Java tutorial
/** * Licensed to the Rhiot under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The 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. */ package io.rhiot.cloudplatform.service.mailbox; import com.google.common.collect.ImmutableMap; import java.util.HashMap; import java.util.Map; public class InMemoryMailStore implements MailStore { private final Map<String, Map<String, Object>> mails = new HashMap<>(); @Override public void save(String receiver, Map<String, Object> mail) { mails.put(receiver, mail); } public Map<String, Map<String, Object>> mails() { return ImmutableMap.copyOf(mails); } }