MemoryStorageSource.java

/*
 * Copyright (c) 2011,2013 Big Switch Networks, Inc.
 *
 * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/legal/epl-v10.html
 *
 * 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.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *    Originally created by David Erickson, Stanford University 
 *
 *    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.sdnplatform.storage.memory;


import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.sdnplatform.core.module.ModuleContext;
import org.sdnplatform.core.module.IPlatformService;
import org.sdnplatform.perfmon.IPktInProcessingTimeService;
import org.sdnplatform.storage.IStorageSourceService;
import org.sdnplatform.storage.StorageException;
import org.sdnplatform.storage.SynchronousExecutorService;
import org.sdnplatform.storage.nosql.NoSqlStorageSource;


public class MemoryStorageSource extends NoSqlStorageSource {
    
    private Map<String, MemoryTable> tableMap = new HashMap<String,MemoryTable>();
    IPktInProcessingTimeService pktinProcessingTime;
    
    synchronized private MemoryTable getTable(String tableName, boolean create) {
        MemoryTable table = tableMap.get(tableName);
        if (table == null) {
            if (!create)
                throw new StorageException("Table " + tableName + " does not exist");
            table = new MemoryTable(tableName);
            tableMap.put(tableName, table);
        }
        return table;
    }
    
    @Override
    protected Collection<Map<String,Object>> getAllRows(String tableName, String[] columnNameList) {
        MemoryTable table = getTable(tableName, false);
        return table.getAllRows();
    }
    
    @Override
    protected Map<String,Object> getRow(String tableName, String[] columnNameList, Object rowKey) {
        MemoryTable table = getTable(tableName, false);
        return table.getRow(rowKey);
    }
    
    @Override
    protected List<Map<String,Object>> executeEqualityQuery(String tableName,
            String[] columnNameList, String predicateColumnName, Comparable<?> value) {
        MemoryTable table = getTable(tableName, false);
        List<Map<String,Object>> result = new ArrayList<Map<String,Object>>();
        synchronized (table) {
            Collection<Map<String,Object>> allRows = table.getAllRows();
            for (Map<String,Object> row : allRows) {
                Object v = row.get(predicateColumnName);
                if (value != null) {
                    if ((v != null) && value.equals(v))
                        result.add(row);
                } else if (v == null) {
                    result.add(row);
                }
            }
        }
        return result;
    }
    
    @SuppressWarnings({ "unchecked", "rawtypes" })
    @Override
    protected List<Map<String,Object>> executeRangeQuery(String tableName,
            String[] columnNameList, String predicateColumnName,
            Comparable<?> startValue, boolean startInclusive, Comparable<?> endValue, boolean endInclusive) {
        MemoryTable table = getTable(tableName, false);
        List<Map<String,Object>> result = new ArrayList<Map<String,Object>>();
        synchronized (table) {
            Collection<Map<String,Object>> allRows = table.getAllRows();
            for (Map<String,Object> row : allRows) {
                Comparable value = (Comparable) row.get(predicateColumnName);
                if (value != null) {
                    int compareResult = value.compareTo(startValue);
                    if ((compareResult > 0) || (startInclusive && (compareResult >= 0))) {
                        compareResult = value.compareTo(endValue);
                        if ((compareResult < 0) || (startInclusive && (compareResult <= 0))) {
                            result.add(row);
                        }
                    }
                }
            }
        }
        return result;
    }
    
    @Override
    protected void insertRows(String tableName, List<Map<String,Object>> insertRowList) {
        MemoryTable table = getTable(tableName, false);
        String primaryKeyName = getTablePrimaryKeyName(tableName);
        synchronized (table) {
            for (Map<String,Object> row : insertRowList) {
                Object primaryKey = row.get(primaryKeyName);
                if (primaryKey == null) {
                    if (primaryKeyName.equals(DEFAULT_PRIMARY_KEY_NAME)) {
                        row = new HashMap<String,Object>(row);
                        primaryKey = table.getNextId();
                        row.put(primaryKeyName, primaryKey);
                    }
                }
                table.insertRow(primaryKey, row);
            }
        }
    }
    
    @Override
    protected void updateRows(String tableName, Set<Object> rowKeys, Map<String,Object> updateRowList) {
        MemoryTable table = getTable(tableName, false);
        synchronized (table) {
            for (Object rowKey : rowKeys) {
                Map<String,Object> row = table.getRow(rowKey);
                if (row == null)
                    row = table.newRow(rowKey);
                for (Map.Entry<String,Object> entry: updateRowList.entrySet()) {
                    row.put(entry.getKey(), entry.getValue());
                }
            }
        }
    }
    
    @Override
    protected void updateRowsImpl(String tableName, List<Map<String,Object>> updateRowList) {
        MemoryTable table = getTable(tableName, false);
        String primaryKeyName = getTablePrimaryKeyName(tableName);
        synchronized (table) {
            for (Map<String,Object> updateRow : updateRowList) {
                Object rowKey = updateRow.get(primaryKeyName);
                if (rowKey == null)
                    throw new StorageException("Primary key not found.");
                Map<String,Object> row = table.getRow(rowKey);
                if (row == null)
                    row = table.newRow(rowKey);
                for (Map.Entry<String,Object> entry: updateRow.entrySet()) {
                    row.put(entry.getKey(), entry.getValue());
                }
            }
        }
    }
    
    @Override
    protected void deleteRowsImpl(String tableName, Set<Object> rowKeys) {
        MemoryTable table = getTable(tableName, false);
        synchronized (table) {
            for (Object rowKey : rowKeys) {
                table.deleteRow(rowKey);
            }
        }
    }
    
    @Override
    public void createTable(String tableName, Set<String> indexedColumnNames) {
        super.createTable(tableName, indexedColumnNames);
        getTable(tableName, true);
    }
    
    public void setPktinProcessingTime(
            IPktInProcessingTimeService pktinProcessingTime) {
        this.pktinProcessingTime = pktinProcessingTime;
    }

    // IModule methods

    @Override
    public void startUp(ModuleContext context) {
        super.startUp(context);
        executorService = new SynchronousExecutorService();
    }

    @Override
    public Map<Class<? extends IPlatformService>,
               IPlatformService> getServiceImpls() {
        Map<Class<? extends IPlatformService>,
            IPlatformService> m =
                new HashMap<Class<? extends IPlatformService>,
                            IPlatformService>();
        m.put(IStorageSourceService.class, this);
        return m;
    }
}