function<? super Transaction,​T> retryable)
      Runs a transactional function against this Database with retry logic.
      <T> T run​(java.util.function.Function<? super Transaction,​T> retryable, java.util.concurrent.Executor e)
      Runs a transactional function against this Database with retry logic.
      default <T> java.util.concurrent.CompletableFuture<T> runAsync​(java.util.function.Function<? super Transaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable)
      Runs a transactional function against this Database with retry logic.
      <T> java.util.concurrent.CompletableFuture<T> runAsync​(java.util.function.Function<? super Transaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable, java.util.concurrent.Executor e)
      Runs a transactional function against this Database with retry logic.

    • Method Detail

      • createTransaction

        Transaction createTransaction​(java.util.concurrent.Executor e)
        Creates a Transaction that operates on this Database with the given Executor for asynchronous callbacks.
        Parameters:
        e - the Executor to use when executing asynchronous callbacks for the database
        Returns:
        a newly created Transaction that reads from and writes to this Database.

      • createTransaction

        Transaction createTransaction​(java.util.concurrent.Executor e,
                              EventKeeper eventKeeper)
        Creates a Transaction that operates on this Database with the given Executor for asynchronous callbacks.
        Parameters:
        e - the Executor to use when executing asynchronous callbacks for the database
        eventKeeper - the EventKeeper to use when tracking instrumented calls for the transaction.
        Returns:
        a newly created Transaction that reads from and writes to this Database.

      • options

        DatabaseOptions options()
        Returns a set of options that can be set on a Database
        Returns:
        a set of database-specific options affecting this Database

      • getMainThreadBusyness

        double getMainThreadBusyness()
        Returns a value which indicates the saturation of the client
        Note: By default, this value is updated every second
        Returns:
        a value where 0 indicates that the client is idle and 1 (or larger) indicates that the client is saturated.

      • read

        default <T> T read​(java.util.function.Function<? super ReadTransaction,​T> retryable)
        Runs a read-only transactional function against this Database with retry logic. apply(ReadTransaction) will be called on the supplied Function until a non-retryable FDBException (or any Throwable other than an FDBException) is thrown. This call is blocking -- this method will not return until the Function has been called and completed without error.
        Specified by:
        read in interface ReadTransactionContext
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a Transaction against this database
        Returns:
        the result of the last run of retryable

      • read

        <T> T read​(java.util.function.Function<? super ReadTransaction,​T> retryable,
           java.util.concurrent.Executor e)
        Runs a read-only transactional function against this Database with retry logic. Use this formulation of read(Function) if one wants to set a custom Executor for the transaction when run.
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a Transaction against this database
        e - the Executor to use for asynchronous callbacks
        Returns:
        the result of the last run of retryable
        See Also:
        read(Function)

      • readAsync

        default <T> java.util.concurrent.CompletableFuture<T> readAsync​(java.util.function.Function<? super ReadTransaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable)
        Runs a read-only transactional function against this Database with retry logic. apply(ReadTransaction) will be called on the supplied Function until a non-retryable FDBException (or any Throwable other than an FDBException) is thrown. This call is non-blocking -- this method will return immediately and with a CompletableFuture that will be set when the Function has been called and completed without error.

        Any errors encountered executing retryable, or received from the database, will be set on the returned CompletableFuture.
        Specified by:
        readAsync in interface ReadTransactionContext
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a ReadTransaction against this database
        Returns:
        a CompletableFuture that will be set to the value returned by the last call to retryable

      • readAsync

        <T> java.util.concurrent.CompletableFuture<T> readAsync​(java.util.function.Function<? super ReadTransaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable,
                                                        java.util.concurrent.Executor e)
        Runs a read-only transactional function against this Database with retry logic. Use this version of readAsync(Function) if one wants to set a custom Executor for the transaction when run.
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a ReadTransaction against this database
        e - the Executor to use for asynchronous callbacks
        Returns:
        a CompletableFuture that will be set to the value returned by the last call to retryable
        See Also:
        readAsync(Function)

      • run

        default <T> T run​(java.util.function.Function<? super Transaction,​T> retryable)
        Runs a transactional function against this Database with retry logic. apply(Transaction) will be called on the supplied Function until a non-retryable FDBException (or any Throwable other than an FDBException) is thrown or commit(), when called after apply(), returns success. This call is blocking -- this method will not return until commit() has been called and returned success.

        As with other client/server databases, in some failure scenarios a client may be unable to determine whether a transaction succeeded. In these cases, your transaction may be executed twice. For more information about how to reason about these situations see the FounationDB Developer Guide
        Specified by:
        run in interface TransactionContext
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a Transaction against this database
        Returns:
        the result of the last run of retryable

      • run

        <T> T run​(java.util.function.Function<? super Transaction,​T> retryable,
          java.util.concurrent.Executor e)
        Runs a transactional function against this Database with retry logic. Use this formulation of run(Function) if one would like to set a custom Executor for the transaction when run.
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a Transaction against this database
        e - the Executor to use for asynchronous callbacks
        Returns:
        the result of the last run of retryable

      • runAsync

        default <T> java.util.concurrent.CompletableFuture<T> runAsync​(java.util.function.Function<? super Transaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable)
        Runs a transactional function against this Database with retry logic. apply(Transaction) will be called on the supplied Function until a non-retryable FDBException (or any Throwable other than an FDBException) is thrown or commit(), when called after apply(), returns success. This call is non-blocking -- this method will return immediately and with a CompletableFuture that will be set when commit() has been called and returned success.

        As with other client/server databases, in some failure scenarios a client may be unable to determine whether a transaction succeeded. In these cases, your transaction may be executed twice. For more information about how to reason about these situations see the FounationDB Developer Guide

        Any errors encountered executing retryable, or received from the database, will be set on the returned CompletableFuture.
        Specified by:
        runAsync in interface TransactionContext
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a Transaction against this database
        Returns:
        a CompletableFuture that will be set to the value returned by the last call to retryable

      • runAsync

        <T> java.util.concurrent.CompletableFuture<T> runAsync​(java.util.function.Function<? super Transaction,​? extends java.util.concurrent.CompletableFuture<T>> retryable,
                                                       java.util.concurrent.Executor e)
        Runs a transactional function against this Database with retry logic. Use this formulation of the non-blocking runAsync(Function) if one wants to set a custom Executor for the transaction when run.
        Type Parameters:
        T - the return type of retryable
        Parameters:
        retryable - the block of logic to execute in a Transaction against this database
        e - the Executor to use for asynchronous callbacks
        Returns:
        a CompletableFuture that will be set to the value returned by the last call to retryable
        See Also:
        run(Function)

      • close

        void close()
        Close the Database object and release any associated resources. This must be called at least once after the Database object is no longer in use. This can be called multiple times, but care should be taken that it is not in use in another thread at the time of the call.
        Specified by:
        close in interface java.lang.AutoCloseable