001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.impl;
018
019import java.util.concurrent.ConcurrentHashMap;
020import java.util.concurrent.ConcurrentMap;
021
022import org.apache.camel.api.management.ManagedOperation;
023import org.apache.camel.api.management.ManagedResource;
024import org.apache.camel.spi.StateRepository;
025import org.apache.camel.support.ServiceSupport;
026
027/**
028 * This {@link MemoryStateRepository} class is a memory-based implementation of a {@link StateRepository}.
029 */
030@ManagedResource(description = "Memory based state repository")
031public class MemoryStateRepository extends ServiceSupport implements StateRepository<String, String> {
032
033    private final ConcurrentMap<String, String> cache = new ConcurrentHashMap<>();
034
035    @Override
036    @ManagedOperation(description = "Adds the value of the given key to the store")
037    public void setState(String key, String value) {
038        cache.put(key, value);
039    }
040
041    @Override
042    @ManagedOperation(description = "Gets the value of the given key from store")
043    public String getState(String key) {
044        return cache.get(key);
045    }
046
047    @Override
048    protected void doStart() throws Exception {
049        // noop
050    }
051
052    @Override
053    protected void doStop() throws Exception {
054        cache.clear();
055    }
056}