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Core base classes for CAMP server implementation
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.brooklyn.camp;

import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.brooklyn.camp.spi.ApplicationComponent;
import org.apache.brooklyn.camp.spi.ApplicationComponentTemplate;
import org.apache.brooklyn.camp.spi.Assembly;
import org.apache.brooklyn.camp.spi.AssemblyTemplate;
import org.apache.brooklyn.camp.spi.PlatformComponent;
import org.apache.brooklyn.camp.spi.PlatformComponentTemplate;
import org.apache.brooklyn.camp.spi.PlatformRootSummary;
import org.apache.brooklyn.camp.spi.PlatformTransaction;
import org.apache.brooklyn.camp.spi.collection.BasicResourceLookup;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** A {@link CampPlatform} implementation which is empty but allows adding new items */
public class BasicCampPlatform extends CampPlatform {

    private static final Logger log = LoggerFactory.getLogger(BasicCampPlatform.class);
    
    public BasicCampPlatform() {
        this(PlatformRootSummary.builder().name("CAMP Platform").build());
    }
    
    public BasicCampPlatform(PlatformRootSummary root) {
        super(root);
    }

    BasicResourceLookup platformComponentTemplates = new BasicResourceLookup();
    BasicResourceLookup applicationComponentTemplates = new BasicResourceLookup();
    BasicResourceLookup assemblyTemplates = new BasicResourceLookup();

    BasicResourceLookup platformComponents = new BasicResourceLookup();
    BasicResourceLookup applicationComponents = new BasicResourceLookup();
    BasicResourceLookup assemblies = new BasicResourceLookup();

    @Override
    public BasicResourceLookup platformComponentTemplates() {
        return platformComponentTemplates;
    }

    @Override
    public BasicResourceLookup applicationComponentTemplates() {
        return applicationComponentTemplates;
    }

    @Override
    public BasicResourceLookup assemblyTemplates() {
        return assemblyTemplates;
    }
    
    @Override
    public BasicResourceLookup platformComponents() {
        return platformComponents;
    }

    @Override
    public BasicResourceLookup applicationComponents() {
        return applicationComponents;
    }

    @Override
    public BasicResourceLookup assemblies() {
        return assemblies;
    }
    
    @Override
    public PlatformTransaction transaction() {
        return new BasicPlatformTransaction(this);
    }
    
    public static class BasicPlatformTransaction extends PlatformTransaction {
        private final BasicCampPlatform platform;
        private final AtomicBoolean committed = new AtomicBoolean(false);
        
        public BasicPlatformTransaction(BasicCampPlatform platform) {
            this.platform = platform;
        }
        
        @Override
        public void commit() {
            if (committed.getAndSet(true)) 
                throw new IllegalStateException("transaction being committed multiple times");
            
            for (Object o: additions) {
                if (o instanceof AssemblyTemplate) {
                    platform.assemblyTemplates.add((AssemblyTemplate) o);
                    continue;
                }
                if (o instanceof PlatformComponentTemplate) {
                    platform.platformComponentTemplates.add((PlatformComponentTemplate) o);
                    continue;
                }
                if (o instanceof ApplicationComponentTemplate) {
                    platform.applicationComponentTemplates.add((ApplicationComponentTemplate) o);
                    continue;
                }
                
                if (o instanceof Assembly) {
                    platform.assemblies.add((Assembly) o);
                    continue;
                }
                if (o instanceof PlatformComponent) {
                    platform.platformComponents.add((PlatformComponent) o);
                    continue;
                }
                if (o instanceof ApplicationComponent) {
                    platform.applicationComponents.add((ApplicationComponent) o);
                    continue;
                }

                throw new UnsupportedOperationException("Object "+o+" of type "+o.getClass()+" cannot be added to "+platform);
            }
        }
        
        @Override
        protected void finalize() throws Throwable {
            if (!committed.get()) {
                // normal, in the case of errors (which might occur when catalog tries to figure out the right plan format); shouldn't happen otherwise
                // if we want log.warn visibility of these, then we will have to supply an abandon() method on this interface and ensure that is invoked on errors
                log.debug("Transaction "+this+" was never applied (normal when attempting to auto-detect plan formats)");
            }
            super.finalize();
        }
    }
    
}