@Override
public long allocatePages(long pageCount) throws IOException {
if (pageCount <= 0) {
return 0;
}
Stats stats = new Stats();
mPageManager.addTo(stats);
pageCount -= stats.freePages;
if (pageCount <= 0) {
return 0;
}
for (int i = 0; i < pageCount; i++) {
CommitLock.Shared shared = mCommitLock.acquireShared();
try {
mPageManager.allocAndRecyclePage();
} catch (Throwable e) {
throw closeOnFailure(e);
} finally {
shared.release();
}
}
return pageCount;
}
@Override
public void compactionReclaim() throws IOException {
try {
mPageManager.compactionReclaim();
} catch (Throwable e) {
throw closeOnFailure(e);
}
}
@Override
public boolean compactionEnd() throws IOException {
try {
return mPageManager.compactionEnd(mCommitLock);
} catch (Throwable e) {
throw closeOnFailure(e);
}
}
@Override
public void recyclePage(long id) throws IOException {
checkId(id);
CommitLock.Shared shared = mCommitLock.acquireShared();
try {
try {
mPageManager.recyclePage(id);
} catch (IOException e) {
mPageManager.deletePage(id);
}
} catch (IOException e) {
throw e;
} catch (Throwable e) {
throw closeOnFailure(e);
} finally {
shared.release();
}
}
@Override
public boolean compactionStart(long targetPageCount) throws IOException {
mCommitLock.acquireExclusive();
try {
return mPageManager.compactionStart(targetPageCount);
} catch (Throwable e) {
throw closeOnFailure(e);
} finally {
mCommitLock.releaseExclusive();
}
}
@Override
public void commit(boolean resume, long header, final CommitCallback callback)
throws IOException {
// Acquire a shared lock to prevent concurrent commits after callback has released
// exclusive lock.
CommitLock.Shared shared = mCommitLock.acquireShared();
try {
mHeaderLatch.acquireShared();
final int commitNumber = mCommitNumber + 1;
mHeaderLatch.releaseShared();
try {
if (!resume) {
mPageManager.commitStart(header, I_MANAGER_HEADER);
}
if (callback != null) {
// Invoke the callback to ensure all dirty pages get written.
callback.prepare(resume, header);
}
} catch (DatabaseException e) {
if (e.isRecoverable()) {
throw e;
} else {
throw closeOnFailure(e);
}
}
try {
commitHeader(header, commitNumber);
mPageManager.commitEnd(header, I_MANAGER_HEADER);
} catch (Throwable e) {
throw closeOnFailure(e);
}
} finally {
shared.release();
}
}
@Override
public long allocPage() throws IOException {
CommitLock.Shared shared = mCommitLock.acquireShared();
try {
return mPageManager.allocPage();
} catch (DatabaseException e) {
if (e.isRecoverable()) {
throw e;
}
throw closeOnFailure(e);
} catch (Throwable e) {
throw closeOnFailure(e);
} finally {
shared.release();
}
}
@Override
public boolean truncatePages() throws IOException {
return mPageManager.truncatePages();
}
@Override
public boolean compactionVerify() throws IOException {
// Only performs reads and so no commit lock is required. Holding it would block
// checkpoints during reserve list scan, which is not desirable.
return mPageManager.compactionVerify();
}
@Override
public Stats stats() {
Stats stats = new Stats();
mPageManager.addTo(stats);
return stats;
}
@Override
public void pageLimitOverride(long bytes) {
mPageManager.pageLimitOverride(bytes);
}
@Override
public long pageLimit() {
return mPageManager.pageLimit();
}
@Override
public void pageLimit(long limit) {
mPageManager.pageLimit(limit);
}
/** Must be called when object is no longer referenced. */
@Override
void delete() {
if (mPageManager != null) {
mPageManager.delete();
}
}
