org.ldp4j.application.kernel.impl.InMemoryConstraintReportRepository.java Source code

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Here is the source code for org.ldp4j.application.kernel.impl.InMemoryConstraintReportRepository.java

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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the LDP4j Project:
 *     http://www.ldp4j.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2014-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.ldp4j.framework:ldp4j-application-kernel-mem:0.2.1
 *   Bundle      : ldp4j-application-kernel-mem-0.2.1.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.ldp4j.application.kernel.impl;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Map;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.ldp4j.application.kernel.constraints.ConstraintReport;
import org.ldp4j.application.kernel.constraints.ConstraintReportId;
import org.ldp4j.application.kernel.constraints.ConstraintReportRepository;
import org.ldp4j.application.kernel.lifecycle.LifecycleException;
import org.ldp4j.application.kernel.lifecycle.Managed;
import org.ldp4j.application.kernel.resource.Resource;
import org.ldp4j.application.kernel.resource.ResourceId;

import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;

final class InMemoryConstraintReportRepository implements Managed, ConstraintReportRepository {

    private final ReadWriteLock lock = new ReentrantReadWriteLock();
    private final Multimap<ResourceId, String> failureIds;
    private final Map<ConstraintReportId, ConstraintReport> reports;

    InMemoryConstraintReportRepository() {
        this.reports = Maps.newLinkedHashMap();
        this.failureIds = LinkedHashMultimap.create();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ConstraintReport constraintReportOfId(ConstraintReportId id) {
        checkNotNull(id, "Constraint report identifier cannot be null");
        this.lock.readLock().lock();
        try {
            return this.reports.get(id);
        } finally {
            this.lock.readLock().unlock();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void add(ConstraintReport report) {
        checkNotNull(report, "Constraint report cannot be null");
        this.lock.writeLock().lock();
        try {
            ConstraintReportId id = report.id();
            this.failureIds.put(id.resourceId(), id.failureId());
            this.reports.put(id, report);
        } finally {
            this.lock.writeLock().unlock();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void remove(ConstraintReport report) {
        checkNotNull(report, "Constraint report cannot be null");
        this.lock.writeLock().lock();
        try {
            ConstraintReportId reportId = report.id();
            this.failureIds.remove(reportId.resourceId(), reportId.failureId());
            this.reports.remove(reportId);
        } finally {
            this.lock.writeLock().unlock();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void removeByResource(Resource resource) {
        checkNotNull(resource, "Resource cannot be null");
        this.lock.writeLock().lock();
        try {
            ResourceId resourceId = resource.id();
            for (String constraintsId : this.failureIds.get(resourceId)) {
                this.reports.remove(ConstraintReportId.create(resourceId, constraintsId));
            }
            this.failureIds.removeAll(resourceId);
        } finally {
            this.lock.writeLock().unlock();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void init() throws LifecycleException {
        // Nothing to do
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void shutdown() throws LifecycleException {
        this.lock.writeLock().lock();
        try {
            this.reports.clear();
        } finally {
            this.lock.writeLock().unlock();
        }
    }

}