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TableBase.java
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TableBase.java
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/*
* Copyright 2013 Gordon Burgett and individual contributors
*
* Licensed 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.
*/
package org.xflatdb.xflat.db;
import org.xflatdb.xflat.EngineStateException;
/**
* The base class for implementations of {@link org.xflatdb.xflat.Table}.
* This provides dependencies to table implementations that are injected by the database.
* @author gordon
*/
public abstract class TableBase {
private String tableName;
/**
* Gets the table's name.
* @return The table name.
*/
protected String getTableName(){
return this.tableName;
}
private IdGenerator idGenerator;
/**
* Injects the ID generator used by this table to generate IDs for objects
* that do not already have them.
* @param idGenerator The ID generator to use.
*/
public void setIdGenerator(IdGenerator idGenerator) {
this.idGenerator = idGenerator;
}
/**
* Gets the ID generator used by this table to generate IDs for objects
* that do not already have them.
* @return The ID generator used by the table.
*/
protected IdGenerator getIdGenerator(){
return this.idGenerator;
}
private EngineProvider engineProvider;
/**
* Creates a new Table for the given table type and name.
* @param tableType The type of the objects in this table.
* @param tableName The name of the table.
*/
protected TableBase(String tableName){
this.tableName = tableName;
}
/**
* Sets the new engine for this Table. This wakes any threads that were
* waiting on the new engine.
* @param engine The new engine for the table.
*/
void setEngineProvider(EngineProvider engine){
if(engine == null){
throw new IllegalArgumentException("EngineProvider cannot be null - use clearEngine instead");
}
this.engineProvider = engine;
}
/**
* Performs an action with an engine obtained from the EngineProvider.
* Also wraps the action in some special engine error handling.
* <p/>
* Beware that the action may be executed multiple times depending on the retry
* logic of this method.
* @param <T> The return type of the action.
* @param action The action to perform.
* @return The value returned by the action.
*/
protected <T> T doWithEngine(EngineAction<T> action){
try{
return action.act(this.engineProvider.provideEngine());
}
catch(EngineStateException ex){
//The engine we got may have been just spun down by another thread,
//try again with a new engine and if it happens again let it throw
return action.act(this.engineProvider.provideEngine());
}
}
}