com.continuuity.loom.provisioner.mock.MockProvisionerTenantStore.java Source code

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Here is the source code for com.continuuity.loom.provisioner.mock.MockProvisionerTenantStore.java

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/*
 * Copyright 2012-2014, Continuuity, Inc.
 *
 * 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 com.continuuity.loom.provisioner.mock;

import com.google.common.collect.Maps;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

/**
 * Mock in memory store for keeping track of how many workers each tenant should have as well as how many workers each
 * tenant has live.
 */
public class MockProvisionerTenantStore {
    private static final MockProvisionerTenantStore INSTANCE = new MockProvisionerTenantStore();
    private final Map<String, Integer> liveWorkers;
    private final Map<String, Integer> assignedWorkers;

    private MockProvisionerTenantStore() {
        this.liveWorkers = Maps.newConcurrentMap();
        this.assignedWorkers = Maps.newConcurrentMap();
    }

    /**
     * Get the instance of the store.
     *
     * @return Instance of the store
     */
    public static MockProvisionerTenantStore getInstance() {
        return INSTANCE;
    }

    /**
     * Get the number of workers assigned to the given tenant.
     *
     * @param tenantId Id of the tenant to get the number of workers for
     * @return Number of workers assigned to the given tenant
     */
    public int getAssignedWorkers(String tenantId) {
        return assignedWorkers.containsKey(tenantId) ? assignedWorkers.get(tenantId) : 0;
    }

    /**
     * Get the number of live workers running for the given tenant.
     *
     * @param tenantId Id of the tenant to get the number of live workers for
     * @return Number of live workers running for the given tenant
     */
    public int getLiveWorkers(String tenantId) {
        return liveWorkers.containsKey(tenantId) ? liveWorkers.get(tenantId) : 0;
    }

    /**
     * Get all tenants that have been assigned workers.
     *
     * @return All tenants that have been assigned workers
     */
    public Set<String> getAssignedTenants() {
        return assignedWorkers.keySet();
    }

    /**
     * Get all tenants that have live running workers.
     *
     * @return All tenants that have live running workers
     */
    public Set<String> getLiveTenants() {
        return liveWorkers.keySet();
    }

    /**
     * Set the number of assigned workers for a given tenant.
     *
     * @param tenantId Id of the tenant to assign workers to
     * @param numWorkers Number of workers the tenant should have
     */
    public void setAssignedWorkers(String tenantId, int numWorkers) {
        if (numWorkers == 0) {
            assignedWorkers.remove(tenantId);
        } else {
            assignedWorkers.put(tenantId, numWorkers);
        }
    }

    /**
     * Delete a tenant from the store.
     *
     * @param tenantId Id of the tenant to delete
     */
    public void deleteTenant(String tenantId) {
        assignedWorkers.remove(tenantId);
        liveWorkers.remove(tenantId);
    }

    /**
     * Set the number of live workers running for a given tenant.
     *
     * @param tenantId Id of the tenant to set the number of live workers for
     * @param numWorkers Number of live workers running for the tenant
     */
    public void setLiveTenantWorkers(String tenantId, int numWorkers) {
        if (numWorkers == 0) {
            liveWorkers.remove(tenantId);
        } else {
            liveWorkers.put(tenantId, numWorkers);
        }
    }

    /**
     * Get a mapping of tenant to number of live running workers.
     *
     * @return Mapping of tenant to number of live running workers
     */
    public Map<String, Integer> getUsage() {
        return Collections.unmodifiableMap(liveWorkers);
    }
}