ca.uhn.fhir.rest.server.FifoMemoryPagingProvider.java Source code

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Here is the source code for ca.uhn.fhir.rest.server.FifoMemoryPagingProvider.java

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package ca.uhn.fhir.rest.server;

/*
 * #%L
 * HAPI FHIR - Core Library
 * %%
 * Copyright (C) 2014 - 2016 University Health Network
 * %%
 * 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.
 * #L%
 */

import java.util.LinkedHashMap;
import java.util.UUID;

import org.apache.commons.lang3.Validate;

public class FifoMemoryPagingProvider implements IPagingProvider {

    private LinkedHashMap<String, IBundleProvider> myBundleProviders;
    private int myDefaultPageSize = 10;
    private int myMaximumPageSize = 50;
    private int mySize;

    public FifoMemoryPagingProvider(int theSize) {
        Validate.isTrue(theSize > 0, "theSize must be greater than 0");

        mySize = theSize;
        myBundleProviders = new LinkedHashMap<String, IBundleProvider>(mySize);
    }

    @Override
    public int getDefaultPageSize() {
        return myDefaultPageSize;
    }

    @Override
    public int getMaximumPageSize() {
        return myMaximumPageSize;
    }

    @Override
    public synchronized IBundleProvider retrieveResultList(String theId) {
        return myBundleProviders.get(theId);
    }

    public FifoMemoryPagingProvider setDefaultPageSize(int theDefaultPageSize) {
        Validate.isTrue(theDefaultPageSize > 0, "size must be greater than 0");
        myDefaultPageSize = theDefaultPageSize;
        return this;
    }

    public FifoMemoryPagingProvider setMaximumPageSize(int theMaximumPageSize) {
        Validate.isTrue(theMaximumPageSize > 0, "size must be greater than 0");
        myMaximumPageSize = theMaximumPageSize;
        return this;
    }

    @Override
    public synchronized String storeResultList(IBundleProvider theList) {
        while (myBundleProviders.size() > mySize) {
            myBundleProviders.remove(myBundleProviders.keySet().iterator().next());
        }

        String key = UUID.randomUUID().toString();
        myBundleProviders.put(key, theList);
        return key;
    }

}