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

        assert hdr == null;
        assert hdrs.getHeader(FRAG_ID) == myhdr;
    }


    public static void testGetHeader() {
        Headers hdrs=createHeaders(3);
        assert null == hdrs.getHeader((short)400);
        assert hdrs.getHeader(UDP_ID) == h3;
    }

        assert hdrs.getHeader(UDP_ID) == h3;
    }




    public static void testResize() {
        Headers hdrs=createHeaders(3);
        int capacity=hdrs.capacity();
        System.out.println("hdrs = " + hdrs + ", capacity=" + capacity);


        hdrs.putHeader((short)400, new MyHeader());
        System.out.println("hdrs = " + hdrs + ", capacity=" + hdrs.capacity());
        assert hdrs.capacity() > capacity;


        capacity=hdrs.capacity();
        for(int i=10; i <= 13; i++)
            hdrs.putHeader((short)i, new MyHeader());
        System.out.println("hdrs = " + hdrs + ", capacity=" + hdrs.capacity());
        assert hdrs.capacity() > capacity;
    }

Examples of org.jgroups.util.Headers

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