| /////////////////////////////////////////////////////////////// |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| /////////////////////////////////////////////////////////////// |
| |
| [[extension-es-file,File EntityStore]] |
| = File EntityStore = |
| |
| [devstatus] |
| -------------- |
| source=extensions/entitystore-file/dev-status.xml |
| -------------- |
| |
| EntityStore service backed by a source control friendly file system format. |
| |
| Note that content should not be modified directly, and doing so may corrupt the data. |
| |
| include::../../build/docs/buildinfo/artifact.txt[] |
| |
| == Assembly == |
| |
| Assembly is done as follows: |
| |
| [snippet,java] |
| ---- |
| source=extensions/entitystore-file/src/test/java/org/qi4j/entitystore/file/FileEntityStoreTest.java |
| tag=assembly |
| ---- |
| |
| == Configuration == |
| |
| Here are the configuration properties for the File EntityStore: |
| |
| [snippet,java] |
| ---- |
| source=extensions/entitystore-file/src/main/java/org/qi4j/entitystore/file/FileEntityStoreConfiguration.java |
| tag=config |
| ---- |
| |
| +directory+ is optional and represent the directory where the File EntityStore will keep its persisted state. |
| |
| It defaults to System.getProperty( "user.dir" ) + "/qi4j/filestore" |
| If the given path is not absolute, then it's relative to the current working directory. |
| If you use the <<library-fileconfig>> then this property value is ignored and FileConfig is prefered. |
| |
| +slices+ defines how many slice directories the store should use. |
| |
| Many operating systems run into performance problems when the number of files in a directory grows. If |
| you expect a large number of entities in the file entity store, it is wise to set the number of slices |
| (default is 1) to an approximation of the square root of number of expected entities. |
| |
| For instance, if you estimate that you will have 1 million entities in the file entity store, you should |
| set the slices to 1000. |
| |
| There is a limit of minimum 1 slice and maximum 10,000 slices, and if more slices than that is needed, you |
| are probably pushing this entitystore beyond its capabilities. |
| |
| Note that the slices() can not be changed once it has been set, as it would cause the entity store not to |
| find the entities anymore. |