Source Code Cross Referenced for CompressSpacePageOperation.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » store » raw » data » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.store.raw.data 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.store.raw.data.ChainAllocPageOperation
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to you under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.impl.store.raw.data;
023:
024:        import org.apache.derby.impl.store.raw.data.PhysicalPageOperation;
025:        import org.apache.derby.impl.store.raw.data.BasePage;
026:
027:        import org.apache.derby.iapi.services.io.FormatIdUtil;
028:        import org.apache.derby.iapi.services.io.StoredFormatIds;
029:        import org.apache.derby.iapi.services.sanity.SanityManager;
030:
031:        import org.apache.derby.iapi.error.StandardException;
032:        import org.apache.derby.iapi.store.raw.ContainerHandle;
033:        import org.apache.derby.iapi.store.raw.data.RawContainerHandle;
034:        import org.apache.derby.iapi.store.raw.Transaction;
035:        import org.apache.derby.iapi.store.raw.log.LogInstant;
036:
037:        import org.apache.derby.iapi.services.io.CompressedNumber;
038:
039:        import java.io.OutputStream;
040:        import java.io.ObjectOutput;
041:        import java.io.IOException;
042:        import org.apache.derby.iapi.services.io.LimitObjectInput;
043:        import java.io.ObjectInput;
044:
045:        /**
046:
047:         Log operation to implement compressing space from a container and returning
048:         it to the operating system.
049:
050:         **/
051:
052:        public final class CompressSpacePageOperation extends
053:                PhysicalPageOperation {
054:            /**************************************************************************
055:             * Fields of the class
056:             **************************************************************************
057:             */
058:
059:            /**
060:             * The new highest page on this allocation page.  The number is the
061:             * offset of the page in the array of pages maintained by this 
062:             * allocation page, for instance a value of 0 indicates all page except
063:             * the first one are to be truncated.  If all pages are truncated then 
064:             * the offset is set to -1.
065:             **/
066:            protected int newHighestPage;
067:
068:            /**
069:             * The number of allocated pages in this allocation page prior to 
070:             * the truncate.  Note that all pages from NewHighestPage+1 through
071:             * newHighestPage+num_pages_truncated should be FREE.
072:             **/
073:            protected int num_pages_truncated;
074:
075:            /**************************************************************************
076:             * Constructors for This class:
077:             **************************************************************************
078:             */
079:            public CompressSpacePageOperation(AllocPage allocPage,
080:                    int highest_page, int num_truncated)
081:                    throws StandardException {
082:                super (allocPage);
083:
084:                newHighestPage = highest_page;
085:                num_pages_truncated = num_truncated;
086:            }
087:
088:            /**************************************************************************
089:             * Public Methods of Formatable interface.
090:             **************************************************************************
091:             */
092:
093:            // no-arg constructor, required by Formatable 
094:            public CompressSpacePageOperation() {
095:                super ();
096:            }
097:
098:            public void writeExternal(ObjectOutput out) throws IOException {
099:                super .writeExternal(out);
100:                CompressedNumber.writeInt(out, newHighestPage);
101:                CompressedNumber.writeInt(out, num_pages_truncated);
102:            }
103:
104:            /**
105:            	@exception IOException error reading from log stream
106:            	@exception ClassNotFoundException cannot read object from input
107:             */
108:            public void readExternal(ObjectInput in) throws IOException,
109:                    ClassNotFoundException {
110:                super .readExternal(in);
111:                newHighestPage = CompressedNumber.readInt(in);
112:                num_pages_truncated = CompressedNumber.readInt(in);
113:            }
114:
115:            /**
116:            	Return my format identifier.
117:             */
118:            public int getTypeFormatId() {
119:                return StoredFormatIds.LOGOP_COMPRESS_SPACE;
120:            }
121:
122:            /**************************************************************************
123:             * Public Methods of Loggable interface.
124:             **************************************************************************
125:             */
126:
127:            /**
128:             * Compress space from container.
129:             * <p>
130:             * Compress the indicate space from the container, returning the free
131:             * pages to the OS.  Update the allocation page to reflect the file
132:             * change.
133:             *
134:             * @param tran      transaction doing the operation.
135:             * @param instant   log instant for this operation.
136:             * @param in        unused by this log operation.
137:             *
138:             * @exception  StandardException  Standard exception policy.
139:             **/
140:            public final void doMe(Transaction tran, LogInstant instant,
141:                    LimitObjectInput in) throws StandardException {
142:                if (SanityManager.DEBUG) {
143:                    SanityManager.ASSERT(this .page instanceof  AllocPage);
144:                }
145:
146:                ((AllocPage) page).compressSpace(instant, newHighestPage,
147:                        num_pages_truncated);
148:            }
149:
150:            /**************************************************************************
151:             * Public Methods of Undoable interface.
152:             **************************************************************************
153:             */
154:
155:            /**
156:             * Compress space undo.
157:             * <p>
158:             *
159:             * @exception StandardException Thrown by methods I call 
160:             * @see PhysicalPageOperation#undoMe
161:             **/
162:            public void undoMe(Transaction xact, BasePage undoPage,
163:                    LogInstant CLRInstant, LimitObjectInput in)
164:                    throws StandardException {
165:                if (SanityManager.DEBUG) {
166:                    SanityManager.ASSERT(undoPage != null, "undo Page null");
167:                    SanityManager.ASSERT(undoPage instanceof  AllocPage,
168:                            "undo Page is not an allocPage");
169:                }
170:
171:                ((AllocPage) undoPage).undoCompressSpace(CLRInstant,
172:                        newHighestPage, num_pages_truncated);
173:            }
174:
175:            /*
176:             * method to support BeforeImageLogging
177:             */
178:            public void restoreMe(Transaction xact, BasePage undoPage,
179:                    LogInstant CLRinstant, LimitObjectInput in) {
180:                // nobody should be calling this since there is no corresponding 
181:                // BI operation.
182:                if (SanityManager.DEBUG)
183:                    SanityManager
184:                            .THROWASSERT("cannot call restoreMe on CompressSpaceOperation.");
185:            }
186:
187:            /** debug */
188:            public String toString() {
189:                if (SanityManager.DEBUG) {
190:                    String str = super .toString();
191:                    str += " CompressSpaceOperation: " + "newHighestPage = "
192:                            + newHighestPage + ";num_pages_truncated = "
193:                            + num_pages_truncated + " to " + getPageId();
194:
195:                    return str;
196:                } else
197:                    return null;
198:            }
199:        }
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