Examples of org.jgroups.util.Headers

org.jgroups.util.Headers
Open addressing based implementation of a hashmap (not supporting the Map interface though) for message headers. The keys are shorts (IDs) and the values Headers, and they're stored in 2 arrays: an ID array and a headers array. The indices of the IDs array corespond with the headers array, e.g.
```
 IDs:      id-1  | id-2  | id-3  | ... | id-n | Headers:  hdr-1 | hdr-2 | hdr-3 | ... | hdr-n | 
```
The arrays are populated from left to right, and any 0 slots in 'ids' can terminate an interation, or signal empty slots.
It is assumed that we only have a few headers, 3-4 on average. Note that getting a header for a given key and putting a new key/header are operations with O(n) cost, so this implementation is not recommended for a large number of elements.
This class is not synchronized @author Bela Ban

        }
        return hdr;
    }


    private static Headers createHeaders(int size) {
        return size > 0? new Headers(size) : new Headers(3);
    }

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        return size > 0? new Headers(size) : new Headers(3);
    }




    private static Headers createHeaders(Headers m) {
        return new Headers(m);
    }

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    private static final MyHeader h1=new MyHeader(), h2=new MyHeader(), h3=new MyHeader();






    public static void testConstructor() {
        Headers hdrs=new Headers(5);
        System.out.println("hdrs = " + hdrs);
        assert hdrs.capacity() == 5 : "capacity must be 5 but was " + hdrs.capacity();
        short[] ids=hdrs.getRawIDs();
        assert ids.length == hdrs.capacity();
        Header[] headers=hdrs.getRawHeaders();
        assert headers.length == hdrs.capacity();
        assert hdrs.size() == 0;
    }

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        assert hdrs.size() == 0;
    }




    public static void testContructor2() {
        Headers old=createHeaders(3);


        Headers hdrs=new Headers(old);
        System.out.println("hdrs = " + hdrs);
        assert hdrs.capacity() == 3 : "capacity must be 3 but was " + hdrs.capacity();


        short[] ids=hdrs.getRawIDs();
        Header[] headers=hdrs.getRawHeaders();


        assert ids.length == hdrs.capacity();
        assert headers.length == hdrs.capacity();


        assert hdrs.size() == 3;


        // make sure 'hdrs' is not changed when 'old' is modified, as 'hdrs' is a copy
        old.putHeader((short)300, new MyHeader());
        assert hdrs.capacity() == 3 : "capacity must be 3 but was " + hdrs.capacity();


        assert ids.length == hdrs.capacity();
        assert headers.length == hdrs.capacity();


        assert hdrs.size() == 3;
    }

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        assert hdrs.size() == 3;
    }




    public static void testGetRawData() {
        Headers hdrs=createHeaders(3);


        short[] ids=hdrs.getRawIDs();
        Header[] headers=hdrs.getRawHeaders();


        assert ids.length == 3;
        assert headers.length == 3;


        assert ids[0] == NAKACK_ID;
        assert headers[0] == h1;


        assert ids[1] == FRAG_ID;
        assert headers[1] == h2;


        assert ids[2] == UDP_ID;
        assert headers[2] == h3;


        assert ids.length == hdrs.capacity();
        assert headers.length == hdrs.capacity();


        assert hdrs.size() == 3;
    }

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        assert hdrs.size() == 3;
    }




    public static void testGetHeaders() {
        Headers hdrs=createHeaders(3);
        Map<Short, Header> map=hdrs.getHeaders();
        System.out.println("map = " + map);
        assert map != null && map.size() == 3;
        assert map.get(NAKACK_ID) == h1;
        assert map.get(FRAG_ID) == h2;
        assert map.get(UDP_ID) == h3;

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        assert map.get(FRAG_ID) == h2;
        assert map.get(UDP_ID) == h3;
    }


    public static void testSize() {
        Headers hdrs=createHeaders(3);
        assert hdrs.size() == 3;
    }

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        assert hdrs.size() == 3;
    }




    private static Headers createHeaders(int initial_capacity) {
        Headers hdrs=new Headers(initial_capacity);
        hdrs.putHeader(NAKACK_ID,  h1);
        hdrs.putHeader(FRAG_ID, h2);
        hdrs.putHeader(UDP_ID, h3);
        return hdrs;
    }

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        return hdrs;
    }




    public static void testPutHeader() {
        Headers hdrs=createHeaders(3);
        assert hdrs.getHeader(NAKACK_ID) == h1;
        hdrs.putHeader(NAKACK_ID, new MyHeader());
        assert hdrs.size() == 3;
        assert hdrs.getHeader(NAKACK_ID) != h1;
        assert hdrs.capacity() == 3;


        hdrs.putHeader((short)400, new MyHeader());
        assert hdrs.size() == 4;
        assert hdrs.capacity() > 3;
    }

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        assert hdrs.capacity() > 3;
    }




    public static void testPutHeaderIfAbsent() {
        Headers hdrs=createHeaders(3);
        Header hdr=hdrs.putHeaderIfAbsent(FRAG_ID, new MyHeader());
        assert hdr == h2;
        assert hdr == hdrs.getHeader(FRAG_ID);
        assert hdrs.size() == 3;
        assert hdrs.capacity() == 3;


        hdr=hdrs.putHeaderIfAbsent((short)400, new MyHeader());
        System.out.println("hdrs = " + hdrs);
        assert hdr == null;
        assert hdrs.size() == 4;
        assert hdrs.capacity() == 6;


        hdrs.putHeader(FRAG_ID,null);
        assert hdrs.getHeader(FRAG_ID) == null;
        MyHeader myhdr=new MyHeader();
        hdr=hdrs.putHeaderIfAbsent(FRAG_ID, myhdr);
        assert hdr == null;
        assert hdrs.getHeader(FRAG_ID) == myhdr;
    }

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Related Classes of org.jgroups.util.Headers

org.jgroups.Header

org.jgroups.Message

org.jgroups.tests.HeadersTest

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