/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2014-2015 ForgeRock AS
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*/
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package org.opends.server.backends.pluggable.spi;
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import java.io.Closeable;
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import org.opends.server.admin.std.server.PluggableBackendCfg;
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/**
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* This interface abstracts the underlying storage engine,
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* isolating the pluggable backend generic code from a particular storage engine implementation.
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*/
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public interface Storage extends Closeable
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{
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/**
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* Initializes the storage engine before opening it.
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*
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* @param cfg
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* the configuration object
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* @throws Exception
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* if a problem occurs with the underlying storage engine
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* @see #open() to open the storage engine
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*/
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void initialize(PluggableBackendCfg cfg) throws Exception;
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/**
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* Starts the import operation.
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*
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* @return a new Importer object which must be closed to release all resources
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* @throws Exception
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* if a problem occurs with the underlying storage engine
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* @see #close() to release all resources once import is finished
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*/
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Importer startImport() throws Exception;
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/**
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* Opens the storage engine to allow executing operations on it.
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*
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* @throws Exception
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* if a problem occurs with the underlying storage engine
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* @see #close() to release all resources once import is finished
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*/
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void open() throws Exception;
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/**
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* Executes a read operation. In case of a read operation rollback, implementations must ensure
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* the read operation is retried until it succeeds.
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*
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* @param <T>
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* type of the value returned
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* @param readOperation
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* the read operation to execute
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* @return the value read by the read operation
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* @throws Exception
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* if a problem occurs with the underlying storage engine
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*/
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<T> T read(ReadOperation<T> readOperation) throws Exception;
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/**
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* Executes a write operation. In case of a write operation rollback, implementations must ensure
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* the write operation is retried until it succeeds.
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*
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* @param writeOperation
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* the write operation to execute
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* @throws Exception
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* if a problem occurs with the underlying storage engine
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*/
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void write(WriteOperation writeOperation) throws Exception;
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/**
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* Closes the tree identified by the provided name.
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*
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* @param treeName
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* the tree name
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*/
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void closeTree(TreeName treeName);
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/**
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* Returns whether the storage engine is in a valid state, i.e. whether it can be used for processing.
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*
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* @return {@code true} if the storage engine is in a valid state, {@code false} otherwise
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*/
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boolean isValid();
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/** {@inheritDoc} */
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@Override
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void close();
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}
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